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Originally Posted by mpierich
Personally I'm not sure how these angle grinders are being used. Surely they exceed the rpm limits for normal cotton wheels, and 20,000 - 30,000 rpm is, um, overkill for simply polishing. But, as the name implies, they are the best for grinding...which is what they're made for.
If these valve covers are all you're doing, you can do it with the drill - it'll just take a while. After all, Caswell sells a kit just for using a drill, so they must think it works...
If you're going to do very many more parts, _then_ it might be worth it to get better equipment.
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My Dewalt Grinder is 11,000 rpm's, I ordered an adapter and a few pads from Caswell. My drill was'nt getting it done. It is only pushing around 3,000 rpm's, I probably put about 5 hours on just one of my covers.