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The objective of this paper is to demonstrate that transmission gears of rotary-wing aircraft, which are typically scrapped due to minor foreign object damage (FOD) and grey staining, can be repaired and re-used with signifi cant cost avoidance. The isotropic superfinishing (ISF) process is used to repair the gear by removing surface damage. It has been demonstrated in this project that this surface damage can be removed while maintaining OEM specifications on gear size, geometry and metallurgy. Further, scrap CH-46 mix box spur pinions, repaired by the ISF process, were subjected to gear tooth strength and durability testing, and their performance compared with or exceeded that of new spur pinions procured from an approved Navy vendor. This clearly demonstrates the feasibility of the repair and re-use of precision transmission gears.
This paper presents a new approach to repair industrial gears by showing a case study where pressure angle modification is also considered, differently from the past repairing procedures that dealt only with the modification of the profile shift coefficient. A computer program has been developed to automatically determine the repair alternatives under two goals: minimize the stock removal or maximize gear tooth strength.
Following is a report on the R&D findings regarding remediation of high-value, high-demand spiral bevel gears for the UHâ€“60 helicopter tail rotor drivetrain. As spiral bevel gears for the UHâ€“60 helicopter are in generally High-Demand due to the needs of new aircraft production and the overhaul and repair of aircraft returning from service, acquisition of new spiral bevel gears in support of R&D activities is very challenging. To compensate, an assessment was done of a then-emerging superfinishing method—i.e., the micromachining process (MPP)—as a potential repair technique for spiral bevel gears, as well as a way to enhance their performance and durability. The results are described in this paper.
"If it ain't broke, don't fix it," goes the hoary bromide. But what if the time comes - and it most surely will - that in fact it is broke? Do you fix it or replace it? And when does gearbox maintenance and repair arrive at a point of diminishing returns and buying new is the answer?
Gearing for Munchkins Gene Kasten, president of Repair Parts, Inc., of Rockford, IL, is the proud owner of a miniature Barber-Colman hobber, the only one of its kind in the world. The machine, a replica of the old B-C "A" machine, was built between 1933 and 1941 by W. W. Dickover, who devoted 2, 640 hours of his spare time to the project.
When a gearbox remanufacturer is trying to decide whether to regrind or replace a gear, any number of factors could be running through their head. Here are some remanufacturers' processes on how they reach the conclusions they do, and why you should listen to them.
Much has happened since we last reported on the malfunctioning solar array rotary joint (SARJ) attached to the International Space Station. Space shuttle Endeavour dropped in for a two-week visit in November during which repairs were made and invaluable data collected.
How do you fix a stone gear that has a chipped tooth and has surfaces roughened by acid erosion and covered in black grime? You bring in an art conservator.
Itâ€™s happened to most manufacturers at one point or another. A defective product comes back from a customer in need of repair. Perhaps a bearing or a gear drive has failed, and the customer simply needs a replacement. Upon further examination, the company realizes it was never one of its products in the first place, but a fabricated copy that snuck into the market. The manufacturing community has been dealing with counterfeit products for decades, but used machinery dealers and Internet shoppers seem to continuously get hit by scam artists.
The wind turbine industry has been plagued with gearbox failures, which cause repair costs, legal expenses, lost energy production and environmental pollution.
Historically, wind turbine gearbox failures have plagued the industry. Yet an effective oil analysis program will increase the reliability and availability of your machinery, while minimizing maintenance costs associated with oil change-outs, labor, repairs and downtime. Practical action steps are presented here to improve reliability.
Historically, gearbox original equipment manufacturers (OEMs) and repair organizations have tended to offer their customers no-load, full speed (spin) tests as a standard performance test. If a load test was specified, the supplier would probably offer a locked torque back-to-back simulated load test, which requires a large investment in tooling to connect shafts of the test and slave gearboxes.
Kapp Niles celebrates young inventors, Solar Atmospheres expands, Klingelnberg increases training programs, Liebherr celebrates 50 years in the USA, Timken Expands Southeast regional repair facility and more news for the gear industry.
Gears are a crucial part of many machines, and if they wear and corrode beyond repair it can then be a costly expense to replace them. Mark Meyer, Sales Manager, North America at SIFCO ASC, explains how brush plating can help prevent gears from being damaged and how the process can be used to restore worn or corroded gear components.
News Items About repair
1 Timken Expands Service Center in Washington to Deliver More Repair Capabilities (October 28, 2015)
The Timken Company recently opened a 70,000-square-foot, motor and gearbox repair facility adjacent to its existing service center in Pas... Read News
2 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
3 GTI Spindle Launches Fourth Repair Facility at Caterpillar Plant (April 30, 2006)
GTI Spindle Technology launched a state-of-the-art spindle repair facility onsite at Caterpillar Fuel Systems in Pontiac, IL. Accordi... Read News
4 Dana Opens Gearbox Repair and Service Center in Slidell, Louisiana (February 5, 2020)
Dana Incorporated has announced that it has opened the doors to a nearly 32,000 square-foot (3,000 square-meter) facility in Slidell, Lou... Read News
5 Timken Expands Manufacturing Capability of Southeast Regional Gear Repair Facility (January 17, 2020)
The Timken Company has announced that renovations are complete and new services operational at the Philadelphia Gear Southeast Regional g... Read News
6 Rohm Offers Comprehensive Chuck Repair and Rebuild Services (February 1, 2018)
To better serve its customers, Röhm Products of America has made significant investments in its ability to offer comprehensive chuck... Read News
7 Bourn & Koch Legacy Machine Tools Can be Remanufactured, Retrofitted or Repaired (May 9, 2016)
Over the last four decades, through numerous acquisitions Bourn & Koch, Inc. has become the Original Equipment Manufacturer (OEM) for... Read News
8 Excel Gear Forms New Retrofit Division for Repairs and Upgrades of Old Machinery (July 9, 2015)
Excel Gear recently formed a new division of their company, Excel CNC Retrofit LLC, devoted to upgrading and remanufacturing older gear m... Read News