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The 8" will cut faster and produce more heat than a 6" for any given speed. The bench grinders you are using already spin too fast for buffing at 3450 rpm so using an 8" buff will just make that situation worse. Spinning too fast can burn the compounds and make them less effective. On soft handle materials this can mean actually removing material instead of just polishing it. The end result is blurred grind lines and a shiny but uneven surface.....
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