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Rims too tight -- sandpaper them down?

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Rims too tight -- sandpaper them down?

Old 09-27-22, 08:56 AM
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Originally Posted by JohnDThompson View Post
Not with an aluminum rim. Aluminum doesn't spark, and it will clog your grinding wheel, increasing risk of thermal cracking and shrapnel later on.
I wrote to Norton about this several years ago in the process of putting together a shop safety document. Their response, in short, was that while you will clog the wheel and need to dress it, that the exploding wheel thing, due to aluminum, is an unreasonable concern invented in academia.
Cracked wheels due to prior impact damage can separate and are a serious risk, but thatís a separate issue. They advised that the only way to overheat a wheel with aluminum would be to coat the entire wheel surface and then keep leaning into it for a long time after it had ceased cutting.
While energy is no longer being removed by the slag (because you arenít cutting), grinder wheels are not designed to fail when fully utilizing the output power of the motor, regardless of the material being worked.
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Old 09-27-22, 12:06 PM
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Definitely don't try to modify the rims. I had this problem with some MA40s and Zaffiros, although I didn't take it as far as breaking plastic levers - I just bought some decent steel levers and the tyres surrendered. I never encountered this problem when I was working as a mechanic, at least not to this extent; I tried lube and toe straps, one or both of which are normally the solution in this situation, but when brute force seems the only solution then that's what I'll use.
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