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The complete Product News section from the October 2012 issue of Gear Technology.
The complete Product News section from the January/February 2014 issue of Gear Technology.
The complete Product News section from the August 2014 issue of Gear Technology.
The complete Product News Section from the August 2013 issue of Gear Technology.
The complete Product News section from the June/July 2013 issue of Gear Technology.
In the last section, we discussed gear inspection; the types of errors found by single and double flank composite and analytical tests; involute geometry; the involute cam and the causes and symptoms of profile errors. In this section, we go into tooth alignment and line of contact issues including lead, helix angles, pitch, pitchline runout, testing and errors in pitch and alignment.
It is very common for those working in the gear manufacturing industry to have only a limited understanding of the fundamental principals of involute helicoid gear metrology, the tendency being to leave the topic to specialists in the gear lab. It is well known that quiet, reliable gears can only be made using the information gleaned from proper gear metrology.
In 1993, M & M Precision Systems was awarded a three-year, partial grant from the Advanced Technology Program of the Department of Commerce's National Institute of Standards and Technology (NIST). Working with Pennsylvania State University, M&M embarked on a technology development project to advance gear measurement capabilities to levels of accuracy never before achieved.
GT Videos featuring R&P Metrology, the latest from our Twitter and LinkedIn feeds and an introduction to gearboxfailure.com
The American Society of Mechanical Engineers (ASME) announced at Gear Expo '95 that a national service for the calibration of involute artifacts is now available at the Department of Energy's Y-12 Plant in Oak Ridge, TN.
Compact, custom and portable solutions are gaining more attention in manufacturing today as companies seek out the tools that offer the greatest productivity gains on the shop floor. Gear inspection seems to be following suit.
Measurement institutions of seven different countries — China, Germany, Japan, Thailand, Ukraine, United Kingdom and the U.S. — participated in the implementation of the first international comparison of involute gear measurement standards. The German metrology institute Physikalisch-Technische Bundesanstalt (PTB) was chosen as the pilot laboratory as well as the organizer. Three typical involute gear measurement standards provided by the PTB were deployed for this comparison: a profile, a helix and a pitch measurement standard. In the final analysis, of the results obtained from all participants, the weighted mean was evaluated as reference value for all 28 measured parameters. However, besides the measurement standards, the measured parameters, and, most importantly, some of the comparison results from all participants are anonymously presented. Furthermore, mishandling of the measurement standards as occurred during the comparison will be illustrated.
An in-depth look at the major booths with the latest technology used in gear manufacturing.
In recent years, gear inspection requirements have changed considerably, but inspection methods have barely kept pace. The gap is especially noticeable in bevel gears, whose geometry has always made testing them a complicated, expensive and time-consuming process. Present roll test methods for determining flank form and quality of gear sets are hardly applicable to bevel gears at all, and the time, expense and sophistication required for coordinate measurement has limited its use to gear development, with only sampling occurring during production.
The complete Product News section from the July 2014 issue of Gear Technology.
Part I of this paper, which appeared in the January/February issue of Gear Technology, described the theory behind double-flank composite inspection. It detailed the apparatus used, the various measurements that can be achieved using it, the calculations involved and their interpretation. The concluding Part II presents a discussion of the practical application of double-flank composite inspection -- especially for large-volume operations. It also addresses statistical techniques that can be used in conjunction with double-flank composite inspection, as well as an in-depth analysis of gage R&R for this technique.
A reader clarifies technology presented in the March/April 2011 issue.
What does it mean to make "better" gears? Better gears more closely resemble the intended design parameters.
The complete Product News section from the March/April 2013 issue of Gear Technology.
Meeting the many challenges of large gear inspection.
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.
Gear metrology is a revolving door of software packages and system upgrades. It has to be in order to keep up with the productivity and development processes of the machines on the manufacturing floor. Temperature compensation, faster inspection times and improved software packages are just a few of the advancements currently in play as companies prepare for new opportunities in areas like alternative energy, automotive and aerospace/defense.
It may not be widely recognized that most of the inspection data supplied by inspection equipment, following the practices of AGMA Standard 2015 and similar standards, are not of elemental accuracy deviations but of some form of composite deviations. This paper demonstrates the validity of this “composite” label by first defining the nature of a true elemental deviation and then, by referring to earlier literature, demonstrating how the common inspection practices for involute, lead (on helical gears), pitch, and, in some cases, total accumulated pitch, constitute composite measurements.
The purpose of gear inspection is to: Assure required accuracy and quality, Lower overall cost of manufacture by controlling rejects and scrap, Control machines and machining practices and maintain produced accuracy as machines and tools wear, Determine hear treat distortions to make necessary corrections.
Metrology is a vital component of gear manufacturing. Recent changes in this area, due in large part to the advent of computers, are highlighted in this article by comparison with more traditional methods.
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.
I noted with interest the beginning of Gear Technology's three-part series on ISO 9000 certification. I also recently attended Brown & Sharpe's/Leitz gear metrology seminar. Both events caused me to smile and reflect.
News Items About Hexagon Metrology
1 Milwaukee Machine Works Purchases Hexagon Metrology CMM (March 7, 2011)
Hexagon Metrology, Inc. has announced that precision component manufacturer Milwaukee Machine Works has purchased a Leitz PMM-G ultra-acc... Read News
2 Hexagon Metrology Debuts CNC Measuring Arm at Fabtech (January 19, 2005)
Hexagon Metrology introduced a new CNC articulated measuring arm at Fabtech that president and CEO William Gruber calls ?our version of a... Read News
3 IMTS Preview: Hexagon Metrology (June 27, 2012)
Hexagon Metrology Inc. will feature innovations in measurement automation at IMTS (International Manufacturing Technology Show) 2012 bein... Read News
4 Hexagon Metrology Releases PC-DMIS Gear (February 26, 2013)
Hexagon Metrology announces the release of PC-DMIS Gear 2.5, a sophisticated software module, designed for basic and advanced gear meas... Read News
5 Hexagon Metrology Offers Next Generation of Romer Absolute Arm (April 8, 2014)
Hexagon Metrology recently announced the next generation of the Romer Absolute Arm. The enhanced portable measuring arm features optimized ergonomics... Read News
6 IMTS Preview: Hexagon Metrology (July 18, 2014)
Hexagon Metrology recently launched PC-DMIS 2014, a major release of its measurement software used for the collection, evaluation, manage... Read News