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Originally Posted by ptim
Thanks for the info, If the bench grinder isnt strong enough, what about an angle grinder.
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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.