I'm going to finish the grinder, I changed a little the project, due to add more simplicity on engine pulley. I can't do a good job with broaching, so I decided to make some holes with grains to link the pulley with engine.
I have to build a sort of frame for motor, and maybe add some reinforcement.
A couple of pictures as usual
With the combination of wheels (4" motor - 3" Others) and 2800 rpm, I should have 2932.2 ft / min according to calculator, it's about 15 m\s. According to 3M manual it's good for titanium, I should need 5 more m\s for perfect work. A 6" wheel can fix the problem, reaching about 22m\s - 4300 ft \ min, But i'm not happy to make a large wheel now, because I need large round aluminum bar, maybe in the future if the grinder will be not enough.
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