HardWired II

[overkill]

What Glen said. I traced the design and ran some stress analysis with some mods:

The original shape with 20mm thickness:



As expected, the base of the tooth has plenty of stress and there is also some stress building up around the largest hole behind the tooth.

A modified shape with a small radius:



The small radius (about 5mm) doesn't do much to reduce stress. I made the two balancing holes a more equal size, which definitely reduces stress in that area.

The same thing with a large radius:



The large radius definitely helps! Another stress reducing change would be to reduce the hight of the tooth. I imaging you want to spin the disk pretty fast, so the tooth will never use all of that bite depth.