- Joined
- May 6, 2014
- Messages
- 220
The final one I made has 40 teeth so it will have the desired 40:1 ratio. Hobbing a gear is tricky - even if the gear diameter is correct, it doesn't take much for the teeth to wander initially in the process, resulting in 39 or 41 teeth when you are shooting for 40. A more pronounced (and controllable) gashing operation will prevent that.