What are the pros and cons of using Vickers versus Knoop hardness testers for measuring case depth in carburized gears?

Continuing from my previous post... Perhaps I should have started this weeks’ blogs with these thoughts. But that may have allowed some of you e...

During the revision of ISO 1328-1:2013 Cylindrical gears — ISO system of flank tolerance classification, ISO Technical Committee TC 60 WG2 delegates discussed proposals that the standard should be modified to ensure that it is compatible with the ISO Geometrical Product Specification (GPS) series of standards (Refs. 1-3). This seems sensible because the gears are geometrical components, but after reviewing the implications, it was rejected because ISO TC 60 WG2 did not think the gear manufacturing industry was ready for such a radical change in measurement strategy. The feasibility of the implementation of gears into the GPS matrix of standards has been carried out and the results conclude that this is practical, provided some key issues related to measurement uncertainty and establishing appropriate KPIs are addressed.

The wear behavior of polymer gears made of five different materials has been investigated using an existing polymer gear test rig. Step loading tests at a constant speed of 1,000 rpm were performed. Significant differences in failure modes and performance have been observed for the five polymer gear materials for gear engagements of gears, with the same material as each other.

I had planned to attend the MPT Show in Detroit last week and participate in Gear Technology ‘s Ask the Expert panel, but...

Does nature hate a vacuum more than a designer hates a blank sheet of paper? We will never know for sure because nature is too busy to write a blog...