Before we leave our study of materials, I want to share a few thoughts on heat treating, lab tests, and hardness testing. When you start working wi...

Material Grade in Gears

Material Grade in Gears

The reason not all gears can be made from the same material grade has to do with hardenability. We have long unde...

Even the most brilliant gear design will fail if the wrong material is used to make the parts. Our understanding of metallurgy and alloying element...

Background on the development of a high-speed, automatic hardness tester for gear steels.

It was brought to my attention that the graphics used in my recent “herringbone” postings actually show double helical gears. I have a great suppor...