Joshua Nicoll
Plastic
- Joined
- Dec 19, 2020
Hello, recently when talking with someone, they mentioned they had very small beleved spur gears (metric module .8mm) and due to the high operating speeds (up to 25K RPM) the gears did not last too long. The gears in question are used to rotate a shaft 90° in a quite normal fashion, same tooth count just a direction and angle change, but due to have to be a small size, and with such wear, apparently they do not last long. The current gears in the technical drawing specify 65 HRC but knowing M42 can be between 68-70 got me wondering, would M42 be too brittle for such a use? My bandsaw uses M42 and I never noticed it being anymore brittle than high carbon blades, actually I thought it was less brittle, so would M42 be suitable for quite small high speed gears? I understand that making such small gears from M42 would be a nightmareish challenge but I like problem solving so wondered if in theory it would even work.