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spherical shape rubber abrasive?

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petertha

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Has anyone seen a supplier of ball ended rubberized abrasives? Kind of like what these diamond abrasive profiles are, but made from rubber-like abrasive like the green ones? I can somewhat form a ball by sacrificing a cylindrical profile using a dressing stick, but not very well. I tried searching ebay under dental tools & such. Maybe they don't even exist, but thought I'd ask.
 

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petertha

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Ya, I probably should have specified. An ideal ball size for this application is maybe only 2-3mm diameter. That's why the diamond ones have their shank necked down so a more full ball surface is available. I can make a bullet roundover shape on the rubber abrasive but a sphere isn't really practical.

This particular application is an oil port through hole with occasional remnants of burr on the inside. I don't want to mess up the main reamed hole by passing an abrasive through it. So I've just been turning the fine grit diamond ball by hand against the port hole edge with shank at an angle to achieve a slight equivalent of chamfer on the inside. Its done now but I seem to run into this issue so figured maybe there was a better tool for the job. I like how these rubber abrasives work on fiddly surfaces, quite controlled on aluminum.
 

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PCT

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Has anyone seen a supplier of ball ended rubberized abrasives? Kind of like what these diamond abrasive profiles are, but made from rubber-like abrasive like the green ones? I can somewhat form a ball by sacrificing a cylindrical profile using a dressing stick, but not very well. I tried searching ebay under dental tools & such. Maybe they don't even exist, but thought I'd ask.
McMaster-Carr has them.
 

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