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(SPONSORED CONTENT)Gear Grinding with Closed Loop: The Next Level
Gleason Genesis® GX Series Threaded Wheel Grinding Machines take high-volume, high-quality gear finishing to a new level, with features like single-tool setup, twist-controlled grinding and integrated automation. Our Closed Loop System networks a Gleason GMS inspection machine directly to the GX for fast, reliable, automatic data transfer and corrections. Article Courtesy of Gleason Corporation
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Excessive machine tool vibration during a precision grinding operation can result in poor workpiece quality in the form of chatter, rough finishes, burn, etc. One possible reason for excessive vibration is directly associated with the relationship between natural frequencies of a machine tool system and the operating speed of the grinding wheel spindle.
Power train designs which employ gears with cone angles of approximately 2 degrees to 5 degrees have become quite common. It is difficult, if not impossible, to grind these gears on conventional bevel gear grinding machines. Cylindrical gear grinding machines are better suited for this task. This article will provide an overview of this option and briefly introduce four grinding variation possibilities.
In the quest for ever more exacting and compact commercial gears, precision abrasives are playing a key production role - a role that can shorten cycle time, reduce machining costs and meet growing market demand for such requirements as light weights, high loads, high speed and quiet operation. Used in conjunction with high-quality grinding machines, abrasives can deliver a level of accuracy unmatched by other manufacturing techniques, cost-effectively meeting AGMA gear quality levels in the 12 to 15 range. Thanks to advances in grinding and abrasive technology, machining has become one of the most viable means to grind fast, strong and quiet gears.
Gear grinding is one of the most expensive and least understood aspects of gear manufacturing. But with pressures for reduced noise, higher quality and greater efficiency, gear grinding appears to be on the rise.
It isn't for everyone, but... Within the installed base of modern CNC gear profile grinding machines (approximately 542 machines worldwide), grinding from the solid isn't frequent, but a growing number of gear profile grinder users are applying it successfully using CBN-plated wheels.
Because of the better thermal conductivity of CBN abrasives compared to that of conventional aluminum oxide wheels, CBN grinding process, which induces residual compressive stresses into the component, and possibly improves the subsequent stress behavior. This thesis is the subject of much discussion. In particular, recent Japanese publications claim great advantages for the process with regard to an increased component load capacity, but do not provide further details regarding the technology, test procedures or components investigated. This situation needs clarification, and for the this reason the effect of the CBN grinding material on the wear behavior and tooth face load capacity of continuously generated ground gears was further investigated.
New freedom of motion available with CNC generators make possible improving tooth contact on bevel and hypoid gears. Mechanical machines by their nature are inflexible and require a special mechanism for every desired motion. These mechanisms are generally exotic and expensive. As a result, it was not until the introduction of CNC generators that engineers started exploring motion possibilities and their effect on tooth contact.
New divisions, open houses and the continued rise of the Industrial Internet of Things - There's been a lot going on in gear grinding in the past year.
Modern manufacturing processes have become an ally of the product designer in producing higher quality, higher performing components in the transportation industry. This is particularly true in grinding systems where the physical properties of CBN abrasives have been applied to improving cycle times, dimensional consistency, surface integrity and overall costs. Of these four factors, surface integrity offers the greatest potential for influencing the actual design of highly stressed, hardened steel components.
The merits of CBN physical characteristics over conventional aluminum oxide abrasives in grinding performance are reviewed. Improved surface integrity and consistency in drive train products can be achieved by the high removal rate of the CBN grinding process. The influence of CBN wheel surface conditioning procedure on grinding performance is also discussed.
The quality of a gear and its performance is determined by the following five parameters, which should be specified for each gear: Pitch diameter, involute form, lead accuracy, spacing accuracy, and true axis of rotation. The first four parameters can be measured or charted and have to be within tolerance with respect to the fifth. Pitch diameter, involute, lead, and spacing of a gear can have master gear quality when measured or charted on a testing machine, but the gear might perform badly if the true axis of rotation after installation is no longer the same one used when testing the gear.
Grinding is a technique of finish-machining, utilizing an abrasive wheel. The rotating abrasive wheel, which id generally of special shape or form, when made to bear against a cylindrical shaped workpiece, under a set of specific geometrical relationships, will produce a precision spur or helical gear. In most instances the workpiece will already have gear teeth cut on it by a primary process, such as hobbing or shaping. There are essentially two techniques for grinding gears: form and generation. The basic principles of these techniques, with their advantages and disadvantages, are presented in this section.
Grinding in one form or another has been used for more than 50 years to correct distortions in gears caused by the high temperatures and quenching techniques associated with hardening. Grinding improves the lead, involute and spacing characteristics. This makes the gear capable of carrying the high loads and running at the high pitch line velocities required by today's most demanding applications. Gears that must meet or exceed the accuracy requirements specified by AGMA Quality 10-11 or DIN Class 6-7 must be ground or hard finished after hear treatment.
The grinding of gears with dish wheels (Maad type grinding machines) is widely viewed as the most precise method of gear grinding because of the very short and simple kinematic links between the gear and the tool, and also because the cutting edges of the wheels represent planar surfaces. However, in this grinding method, depending on the parameters of the gears and one of the adjustments (such as the number of teeth encompassed by the grinding wheels), so-called overtravel at the tip or at the root of the teeth being ground generally occurs. When this happens, machining with only one wheel takes place. As a result, the profile error and the length of the generating path increases while productivity decreases.
Liebherr is well-known as one of the world’s largest privately owned companies — a titan in heavy industry specializing in cranes, trucks and mammoth earth moving and mining equipment.
Whether you spent time at Gear Expo in Indianapolis or EMO in Hannover, there was certainly new technology attracting attention. Machine tools are faster, more efficient and can integrate numerous functions in a single setup. Grinding technology is turning science upside down and inside out with high-speed removal rates and increased throughput.
When Dr. Hermann J. Stadtfeld speaks, people tend to listen. Considered one of the world’s foremost experts on bevel gears, Stadtfeld, the vice president of bevel gear technology at Gleason, recently revealed several cutting-edge advancements that the company has been working on.
One process for hard finishing gears is generating gear grinding. Due to its high process efficiency, generating gear grinding has replaced other grinding processes such as profile grinding in batch production of small- and middle-sized gears. Yet despite the wide industrial application of generating gear grinding, the process design is based on experience along with time- and cost-intensive trials. The science-based analysis of generating gear grinding demands a high amount of time and effort, and only a few published scientific analyses exist. In this report a thermo-mechanical process model that describes influences on the surface zone in generating gear grinding is introduced.
The hobbing and generation grinding production processes are complex due to tool geometry and kinematics. Expert knowledge and extensive testing are required for a clear attribution of cause to work piece deviations. A newly developed software tool now makes it possible to simulate the cutting procedure of the tool and superimpose systematic deviations on it. The performance of the simulation software is illustrated here with practical examples. The new simulation tool allows the user to accurately predict the effect of errors. With this knowledge, the user can design and operate optimal, robust gearing processes.
Generating gear grinding is one of the most important finishing processes for small and medium-sized gears, its process design often determined by practical knowledge. Therefore a manufacturing simulation with the capability to calculate key values for the process — such as the specific material removal rate — is developed here. Indeed, this paper presents first results of a model for a local analysis of the value. Additionally, an empirical formula — based on a multiple regression model for a global value describing the process — is provided.
Looking for some simple yet useful advice heading into IMTS 2016? Never second guess your machine tool investment. Flexibility is a mandatory requirement in gear manufacturing today. Accuracy, reliability and efficiency must improve with each new machine tool purchase. Innovation is always the end game. So it comes as no surprise that IMTS 2016 attendees will have plenty of gear grinding technologies to consider this fall.
When hardened steel components are ground, there is always the possibility of damage to the steel in the form of residual stress or microstructural changes. Methods for detecting this sort of damage have always had one or more drawbacks, such as cost, time, complexity, subjectivity, or the use of hazardous chemicals.
The goal of gear drive design is to transit power and motion with constant angular velocity. Current trends in gear drive design require greater load carrying capacity and increased service life in smaller, quieter, more efficient gearboxes. Generally, these goals are met by specifying more accurate gears. This, combined with the availability of user-friendly CNC gear grinding equipment, has increased the use of ground gears.
In comparison to the visionary Industry 4.0 — or the Fourth Industrial Revolution — the machine tool industry can appear rather down-to-earth.
The latest machines, tooling and technology for gear grinding were featured at IMTS 2012.
This machine concept facilitates highly productive profile grinding for large workpieces. The range for external and internal gears comprises models for manufacturing workpieces up to 2,000 millimeters – for industrial gear units, wind power, and marine propulsion applications
This paper introduces the latest process developments for the hard-finishing of gears, specifically in regard to controlling the so-called flank twist.
This article deals with certain item to be taken into consideration for gear grinding, common problems that arise in gear grinding and their solutions. The discussion will be limited to jobbing or low-batch production environments, where experimental setup and testing is not possible for economic and other reasons.
The benefits of ground gears are well known. They create less noise, transmit more power and have longer lives than non-ground gears. But grinding has always been thought of as an expensive process, one that was necessary only for aerospace or other high-tech gear manufacturing.
The GS:TE-LM thread grinder from Drake Manufacturing is fitted with a robot load/unload system that provides maximum throughput for high-volume production of ground threads.
In conventional gear grinders, grinding wheels with Alundum grains and a hardness of about 2000 HV have been used for finishing steel gears with hardnesses up to about 1000HV. In this case, the accuracy of the gears ground is greatly affected by wear of the grinding wheel because the difference in hardness is comparatively small when the gears are fully hardened.
In order to grind gears burn-free and as productively as possible, a better understanding of the process is required.
Tom Lang of Kapp Technologies shares his views on the trends affecting ground gears.
New machine promises DIN 2 accuracy and unique features at low cost.
The bevel gear grinding process, with conventional wheels, has been limited to applications where the highest level of quality is required.
Instances of damage to discontinuous form ground and surface-hardened gears, especially of large scale, have recently increased. This may be attributed partly to a faulty grinding process with negative effects on the surface zones and the surface properties.
When gears are case-hardened, it is known that some growth and redistribution of stresses that result in geometric distortion will occur. Aerospace gears require post case-hardening grinding of the gear teeth to achieve necessary accuracy. Tempering of the case-hardened surface, commonly known as grinding burn, occurs in the manufacturing process when control of the heat generation at the surface is lost.
Recent breakthroughs in profile grinding software are helping Anderson Precision Gears and others meet wind power’s insatiable appetite for faster production of large, high-quality gears.
When you push 850 horsepower and 9,000 rpm through a racing transmission, you better hope it stands up. Transmission cases and gears strewn all over the racetrack do nothing to enhance your standing, nor that of your transmission supplier.
Flexibility and productivity are the keywords in today’s grinding operations. Machines are becoming more flexible as manufacturers look for ways to produce more parts at a lower cost. What used to take two machines or more now takes just one.
The fundamental purpose of gear grinding is to consistently and economically produce "hard" or "soft" gear tooth elements within the accuracy required by the gear functions. These gear elements include tooth profile, tooth spacing, lead or parallelism, axial profile, pitch line runout, surface finish, root fillet profile, and other gear geometry which contribute to the performance of a gear train.
This paper presents the results of a study performed to measure the change in residual stress that results from the finish grinding of carburized gears. Residual stresses were measured in five gears using the x-ray diffraction equipment in the Large Specimen Residual Stress Facility at Oak Ridge National Laboratory.
Guidelines are insurance against mistakes in the often detailed work of gear manufacturing. Gear engineers, after all, can't know all the steps for all the processes used in their factories.
Borazon is a superabrasive material originally developed by General Electric in 1969. It is a high performance material for machining of high alloy ferrous and super alloy materials. Borazon CBN - Cubic Born Nitride - is manufactured with a high temperature, high pressure process similar to that utilized with man-made diamond. Borazon is, next to diamond, the hardest abrasive known; it is more than twice as hard as aluminum oxide. It has an extremely high thermal strength compared to diamond. It is also much less chemically reactive with iron, cobalt or nickel alloys.
This article shows the newest developments to reduce overall cycle time in grinding wind power gears, including the use of both profile grinding and threaded wheel grinding.
A considerable improvement in the performance of the machining of hard to grind materials can be achieved by means of CBN wheels.
Until recently, form gear grinding was conducted almost exclusively with dressable, conventional abrasive grinding wheels. In recent years, preformed, plated Cubic Boron Nitride (CBN) wheels have been introduced to this operation and a considerable amount of literature has been published that claim that conventional grinding wheels will be completely replaced in the future. The superior machining properties of the CBN wheel are not disputed in this paper.
Bevel gear manufacturers live in one of two camps: the face hobbing/lapping camp, and the face milling/grinding camp.
Machine tool companies are expanding capabilities to better accommodate the changing face of manufacturing. Customers want smaller-sized equipment to take up less valuable floor space, multifunctional machines that can handle a variety of operations and easy set-up changes that offer simplified operation and maintenance.
Hofler Rapid 6000 Makes North American Debut at Highway Machine Company.
Modern gearboxes are characterized by high torque load demands, low running noise and compact design. In order to fulfill these demands, profile and lead modifications are being applied more often than in the past. This paper will focus on how to produce profile and lead modifications by using the two most common grinding processes—threaded wheel and profile grinding. In addition, more difficult modifications—such as defined flank twist or topological flank corrections—will also be described in this paper.
This paper acknowledges the wide variety of manufacturing processes--especially in grinding--utlized in the production of bevel gears...
This paper intends to determine the load-carrying capacity of thermally damaged parts under rolling stress. Since inspection using real gears is problematic, rollers are chosen as an acceptable substitute. The examined scope of thermal damage from hard finishing extends from undamaged, best-case parts to a rehardening zone as the worst case. Also, two degrees of a tempered zone have been examined.
The essence of designing gears is often by necessity risk-averse, given that many of them are used in applications where loss of life is a distinct possibility. The Gear Research Institute (GRI) at The Pennsylvania State University conducts risk reduction testing with the same goal in mind - whether it be gears in fighter jets, Ferris wheels, tanks, or countless other gear-reliant vehicles and machinery.
In this special section, our editors have gathered recent news and information related to the heat treatment of gears. Here you’ll find a comprehensive assortment of news and upcoming events that will help you understand the various heat treatment processes available for gears and choose the best option for your projects, whether you heat treat in-house or send your gears to a commercial heat treating provider.
For maximum life in carburized and ground gearing, I have been advised that fully grinding a radius into the root gives maximum resistance against fatigue failures. Others have advised that a hobbed and unground radius root form is best. Which is best, and why?
The honing of gears - by definition - facilitates ease of operation, low noise and smoother performance in a transmission. Honing also contributes to reduced friction in the powertrain. Both the intense cutting (roughing process) as well as the functionally fine- finishing of transmission gears can be performed in one setup, on one machine.
Gear Technology interviews Scott Yoders of Liebherr about the latest gear machining technologies of relevance to automotive manufacturers.
News from around the Gear Industry
The complete Product News section from the August 2014 issue of Gear Technology.
A reader wants to know: Are profile ground and hobbed globoidal worm sets better than multi-axis CNC generated globoidal worm gear sets for reduction of noise and vibration?
In the design process of transmissions, one major criterion is the resulting noise emission of the powertrain due to gear excitation. Within the past years, much investigation has shown that the noise emission can be attributed to quasi-static transmission error. Therefore, the transmission error can be used for a tooth contact analysis in the design process, as well as a characteristic value for quality assurance by experimental inspections.
THE FINAL CHAPTER This is the last in the series of chapters excerpted from Dr. Hermann J. Stadtfeld’s Gleason Bevel Gear Technology — a book written for specialists in planning, engineering, gear design and manufacturing. The work also addresses the technical information needs of researchers, scientists and students who deal with the theory and practice of bevel gears and other angular gear systems. While all of the above groups are of course of invaluable importance to the gear industry, it is surely the students who hold the key to its future. And with that knowledge it is reassuring to hear from Dr. Stadtfeld of the enthusiastic response he has received from younger readers of these chapter installments.
Grinding of bevel and hypoid gears creates on the surface a roughness structure with lines that are parallel to the root. Imperfections of those lines often repeat on preceding teeth, leading to a magnification of the amplitudes above the tooth mesh frequency and their higher harmonics. This phenomenon is known in grinding and has led in many cylindrical gear applications to an additional finishing operation (honing). Until now, in bevel and hypoid gear grinding, a short time lapping of pinion and gear after the grinding operation, is the only possibility to change the surface structure from the strongly root line oriented roughness lines to a diffuse structure.
Ground bevel and hypoid gears have a designed motion error that defines parts of their NVH behavior. The surface structure is defined by the hard finishing process.
Could you explain to me the difference between spiral bevel gear process face hobbing-lapping, face milling-grinding and Klingelnberg HPG? Which one is better for noise, load capacity and quality?
Dressable vitrified bond CBN grinding tools combine the advantages of other common tool systems in generating gear grinding. Yet despite those technological advantages, there is only a small market distribution of these grinding tools due to high tool costs. Furthermore, scant literature exists regarding generating gear grinding with dressable CBN. This is especially true regarding the influence of the grinding tool system on manufacturing-related component properties. The research objective of this report is to determine the advantages of dressable CBN tools in generating gear grinding.
After shaping or hobbing, the tooth flanks must be either chamfered or duburred. Here it is paramount that the secondary burr produced will not be formed into the flank, but to the face of the gear, because during hardening, the secondary burr will straighten up and, due to its extreme hardness, will lead to excessive tool wear.
Analysis of helical involute gears by tooth contact analysis shows that such gears are very sensitive to angular misalignment leading to edge contact and the potential for high vibration. A new topology of tooth surfaces of helical gears that enables a favorable bearing contact and a reduced level of vibration is described. Methods for grinding helical gears with the new topology are proposed. A TCA program simulating the meshing and contact of helical gears with the new topology has been developed. Numerical examples that illustrate the proposed ideas are discussed.
When designing hardened and ground spur gears to operate with minimum noise, what are the parameters to be considered? should tip and/or root relief be applied to both wheel and pinion or only to one member? When pinions are enlarged and he wheel reduced, should tip relief be applied? What are the effects on strength, wear and noise? For given ratios with enlarged pinions and reduced wheels, how can the gear set sized be checked or adjusted to ensure that the best combination has been achieved?
For over 50 years, grinding has been an accepted method of choice for improving the quality of gears and other parts by correcting heat treat distortions. Gears with quality levels better than AGMA 10-11 or DIN 6-7 are hard finished, usually by grinding. Other applications for grinding include, but are not limited to, internal/external and spur/helical gear and spline forms, radius forms, threads and serrations, compressor rotors, gerotors, ball screw tracks, worms, linear ball tracks, rotary pistons, vane pump rotators, vane slots, and pump spindles.
Profitable hard machining of tooth flanks in mass production has now become possible thanks to a number of newly developed production methods. As used so far, the advantages of hard machining over green shaving or rolling are the elaborately modified tooth flanks are produced with a scatter of close manufacturing tolerances. Apart from an increase of load capacity, the chief aim is to solve the complex problem of reducing the noise generation by load-conditioned kinematic modifications of the tooth mesh. In Part II, we shall deal with operating sequences and machining results and with gear noise problems.
This article investigates fillet features consequent to tooth grinding by generating methods. Fillets resulting from tooth cutting and tooth grinding at different pressure angles and with different positions of grinding wheel are compared. Ways to improve the final fillet of the ground teeth with regard to tooth strength and noise, as well as the grinding conditions, are shown. "Undergrinding" is defined and special designs for noiseless gears are described.
The complete Industry News section from the July 2014 issue of Gear Technology.
Gear Technology was founded 22 years ago on a very simple principle: to provide the best possible educational articles and information for the gear industry.
Hard Gear Finishing (HGF), a relatively new technology, represents an advance in gear process engineering. The use of Computer Numerical Controlled (CNC) equipment ensures a high precision synchronous relationship between the tool spindle and the work spindle as well as other motions, thereby eliminating the need for gear trains. A hard gear finishing machine eliminates problems encountered in two conventional methods - gear shaving, which cannot completely correct gear errors in gear teeth, and gear rolling, which lacks the ability to remove stock and also drives the workpiece without a geared relationship to the master rolling gear. Such a machine provides greater accuracy, reducing the need for conventional gear crowning, which results in gears of greater face width than necessary.
An analysis of possibilities for the selection of tool geometry parameters was made in order to reduce tooth profile errors during the grinding of gears by different methods. The selection of parameters was based on the analysis of he grid diagram of a gear and a rack. Some formulas and graphs are presented for the selection of the pressure angle, module and addendum of the rack-tool. The results from the grinding experimental gears confirm the theoretical analysis.
This paper initially defines bias error—the “twisted tooth phenomenon.” Using illustrations, we explain that bias error is a by-product of applying conventional, radial crowning methods to produced crowned leads on helical gears. The methods considered are gears that are finished, shaped, shaved, form and generated ground. The paper explains why bias error occurs in these methods and offers techniques used to limit/eliminate bias error. Sometimes, there may be a possibility to apply two methods to eliminate bias error. In those cases, the pros/cons of these methods will be reviewed.
Previews of manufacturing technology related to gears that will be on display at IMTS 2012.
The grinding/abrasives market is rapidly changing, thanks to new technology, more flexibility and an attempt to lower customer costs. Productivity is at an all-time high in this market, and it’s only going to improve with further R&D. By the time IMTS 2014 rolls around this September, the gear market will have lots of new toys and gadgets to offer potential customers. If you haven’t upgraded any grinding/abrasives equipment in the last five years, now might be a good time to consider the investment.
Non-uniform gear wear changes gear topology and affects the noise performance of a hypoid gear set. The aggregate results under certain vehicle driving conditions could potentially result in unacceptable vehicle noise performance in a short period of time. This paper presents the effects of gear surface parameters on gear wear and the measurement/testing methods used to quantify the flank wear in laboratory tests.
Gleason 350GMS helps put higher quality, more reliable gears into its next-generation TC10 automatic transmission.
Every so often manufacturing is jolted out of its inertia by a transformative technology – one that fundamentally changes not only the way products are made, but also the economics of the business.
Cubitron II wheels are put to the test in this case study.
Much of the existing guidelines for making large, high-performance gears for wind turbine gearboxes exhibit a need for improvement. Consider: the large grinding stock used to compensate for heat treatment distortion can significantly reduce manufacturing productivity; and, materials and manufacturing processes are two other promising avenues to improvement. The work presented here investigates quenchable alloy steels that, combined with specifically developed Case-hardening and heat treatment processes, exhibits reduced distortion and, in turn, requires a smaller grinding stock.
The complete Product News section from the June/July 2013 issue of Gear Technology.
When a customer needed gears delivered in three weeks, here’s how Brevini Wind got it done.
For two days in Saline, Michigan, Liebherr's clients, customers and friends came together to discuss the latest gear products and technology. Peter Wiedemann, president of Liebherr Gear Technology Inc., along with Dr.-Ing. Alois Mundt, managing director, Dr.-Ing. Oliver Winkel, head of application technology, and Dr.-Ing. Andreas Mehr, technology development shaping and grinding, hosted a variety of informative presentations.
If you’ve got a gear performance problem, the Gear Research Institute (GRI) is here to help you. Since inception in 1982, GRI has been a primarily industry sponsored, experimentation driven research facility. Whether establishing the fatigue life of gears or evaluating the impact of manufacturing processes on the performance of gears, GRI has pioneered methods and procedures for characterizing such properties that are accepted by the aerospace, vehicle and other industry sectors.
In the wide, wide world of moving parts, the gears required for the big jobs—the really big jobs—often experience big problems. Proper lubrication of these gears is paramount in industrial applications such as wind turbines, kilns, sugar mills, crushers, heavy construction, offshore drilling rigs, mining and quarrying.
The quality of molded plastic gears is typically judged by dimensional feature measurements only. This practice overlooks potential deficiencies in the molding process.
Capacity is key today, and the best way to ensure that you are squeezing every dime out of that new machine is to complement it with innovative workholding.
Detection of impending gear tooth failure is of interest to every entity that utilizes geared transmissions. However, it is of particular significance at the Gear Research Institute (GRI), where sponsored efforts are conducted to establish gear material endurance limits, utilizing gear fatigue tests. Consequently, knowing when a gear is about to fail in each and every test, in a consistent manner, is essential for producing reliable and useful data for the gear industry.
Traditionally, high-quality gears are cut to shape from forged blanks. Great accuracy can be obtained through shaving and grinding of tooth forms, enhancing the power capacity, life and quietness of geared power transmissions. In the 1950s, a process was developed for forging gears with teeth that requires little or no metal to be removed to achieve final geometry. The initial process development was undertaken in Germany for the manufacture of bevel gears for automobile differentials and was stimulated by the lack of available gear cutting equipment at that time. Later attention has turned to the forging of spur and helical gears, which are more difficult to form due to the radial disposition of their teeth compared with bevel gears. The main driver of these developments, in common with most component manufacturing, is cost. Forming gears rather than cutting them results in increased yield from raw material and also can increase productivity. Forging gears is therefore of greater advantage for large batch quantities, such as required by the automotive industry.
In order to increase the load carrying capacity of hardened gears, the distortion of gear teeth caused by quenching must be removed by precision cutting (skiving) and/or grinding. In the case of large gears with large modules, skiving by a carbide hob is more economical than grinding when the highest accuracy is not required.
In the past, the blades of universal face hobbing cutters had to be resharpened on three faces. Those three faces formed the active part of the blade. In face hobbing, the effective cutting direction changes dramatically with respect to the shank of the blade. Depending on the individual ratio, it was found that optimal conditions for the chip removal action (side rake, side relief and hook angle) could just be established by adjusting all major parameters independently. This, in turn, results automatically in the need for the grinding or resharpening of the front face and the two relief surfaces in order to control side rake, hook angle and the relief and the relief angles of the cutting and clearance side.
I'm a big believer in the value of IMTS as a marketplace where gear manufacturers can go and look at the latest machine tools and processes; compare hobbing machines, gear grinders and inspection equipment; see turning, milling or grinding machines in action; and ask questions of the various vendors all in one place. This year's IMTS promised to be the biggest ever, and I have no doubt that it will be a valuable experience to those who go there looking for ways to improve the way they manufacture products.
In his Handbook of Gear Design (Ref.1), Dudley states (or understates): "The best gear people around the world are now coming to realize that metallurgical quality is just as important as geometric quality." Geometric accuracy without metallurgical integrity in any highly stressed gear or shaft would only result in wasted effort for all concerned - the gear designer, the manufacturer, and the customer - as the component's life cycle would be prematurely cut short. A carburized automotive gear or shaft with the wrong surface hardness, case depth or core hardness may not even complete its basic warranty period before failing totally at considerable expense and loss of prestige for the producer and the customer. The unexpected early failure of a large industrial gear or shaft in a coal mine or mill could result in lost production and income while the machine is down since replacement components may not be readily available. Fortunately, this scenario is not common. Most reputable gear and shaft manufacturers around the world would never neglect the metallurgical quality of their products.
"A Decade of Performance" is the theme of the American Gear Manufacturers Association Gear Expo 97, to be held October 19-22 at Detroit's Cobo Hall. Products and services related to every aspect of the gear manufacturing process, from turning and grinding the blanks to coating and inspection of the gears,will be represented at the show.
Gear noise associated with tooth surface topography is a fundamental problem in many applications. Operations such as shaving, gear grinding and gear honing are usually used to finish the gear surface. Often, gears have to be treated by a combination of these operations, e.g. grinding and honing. This is because gear honing operations do not remove enough stock although they do create a surface lay favorable for quiet operation. See Fig. 1 for typical honing process characteristics. Gear grinding processes, on the other hand, do remove stock efficiently but create a noisy surface lay.
Big gears, They drive the machinery that rolls steel, grinds limestone, pulverizes coal, pumps mud, mixes rubber, raises bridges and does many other heavy-duty industrial jobs. For 117 years, big gears have also driven the business of Horsburgh & Scott of Cleveland, OH.
It's an ideal time for a pilgrimage to AGMA’s Fall Technical Meeting and Gear Expo, which take place in Indianapolis.
Developed here is a new method to automatically find the optimal topological modification from the predetermined measurement grid points for bevel gears. Employing this method enables the duplication of any flank form of a bevel gear given by the measurement points and the creation of a 3-D model for CAM machining in a very short time. This method not only allows the user to model existing flank forms into 3-D models, but also can be applied for various other purposes, such as compensating for hardening distortions and manufacturing deviations which are very important issues but not yet solved in the practical milling process.
Manufacturing involute gears using form grinding or form milling wheels are beneficial to hobs in some special cases, such as small scale production and, the obvious, manufacture of internal gears. To manufacture involute gears correctly the form wheel must be purpose-designed, and in this paper the geometry of the form wheel is determined through inverse calculation. A mathematical model is presented where it is possible to determine the machined gear tooth surface in three dimensions, manufactured by this tool, taking the finite number of cutting edges into account. The model is validated by comparing calculated results with the observed results of a gear manufactured by an indexable insert milling cutter.
Have you ever stood on a beach at the edge of the water and felt the grains of sand dissolve from under your feet as the water recedes? No matter how hard you plant your feet or grip your toes, you can’t hold on to the sand. It just flows away right from under you. In many ways that sand is like the knowledge and experience of our graying manufacturing workforce. It seems inevitable that much of that knowledge is being washed away.
Okay. You've been convinced. You've gritted your teeth and decided to spend the money to launch a company Web site. Everybody from your teenage propeller-head to the girl in the mail room and the salesman in the flashy suit who gave you "such a deal" on Web site services has promised that your site will be the best thing that's happened to your business since the advent of CNC machines.
Vibration and noise from wind turbines can be significantly influenced - and therefore reduced - by selecting suitable gearing modifications. New options provided by manufacturers of machine tools and grinding machines, and especially state-of-the-art machines and controls, provide combined gearing modifications - or topological gearing corrections - that can now be reliably machined. Theoretical investigations of topological modifications are discussed here with the actual machining and their possible use.
Recently, a new type of hob with carbide inserts has been introduced, providing higher cutting speeds, longer tool life and higher feed rates when compared to re-grindable, high-speed steel hobs. But with this kind of hob, new challenges occur due to positional errors of the cutting edges when mounted on the tool. These errors lead to manufacturing errors on the gear teeth which must be controlled. In this paper, the tooth quality of a gear manufactured by hobs with different quality classes is analyzed using a simulation model in combination with Monte Carlo methods.
under pressure from numerous market forces. The oil sector’s decline, weakened global economies (particularly China) and local government policies outnumber and outweigh relieving forces such as the FAST Act, leaving the industry in a general downturn. The outlook has yet to become truly grim, but companies are beginning to scale back.
Undue vibrations, power spikes and grit give NASA pause.
Natural resources—minerals, coal, oil, agricultural products, etc.—are the blessings that Mother Earth confers upon the nations of the world. But it takes unnaturally large gears to extract them.
When parts you manufacture pass through numerous processes such as deep hole drilling, machining, hobbing and grinding, a CMM is essential when your customers require 100 percent in-process and final inspection.
The higher load carrying capacities, compact dimensions and longer life of hardened gears is an accepted fact in industry today. However, the costs involved in case hardening and subsequent finishing operations to achieve these advantages are considerable. For example, in order to achieve desired running properties on larger gears, it has been necessary to grind the tooth flanks. This costly operation can now be replaced, in many cases, by a new Hard Cutting (HC) process which permits the cutting of hardened gears while maintaining extremely low tooling costs.
The complete product news section from the January/February 2009 issue of Gear Technology, featuring giant-sized David Brown girth gears, gear inspection up to 4.5 meters and the latest Gleason gear grinder.
High demands for cost-effectiveness and improved product quality can be achieved via a new low pressure carburizing process with high pressure gas quenching. Up to 50% of the heat treatment time can be saved. Furthermore, the distortion of the gear parts could be reduced because of gas quenching, and grinding costs could be saved. This article gives an overview of the principles of the process technology and the required furnace technology. Also, some examples of practical applications are presented.
Beveloid gears are used to accommodate a small shaft angle. The manufacturing technology used for beveloid gearing is a special setup of cylindrical gear cutting and grinding machines. A new development, the so-called Hypoloid gearing, addresses the desire of gear manufacturers for more freedoms. Hypoloid gear sets can realize shaft angles between zero and 20° and at the same time, allow a second shaft angle (or an offset) in space that provides the freedom to connect two points in space.
Indexable carbide insert (ICI) cutting tools continue to play a pivotal role in gear manufacturing. By offering higher cutting speeds, reduced cycle times, enhanced coatings, custom configurations and a diverse range of sizes and capabilities, ICI tools have proven invaluable for finishing and pre-grind applications. They continue to expand their unique capabilities and worth in the cutting tool market.
Custom Gear and Machine, Inc., of Roscoe, IL, recently purchased a Reishauer RZ400 gear grinder and, on one job, has seen the cycle time drop from 40 minutes to six minutes, according to Tim Rose, vice president of manufacturing, who runs the business with co-owners Dave Patterson and Mike Rasmann.
Traditionally, a worm or a multi-stage gear box has been used when a large speed ratio is required. However, such boxes will become obsolete as size and efficiency become increasingly important considerations for a modern transmission. The single-enveloped worm gear has a maximum speed ratio of only 40 to 60. Its efficiency is only 30 to 60 per cent. The necessity of using bronze for the worm gear and grinding nitoalloy steel for the worm drives up material and manufacturing costs.
A few years ago, during a presidential election campaign, I saw an editorial cartoon that depicted a man standing outside a voting booth with a bemused expression on his face. Over the door to the booth was a quotation from Dante: "Abandon hope, all ye who enter here." Unfortunately for all of us, the grim jest is just as timely now. Once again, when we make our choice for president this year, the pick seems to be between Mr. Well-He's-Not-Actually-Awful and Mr. At-Least-He's-Not-The-Other-Guy. A candidate who can arouse truly positive and hopeful feelings in the electorate is once again not on the ballot.
For this interview, we spoke with George Wyss, president, and Dennis Richmond, vice president of Reishauer Corporation about gear grinding and its place in gear manufacturing today.
Sivyer Steel Corporation, Bettendorf, IA, an ISO-9002-certified casting specialist, is familiar with tackling tough jobs. The company has built an international reputation as a supplier of high-integrity castings, especially those which require engineering and/or full machining. Its not unusual for Sivyer's customers, especially those in the mining, recycling, power generation, valve and nuclear fields, to ask the foundry to produce a one-of-a-kind casting - often something revolutionary - but AnClyde Engineered Products' request was a special challenge, even for Sivyer.
The capabilities and limitations of manufacturing gears by conventional means are well-known and thoroughly documented. In the search to enhance or otherwise improve the gear-making process, manufacturing methods have extended beyond chip-cutting - hobbing, broaching, shaping, shaving, grinding, etc. and their inherent limitations based on cutting selection and speed, feed rates, chip thickness per tooth, cutting pressure, cutter deflection, chatter, surface finish, material hardness, machine rigidity, tooling, setup and other items.
Question: When evaluating charts from a gear inspection machine, it is sometimes found that the full length of the profile traces vary, and that sometimes they are less than the length of active profile (above start of active profile-SAP) by up to 20%. This condition could be caused by a concentricity error between tooth grinding and shaping, or by unequal stock removal when grinding. (See Fig. 1.) Is it possible that some of the variation is coming from the inspection machine? How can variation from the inspection machine be reduced?
Cubic boron nitride (CBN) finishing of carburized gearing has been shown to have certain economic and geometric advantages and, as a result, it has been applied to a wide variety of precision gears in many different applications. In critical applications such as aerospace drive systems, however, any new process must be carefully evaluated before it is used in a production application. Because of the advantages associated with this process, a test program was instituted to evaluate the load capacity of aerospace-quality gears finished by the CBN process as compared to geometrically identical gears finished by conventional grinding processes. This article presents a brief description of the CBN process, its advantages in an aerospace application, and the results of an extensive test program conducted by Boeing Helicopters (BH) aimed at an evaluation of the effects of this process on the scoring, surface durability, and bending fatigue properties of spur gears. In addition, the results of an x-ray diffraction study to determine the surface and subsurface residual stress distributions of both shot-peened and nonshot-peened CBN-ground gears as compared to similar conventionally ground gears are also presented.
At the time I'm writing this editorial, the new year is barely two weeks old. The air and the papers are still full of those inevitable end-of-the-year estimates of how far we've come in one area or another and how far we have to go. Analyses of the future, both grim and humorous, abound. There are even more of these laundry lists of PROBLEMS TO BE SOLVED IMMEDIATELY than usual, since a new president will be inaugurated in a week or so. Everyone had advice for George Bush on what to do first and how to do it. Some of the advice is sound, and I hope he's listening; however, reading all these position papers can be a depressing exercise.
Spur gear surface endurance tests were conducted to investigate CBN ground AISI 9310 spur gears for use in aircraft applications, to determine their endurance characteristics and to compare the results with the endurance of standard vitreous ground AISI 9310 spur gears. Tests were conducted with VIM-VAR AISI 9210 carburized and hardened gears that were finish ground with either CBN or vitreous grinding methods. Test conditions were an inlet oil temperature of 320 K (116 degree F), an outlet oil temperature of 350 K (170 degree F), a maximum Hertz stress of 1.71 GPa (248 ksi), and a speed of 10,000 rpm. The CBN ground gears exhibited a surface fatigue life that was slightly better than the vitreous ground gears. The subsurface residual stress of the CBN ground gears was approximately the same as that for the standard vitreous ground gears for the CBN grinding method used.
When it comes to setting the standard for gear making, the auto industry often sets the pace. Thus when automakers went to grinding after hardening to assure precision, so did the machine shops that specialize in gearing. But in custom manufacturing of gears in small piece counts, post-heat treat grinding can grind away profits too.
News Items About GRI
1 Geary Smith Appointed to GRI Board of Trustees, Elected Secretary of the Board (June 28, 2016)
Geary Smith from Caterpillar has been appointed to the GRI Board of Trustees and has been elected to serve as Secretary of the Board.&nbs... Read News
2 Schunk eGRIP Provides Digital Manufacturing Solutions (May 19, 2017)
A CAD program, online shop and additive manufacturing – the intelligent web-tool Schunk eGRIP offers three convenient functions in ... Read News
3 Gleason Improves Quality for Large Gear Grinding (April 23, 2010)
Gleason's latest generation of Profile Grinding Machines now can be equipped to perform a new process called OPTI-GRIND that signific... Read News
4 PHL Gripper Increases Module Efficiency (October 14, 2011)
With the PHL, Schunk launches a new generation of long stroke grippers. The PHL from Schunk alternatively disposes of a multi-tooth guida... Read News
5 Dapra Offers Grinding and Deburring Tools (October 3, 2011)
Dapra's series of Biax hand-held, air-powered tools include lightweight grinders and variable-speed deburring machines. The SRD 3-55/... Read News
6 Klingelnberg Opens Blade Grinding Center in Mexico (October 27, 2011)
In August 2011, Klingelnberg's Mexico site was moved to a new facility in Querétaro City. This investment is part of the compa... Read News
7 Micro Precision Gear Utilizes Holroyd Grinder (February 6, 2012)
Holroyd Precision, a division of the Precision Technologies Group, has recently completed a customer satisfaction survey with major custo... Read News
8 Long Stroke Gripper Offers Efficient Alternative (March 15, 2012)
When components of different sizes have to be handled alternately, conventional centric grippers quickly reach their limits. In order to ... Read News
9 Grieve Offers Inert Atmosphere Cabinet Oven (February 21, 2012)
No. 855 is a 1250 degree Fahrenheit electrically-heated, inert atmosphere cabinet oven from Grieve, currently used for heat treating at t... Read News
10 CIMCOOL 609 Designed for Grinding Performance (June 29, 2011)
CIMCOOL Fluid Technology has created CIMTECH 609, an innovative hybrid developed for superior grinding performance and excellent machinin... Read News
11 Holroyd Sells Grinding Machines to Chinese Company (December 20, 2011)
U.K.-based Holroyd Machine Tools and Components of Milnrow, Lancashire, a division of the Precision Technologies Group, has announced the... Read News
12 Duo Plus Boasts Efficient Grip System (April 26, 2011)
One of the most important keys to success in modern workpiece production is efficiency. Machines are supposed to perform more than just o... Read News
13 Luren's LFG-8040 Grinds Spur and Helical Gears (January 19, 2011)
The most recent development from Luren Precision Co., Ltd. is the vertical type CNC gear profile grinding machine, LFG-8040, th... Read News
14 Grieve Corp. Releases Gas-Heated Box Furnace (September 23, 2010)
No. 871 is an electrically-heated 2000 degrees F gas-heated box furnace from Grieve, currently used for heat treating and high temperatur... Read News
15 Drake Grinders Upgrade China Gage Capabilities (September 23, 2010)
Drake Manufacturing Services Co. recently shipped another in a series of high precision gage grinding machines to one of China's emer... Read News
16 Grieve Releases 863 Box Furnace (January 26, 2011)
No. 863 is an electrically-heated 1400 degrees F(~760 degrees C) box furnace from Grieve, currently used for preheating molds. 52 kW are ... Read News
17 Northfield Releases Rubber Grip Chuck (April 4, 2011)
Northfield Precision Instrument Corporation, a designer and manufacturer of precision workholding chucks, introduces their Automobile Rub... Read News
18 Drake Ships Two Thread Grinders to China (April 2, 2012)
Drake Manufacturing Services Co. has recently shipped two linear motor 4-axis CNC thread grinders to a Chinese petroleum company manufact... Read News
19 Northfield Chuck Enhances Grip Force (April 25, 2011)
Northfield Precision Instrument Corporation, a designer and manufacturer of precision workholding chucks, introduces their Model DPH-500-... Read News
20 Drake Manufacturing Enjoys Export Surge with Thread Grinder (May 23, 2011)
Drake Manufacturing Services Co. is enjoying a surge in exports to Chinese manufacturers, with orders in hand for more than 25 machines. ... Read News
21 Kapp Offers Advancements in Gear Grinding (April 23, 2012)
Two grinding machines with flexible process capabilities will be on display at booth N-7036 at the IMTS in Chicago, Illinois, September 1... Read News
22 Oelheld Releases DiaGrind 535-15 (March 4, 2013)
oelheld U.S. recently announced the availability of domestically manufactured DiaGrind 535-15. The multifunctional DiaGrind 535-15 is bee... Read News
23 Ingersoll Switches to SintoGrind IG (January 15, 2013)
To advance its grinding capabilities and improve the working environment, Ingersoll Cutting Tools has switched to SintoGrind IG, a synthe... Read News
24 Gleason Offers Wobble Compensation in Gear Grinding (December 27, 2012)
Conventional grinding cycles for cylindrical gears typically involve a significant amount of time dedicated to the manual alignment of th... Read News
25 EMAG Offers Hard Turning and Grinding Advantages (March 12, 2013)
The advantages of the process combination hard turning + grinding lie in process stream consolidation, improved component quality and gre... Read News
26 Tool Grind Workholding System Limits Runout (March 20, 2013)
MicroPlus, ANCA's new high accuracy workholding and tool support system, significantly reduces tool runout during grinding, enabling ... Read News
27 Gleason Offers Profile Grinding on Threaded Wheel Gear Grinding Machines (March 27, 2013)
Gleason Corporation recently announced the availability of a Profile Grinding option for its 300TWG Threaded Wheel Grinding Machine... Read News
28 ANCA to Demonstrate CNC Tool and Cutter Grinder (March 25, 2013)
The new, affordable ANCA MX5 CNC tool and cutter grinder will be demonstrated at EASTEC Booth 1152. Designed with the volume end-mill pro... Read News
29 Refrigeration Company Invests in Holroyd Grinder (December 13, 2012)
Holroyd Precision Ltd., the specialist machine tool design, manufacture and supply division of U.K.-based Precision Technologies Group (P... Read News
30 Grieve Offers High Temp, Walk In Oven (December 6, 2012)
No. 893 is an 850ºF, electrically-heated walk-in oven from Grieve, currently used for heat treating parts on rollout shelves at the ... Read News
31 Schunk Expands Gripping Modules (June 14, 2012)
Schunk is further expanding its program of universal gripping modules: After the parallel gripper PGN-plus, the centric gripper PZN-plus,... Read News
32 LMT Tools Assist China Agricultural Machinery Market (May 7, 2012)
Although the general market environment has become more difficult, the production of agricultural machinery in China is booming more than... Read News
33 Supertec to Present Seven New Grinding Machines at IMTS (June 16, 2010)
Supertec Machinery will exhibit seven new grinding machine models/types at this year's IMTS. They will be located in the Grinding Pav... Read News
34 Drake Ships Steering Worm Grinder to Europe (June 26, 2012)
Drake Manufacturing Services Co. has recently shipped a GS:TE-LM 200 Steering Worm Grinder to a European automotive parts supplier. The m... Read News
35 Ultra Grind Offers Two Meter Grinding Capacity (July 31, 2012)
The Hardinge Grinding Group introduces a new 2-meter capacity, UltraGrind 2000 grinding machine manufactured by Jones & Shipman, a Ke... Read News
36 Hardinge Offers Super-Grip Power Chucks (August 30, 2012)
Hardinge Inc. manufactures a premiere line of lever-operated, counter-centrifugal and dynamically balanced Sure-Grip Power Chucks. The le... Read News
37 Saint-Gobain Introduces Grinding App (August 27, 2012)
Saint-Gobain Abrasives has recently introduced a Norton Abrasives Grinding App. This application includes three calculators includi... Read News
38 Mechatronic Gripper Offers Rapid Small Part Handling (April 17, 2012)
The conversion from pneumatic to electric gripping modules has been made much simpler, thanks to the electrically driven small parts grip... Read News
39 Wenzel Introduces New Grind Burn Detection Capability (March 15, 2010)
In a continuing effort to enhance the capabilities of its gear measuring equipment, Wenzel has introduced a new feature that detects any ... Read News
40 United Grinding?s Newest Machine Grinds Shafts and Chucked Workpieces (April 11, 2006)
[photo] The Studen S242 from United Grinding is designed for the hard turning and grinding of high-precision applications for both shaf... Read News
41 Marposs New Gage Head Designed for Internal Grinders (April 11, 2006)
The Thruvar from Marposs is a through-the-spindle gage for in-process measurement application on internal grinding machines and was intro... Read News
42 Nortons New Gear Grinding Wheels Increase Life of Parallel Axis Spur Gears (April 11, 2006)
The new BRGg VPHS high speed grinding wheels from Saint Gobain are designed to reduce cycle times by increasing metal removal rates. The ... Read News
43 Service Network and Worcester Polytechnik Launch Grinding Consortium (April 14, 2006)
Service Network is spearheading an effort with Worcester Polytechnic Institute to form a grinding research center located in Worcester, M... Read News
44 Accura Technics New Grinder Works on Multiple Surfaces (April 22, 2006)
Accura Technics newest product is designed for precision grinding applicable to aerospace, automotive, bearing and optics manufactu... Read News
45 Gleasons New Threaded Grinder Optimizes Fine Finishing of Hard Spur and Helical Gears (January 2, 2007)
Gleasons new Genesis 130TWG High Speed Threaded Wheel Grinder features a new design that reduces floor space requirements and impro... Read News
46 Walter Grinders New Tool Grinder Offers Shorter Cycle Times (April 22, 2006)
Walter Grinders unveiled its Helitronic Vision CNC tool grinder at IMTS. According to the companys press release, the grinder offer... Read News
47 Drakes Newest Thread Grinder Utilizes Robot Load/Unload System (April 11, 2006)
The GS: TE-LM thread grinder from Drake Manufacturing is fitted with a robot load/unload system that provides maximum throughput for high... Read News
48 Landis Introduces New Grinders at IMTS (April 6, 2006)
Landis Grinding Systems new LT1-1200 flexible CNC grinder with variable swiveling wheelhead will be displayed for the first time at... Read News
49 New Furnace from Grieve (March 9, 2005)
The No. 943 pit furnace from Grieve is an electrically heated, top loading pit furnace capable of 2,000 degrees F and is suitable for hea... Read News
50 Sigma Pool Merges All Grinding Activities (February 7, 2005)
Sigma Pool partners have merged all activities in the field of cylindrical gear grinding under the roof of Liebherr-Verzahntechnik GmbH i... Read News
51 New Grinder for Gear Cutter Blades (January 19, 2004)
The SBG cutter grinder from ANCA can grind parts to +/ ?5 microns, and it includes a chuck and palletized auto load that is specifically ... Read News
52 Samputensil Introduces High Capacity Grinding Machine (January 6, 2006)
The new 250G generating grinding machine from Samputensili, introduced at EMO 2005 was developed to achieve a shorter cycle time. Acco... Read News
53 United Gear Buys Tooth Grinder (February 22, 2006)
United Gear & Asssembly installed a new Kapp KX 300P grinder. The machine is designed for grinding external spur and helical gears. Si... Read News
54 New Depressed Center Wheels Introduced by Camel Grinding Wheels (April 6, 2006)
CGW-Camel Grinding Wheels has introduced Fast Cut Series Aluminum Oxide Type 27 Depressed Center Wheels with N-grade bond for right angle... Read News
55 Bryan Grinder Releases New Software (April 3, 2006)
Bryant? Grinder, a division of Vermont Machine Tool, released Revelations? software, a Microsoft Windows-based, CNC control software that... Read News
56 Makinos New Grinding Machining Center Grinds, Drills, Bores and Mills on the Same Machine (January 9, 2007)
Makino introduced the G5 Grinder horizontal machining center, capable of grinding, drilling, boring and milling all on the same machine.... Read News
57 Gleasons Newest Threaded Wheel Grinder Delivers Faster Floor-to-Floor Times for Cylindrical Gears up to 300 mm (February 13, 2007)
The 300 TWG from Gleason Corp. is designed to deliver fast floor-to-floor times for grinding of cylindrical gears with a diameter up to 3... Read News
58 Surface Grinder Operates with Maximum Productivity, Minimum Cycle Times (February 4, 2009)
The TechMaster 844, from Jones and Shipman, offers 800 mm x 400 mm grinding capacity with a vertical capacity of 360 mm. The machine is ... Read News
59 Gleason Grinder Cuts Production Times (February 4, 2009)
The Genesis 160TWG threaded wheel grinder from Gleason is capable of hard finish grinding of cylindrical gears with diameters up to 160 m... Read News
60 Bryant Celebrates 100 Years of Grinding (November 24, 2008)
Bryant Grinder, a division of Vermont Machine Tool Corporation, is celebrating its 100th anniversary in 2009, making it one of the olde... Read News
61 MHI Grinder Hones Four Times Faster (September 30, 2009)
The ZI20A from Mitsubishi Heavy Industries is an internally toothed ring gear grinding machine capable of high-speed and precision with l... Read News
62 Grinding Wheel Improves Surface Finish (October 29, 2009)
The SK23w ceramic grinding wheel specification from Burka-Kosmos drastically increases the Q'w and V'w rates. This type of grindi... Read News
63 Grieve Furnace Used for Gear Preheats (April 26, 2013)
Grieve Corporation introduces No. 815, a 500°F electric rotary hearth oven, currently in use for preheating gears at a customer&rsquo... Read News
64 Versatile Reishauer Grinder Adapted for Larger Gears (December 28, 2009)
The RZ 260 gear grinding machine from Reishauer is based on the successful RZ 150 series, but not only has size been increased, but all c... Read News
65 Grieves New Oven Burns Hydrocarbons from Machined Metal Parts (July 19, 2007)
The new No. 875 oven from Grieve is a gas-fired, 1600ºF (871ºC) specialty furnace from Grieve, currently used for burning off h... Read News
66 Philadelphia Gear’s Birmingham Facility Installs Hofler Grinder (July 10, 2007)
Philadelphia Gear Corp. announced that its Birmingham Regional Service Center installed a 1.5 meter Höfler grinder. ... Read News
67 Schafer Gear Adds New Grinding Equipment (May 24, 2007)
Schafer Gear Works invested in new production equipment, including new gear grinding machines in the company's South Bend, IN, and Ro... Read News
68 Marposs Introduces Gauge Head for In-Process Grinder Control at Eastec (February 26, 2007)
Marposs Corp. will show its new NanoUnimar ultra-compact gauge head for in-process grinder control in Booth #3006 at the EASTEC APEX 2007... Read News
69 Schunk Releases New Electrical Miniature High-Speed Parallel Gripper (February 14, 2007)
Schunk Workholding's miniature high-speed parallel gripper (MHP) is the two-finger counterpart to the centric gripper SMG. Accord... Read News
70 Cinetec Grinding Moves Headquarters to Hagerstown, Maryland (May 29, 2007)
Cinetic Landis Grinding Corp. relocated its headquarters and manufacturing/assembly facility approximately 15 miles to Hagerstown, MD. ... Read News
71 Drakes New Mini External Thread Grinder Targets Small Parts Makers (May 31, 2007)
With a work envelope of 100 mm x 100 mm, Drake's GS:TEM mini three-axis thread grinder is aimed at higher volume, precision threaded ... Read News
72 Highway Machine Co. Acquires North America's First Six-Meter Form Grinder (July 3, 2007)
HMC announced its recent acquisition of the first six Meter, (240"), Hofler Form Grinder in NorthAmerica, which will be in... Read News
73 Kapp's Rotor Grinding Technology Improves Efficiency by 30 Percent (June 15, 2007)
The Kapp RX 59 allows the rotors used in air compressors to be manufactured on the machines by using a high precision grinding process.Ro... Read News
74 SCHUNK Offers New Sealed DRG Two-Finger Radial Gripper (June 1, 2010)
The new DRG Two-Finger Radial Gripper from SCHUNK is utilized for difficult handling tasks. The gripper is used in dirty working environm... Read News
75 Grieve Introduces Electric Rotary Hearth Oven (June 7, 2013)
Grieve Corporation introduces No. 815, a 500°F electric rotary hearth oven, currently in use for preheating gears at a customer&rsquo... Read News
76 Hewland Installs Klingelnberg Oerlikon G60 Spiral Bevel Gear Grinding Machine (November 16, 2015)
Hewland Engineering recently announce the installation of a Klingelnberg Oerlikon G60 spiral bevel gear grinding machine. Utilizing Kling... Read News
77 Klingelnberg to Showcase Oerlikon G 30 Bevel Gear Grinding Machine at Gear Expo (September 9, 2015)
Klingelnberg will be exhibiting its capabilities with a presentation of cutting-edge technology “made in Germany” in the form... Read News
78 Gleason Genesis 200GX Threaded Wheel Grinding Machine to be Introduced at Gear Expo (August 5, 2015)
Gleason recently announced it will introduce advanced machines, tooling, and global customer support services covering a wide array of pr... Read News
79 Schunk Offers 2-Finger Gripper (December 17, 2015)
The PWG-plus is compact and robust due to the oval piston drive, the strong aluminum housing, and the almost wear-fr... Read News
80 Speedgrip Chuck Acquired by Stratford-Cambridge Group (December 21, 2015)
Speedgrip Chuck, Inc. has been acquired by an affiliate of the Stratford-Cambridge Group. Speedgrip was founded in 1946 and operates and... Read News
81 Northfield Internal Grip Collet Chuck Balances Drive Shafts (January 28, 2016)
Northfield Precision Instrument Corporation has designed a special internal grip collet chuck for balancing drive shafts. The collet on t... Read News
82 PTG to Highlight Ultra-Precision at GrindTec 2016 (January 20, 2016)
PTG Deutschland GmbH, the German division of U.K.-based Precision Technologies Group, has chosen GrindTec 2016 – the International ... Read News
83 Samputensili SG 160 Sky Grind Introduces Dry Grinding of Gears to Star SU Line (December 24, 2015)
Samputensili has recently launched a world premiere at EMO Milan 2015. The new machine, the SG 160 Sky Grind, is designed to eliminate th... Read News
84 Dillon Full Grip Jaws Reduce Distortion and Provide More Friction (August 4, 2015)
Dillon Manufacturing recently introduced full grip jaws made of 1018 CR steel from 6 inches to 15 inches in diameter, with heights of 2, ... Read News
85 Kapp Niles ZE 800 Profile Gear Grinder Will Be Showcased at Gear Expo 2015 (August 3, 2015)
The Kapp Niles ZE 800 Profile Gear Grinder and the PM 750/1250 portable gear inspection system from R&P Metrology GmbH will be demons... Read News
86 True Gear & Spline Increases Grinding Capacity With New Niles ZP 12 (June 26, 2015)
True Gear& Spline Ltd. recently added CNC gear profile grinding to their machining capabilities with their newly installed Niles ZP 1... Read News
87 Junker Builds New Platform for Cylindrical and Non-Cylindrical Grinding of Workpieces (June 24, 2015)
Junker recently built a new platform for cylindrical and non-cylindrical grinding of workpieces with a swing diameter of 470 mm and a par... Read News
88 Schunk EGN Safety Gripping System is Continuously Powered (June 18, 2015)
The EGN Safety is the first certified safety gripping system from Schunk for use with human and robot interaction. It is certified in acc... Read News
89 Grieve 1200ºF Walk-in Oven Offers On-Site Heat Treating (July 7, 2015)
No. 901 is a 1200ºF (649ºC) electrically-heated walk-in oven from Grieve, currently used for heat treating at the customer&rsqu... Read News
90 Dillon 1018 CR Steel Full Grip Jaws Reduce Distortion and Provides More Friction (July 16, 2015)
Dillon Manufacturing recently introduced full grip jaws made of 1018 CR steel from 6" to 15" in diameter, with heights of 2&quo... Read News
91 Junker and Zema to Exhibit Gear Grinding Machines Together at EMO Milano (July 30, 2015)
At EMO Milano 2015, Junker Group and Zema will be exhibiting together for the first time in Europe: Zema will be demonstrating a cylindri... Read News
92 Riten Industries Now Capable of Repairing and Remanufacturing Tailstocks for Lathes and Grinders (July 23, 2015)
Riten Industries recently announced the capability to repair and remanufacture tailstocks for lathes and grinders from all manufacturers.... Read News
93 Schunk PGN-Plus-P Offers Gripping Improvements (February 17, 2016)
Schunk has introduced several improvements on the original PGN-Plus and has announced the newest generation gripper, PGN-Plus-P. Enlarged... Read News
94 Saint-Gobain Norton Quantum3 Depressed Center Grinding Wheels Designed to Decrease Downtime, Improve User Comfort (March 29, 2016)
Saint-Gobain Abrasives has introduced Norton Quantum3 (NQ3) Depressed Center Grinding Wheels. Featuring a proprietary grain along with a ... Read News
95 Dillon Manufacturing Full Grip Jaws Feature Different Material Versions for Different Applications (February 22, 2017)
Dillon Manufacturing full grip jaws available from 6 inches to 24 inches (140mm to 630mm) in diameter, with heights of 2, 4 and 6 inches,... Read News
96 Grieve No. 1040 Inert Atmosphere Pit Furnace (February 13, 2017)
No. 1040 is a 2200°F (1204°C), inert atmosphere pit furnace from Grieve currently used for heat treating automotive parts in bask... Read News
97 Chevalier Grinder Features Rough and Fine-Grinding Cycles (February 3, 2017)
The FSG-1224ADIII is fully automatic on the X- and Y-axis, includes 2-axis servo control and a new PLC controller that features a grind c... Read News
98 ANCA Machine Tools Promotes Keith Grillot to Sales Manager for U.S. and Canada (February 22, 2017)
ANCA Machine Tools (AMT) has named Keith Grillot sales manager for its U.S. and Canadian markets, according to Russell Riddiford, ANCA pr... Read News
99 EMAG VLC 100 GT Combines Vertical Turning and Finish Grinding in One Package (March 31, 2017)
When it comes to machining times, combining various machining processes in one setup offers enormous savings potential. With the combinat... Read News
100 Junker JUMAT Machine Offers Simultaneous Grinding of ID, OD and Faces of Gears (May 31, 2017)
Junker has introduced the JUMAT 6S 18-20S-18, the latest of Junker's JUMAT series of modular grinding machines, which is capable of g... Read News
101 ANCA Motion LinX Linear Motor Technology Now Equipped on Grinding Machines for Improved Chip Evacuation (May 18, 2017)
Highly polished flutes and gash surfaces improve chip evacuation and aid tool performance. The smoother surface enables swarf (or chips) ... Read News
102 Grieve No. 1030 Oven Provides Heat Treat for Large Gears (January 19, 2017)
No. 1030 is a 550 degrees Fahrenheit floor-level electric cabinet oven from Grieve, currently used for heating large gears at the custome... Read News
103 Röhm KZF-S External Clamping Collet Chucks Designed for Gear Surface Face Grinding (December 7, 2016)
Röhm Products of America now offers a powered external clamping chuck for gear surface face grinding. The KZF-S collet chuck is espe... Read News
104 Elliot Tool Technology Carbide-Roll Burnishing Tools Designed to Eliminate Grinding, Honing and Polishing Processes (May 11, 2016)
Carbide-Roll Burnishing Tools by Elliott Tool Technology, which produce a mirror-like surface finish while eliminating secondary operatio... Read News
105 Holroyd Precision Limited Zenith 400 Helical Profile Grinder Works with Aluminum Oxide, CBN and Vitrified CBN Technologies (April 15, 2016)
Precision Technologies Group company, Holroyd Precision Limited, is to supply one of its ultra-precise Zenith 400 helical profile grinder... Read News
106 Big Kaiser Mega Perfect Grip Milling Chuck Designed to Eliminate End Mill Pullout (April 4, 2016)
Big Kaiser introduces the Mega Perfect Grip from Big Daishowa, a simple to handle, heavy-duty milling chuck for heat resistant super allo... Read News
107 Röhm to Showcase Duro-TA XT Key Bar Chuck and Power-Grip Clamping System at IMTS (May 18, 2016)
At IMTS 2016 in Booth W-2528, Röhm Products of America will show its strength as a one-stop clamping and gripping supplier by presen... Read News
108 IMTS 2016: Speedgrip Chuck (W-2222) (September 9, 2016)
Quick Change Adapter SystemSpeedgrip will be showing their new Quick Change Adapter System at IMTS 2016. Merging the tested and true Caml... Read News
109 Kitagawa Digital Grip Force Analyzer Software Determines Workholding Gripping Force (November 25, 2016)
Kitagawa NorthTech, Inc. has introduced their new Digital Grip Force Analyzer software and kit (PC Version) for machine tool users and ma... Read News
110 Gear Motions Relaunches Pro-Gear Division, Offers Gear Grind Only Service (November 11, 2016)
The Pro-Gear Division of Gear Motions Inc. is being relaunched as a gear grind only division. Pro-Gear will focus exclusively on providin... Read News
111 Junker Delivers 500th Grinding Machine to Volkswagen Group (June 10, 2015)
Grinding machine manufacturer Junker recently celebrated a milestone as the Volkswagen Group recently purchased their 500th Junker grindi... Read News
112 Hewland Engineering Expands Grinding Capabilities (May 13, 2015)
Hewland Engineering recently announced a multi-million pound investment in state-of-the-art spiral bevel grinding capability, due to arri... Read News
113 Grieve Releases High-Temp Atmosphere Furnace (January 6, 2014)
No. 854 is a special high-temperature, 2,200 degrees F electrically-heated, inert atmosphere floor furnace from Grieve, currently used fo... Read News
114 IDC Installs Niles ZP24 Gear Grinder (December 26, 2013)
IDC Industries is installing their new Niles ZP24 gear grinder. This new machine, the largest of its type in Michigan, will allow IDC to ... Read News
115 C&B Machinery Offers Clamp Bore Disc Grinding Machine (November 22, 2013)
C & B Machinery has received multiple orders for its latest generation Model CBV-3 Clamp Bore disc grinding machine. The automotive i... Read News
116 Oelheld Develops HSS Grinding Oil (January 24, 2014)
SintoGrind HSS was especially developed for profile and flute grinding of steel alloys and in particular for High-Speed-Steel and medical... Read News
117 United Grinding to Display Innovations at GrindTec 2014 (January 27, 2014)
United Grinding, the largest single-source provider of complete and integrated grinding solutions, will showcase its latest grinding, ero... Read News
118 Burka-Kosmos Offers Latest Grinding Wheel (February 3, 2014)
The Mira Ice product line of gear grinding wheels was developed in order to meet the requirements of profile grinding larger gears. A new... Read News
119 Oelheld Introduces SintoGrind 353 (January 31, 2014)
Oelheld U.S. introduces SintoGrind 353, a premium gear grinding fluid formulated from pure synthetic base stocks. SintoGrind 353 was espe... Read News
120 Forkardt Offers OmniGrip Collet System (November 19, 2013)
Forkardt OmniGrip Collet Systems are flexible, sealed collet heads that interchange in seconds and are available with spindle mounts for ... Read News
121 Körber Schleifring Becomes United Grinding (November 12, 2013)
Körber Schleifring, a global provider of grinding machine technology and its North American arm United Grinding Techologies are now ... Read News
122 Bryant Offers Miniature Grinder (June 21, 2013)
The new Bryant Miniature precision grinder (Model RU1) with standard 4.0 inch (100 mm) travel in both “X” and “Z”... Read News
123 Norton Grinding Abrasives Feature Bond Technology (June 20, 2013)
Norton Abrasives, a brand of Saint-Gobain, has developed and launched Norton Vitrium3, the next generation of bonded abrasives prod... Read News
124 Grieve No. 852 Walk-In Oven Designed for Customer for Heat Treating and Baking Varnish (June 30, 2017)
No. 852 is an 850°F (454°C), high temperature walk-in oven from Grieve, currently used for heat treating and baking varnish at th... Read News
125 Grieve Furnace Treats Large Gears (July 24, 2013)
No. 1030 is a 550ºF floor-level electric cabinet oven from Grieve, currently used for heating large gears at the customer’s fa... Read News
126 Grieve Offers High-Temp Bench Oven (August 23, 2013)
No. 1017 is a 1000ºF high-temperature bench oven from Grieve, currently used for various heat processings at the customer’s fa... Read News
127 3M Introduces Cubitron II Conventional Wheels for Gear Grinding (November 1, 2013)
3M Abrasive Systems is introducing 3M Cubitron II Conventional Wheels for Gear Grinding, giving engineers new tools to take the manufactu... Read News
128 Schunk Integrates Grippers with Sensing Technology (October 31, 2013)
Schunk has enlarged its number of available sensors for the modular system of grippers with the new OAS sensor. When grippers such as the... Read News
129 PTG to Showcase Grinding in Germany (February 12, 2014)
PTG Deutschland GmbH, the German-based division of Britain’s Precision Technologies Group, has chosen GrindTec 2014 to showcase its... Read News
130 United Grinding Invites Customers to Grinding Symposium (March 5, 2014)
The United Grinding Group – Körber Schleifring up until EMO 2013 – has clearly understood the signs of the times in the ... Read News
131 Schunk Introduces Servo-Electric Parallel Grippers (January 9, 2015)
Schunk recently introduced the WSG series of servo-electric 2-Finger Parallel Grippers. They are designed for parts handling and assembly... Read News
132 Grieve Introduces No. 814 Cabinet Oven (December 3, 2014)
No. 814 is a 500 degree, electrically-heated cabinet oven from Grieve, currently used for various plastic and metal part heat treating op... Read News
133 Schunk Introduces EGS Cleanroom Gripper (December 1, 2014)
The EGS from Schunk is designed for the gripping of small to medium sized workpieces, with flexible force and high-speed in clean environ... Read News
134 ITAMCO Gets Invite to Grid Cell Program (February 13, 2015)
Indiana Technology and Manufacturing Companies (ITAMCO) was recently invited to display their technology products at the Advanced Materia... Read News
135 Grieve Installs Electric Rotary Hearth Oven (February 19, 2015)
Grieve Corporation recently introduced No. 815, a 500°F electric rotary hearth oven, currently in use for preheating gears at a custo... Read News
136 Junker Acquires Majority Share in Brazilian Grinding Machine Manufacturer (March 19, 2015)
The Junker Group recently added Brazilian grinding machine manufacturer ZEMA to its corporate group. ZEMA was founded back in 1953, has m... Read News
137 Drake Delivers Drum Grinder for the Tapered Roller Bearing Industry (February 25, 2015)
Drake Manufacturing Services Co., LLC recently delivered a “drum” or “crown” grinder to an Asian manufacturer of ... Read News
138 Dillon Air Chucks Provide Maximum Gripping Surface (September 17, 2014)
Dillon pin-location top jaws hold small and delicate parts – such as those often machined using air chucks - firmly without damagin... Read News
139 Industry Gathers for United Grinding Symposium (June 24, 2014)
The world's largest event in the grinding machine industry drew to a close in Thun (Switzerland) with an enthusiastic audience. Every... Read News
140 EMAG Introduces Small Grinding Center (April 15, 2014)
Demand for components such as gearwheels, planetary gears, chain gears or flanged components for cars typically runs in quantities of millions... Read News
141 Grieve Introduces Latest Oven (April 10, 2014)
No. 839 is an electrically-heated, 850°F walk-in oven from Grieve, currently used for heat treating and high-temperature batch paint baking... Read News
142 United Grinding Announces New President (March 27, 2014)
United Grinding North America, Inc. recently announced that current president and CEO, Rodger Pinney, has been elected as vice chairman... Read News
143 Grieve Releases Heavy-Duty Box Furnace (May 5, 2014)
No. 954 is an electrically-heated 2000°F(~1093°C) inert atmosphere heavy-duty box furnace from Grieve, currently used for heat treating titanium at the customer’s facility... Read News
144 Gear Grinders Find Value in RUF Briquetting Systems (May 7, 2014)
Briquetting is a way to regain value from the materials you already have, and gear grinding operations are finding the value they thought was lost in their grinding sludge... Read News
145 DiaGrind 535-5 Offers Advantages in Gear Honing and Grinding (June 11, 2014)
The multifunctional metalworking fluid DiaGrind 535-5 has many enthusiastic users all over the world. They range from small shops to mult... Read News
146 Vomat Offers Temp Stability During Grinding (May 23, 2014)
In order to produce high-performance cutting tools, tool manufacturers go to great lengths to get all manufacturing parameters right. Production conditions have tremendous influence on the final quality of the tool... Read News
147 Holroyd Launches Worm Gear Grinding Stations (May 31, 2013)
Holroyd Precision Limited has launched a brand new, full CNC machine range that is specifically designed to provide ultra-high levels of ... Read News