What do glam and avant garde rock star Brian Eno, AGMA and Seattle Gear Works have in common? Admittedly, not much. But there is a connection of sorts.
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.
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.
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.
Results from the Technical University
of Munich were presented in a previous technical article (see Ref. 4). This
paper presents the results of Ruhr University Bochum. Both research groups
concluded that superfinishing is one of the most powerful technologies for
significantly increasing the load-carrying capacity of gear flanks.
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.
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.