Reddit reviews PHYHOO Polishing Buffing Wheels Wool Felt Mounted Mandrel Grinding Bits Grinder Head Polish Watch Jewelry Rotary Tool Accessories Drill Tools Attachment - 1/8 Inch Shank
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Pack of 20 Pieces of Rotary tool accessories, felt-tippedThe diameter of whole felts' shank is 1/8"(3mm)With 10 cylinder shaped grinding heads, 10 bullet shaped, different sizes of headsMake polished goods clean and bright, best used for various mould, glass, medical equipment, metal, and many moreIdeal for the rotary grinding and polishing tool
I'm not sure if this is sarcasm because the idea is thought to be stupid. Or genuine because the idea is good.
All I know is that it works well for me.
I place the bearing on a MYY bearing remover, and using the cone shaped polishing bit seen here, I touch the dremel to the outer race and spin away. I feel this is fairly safe if you use standard power tool safety precautions. I always wear my glasses!
I don't really know. I've never had very good luck with the stones. I think the most useful dremel accessories for grinding away material is either use the sanding drums like these or use rasps/burrs coated in diamond or tungsten carbide like these.
For the brushes, the silver ones are steel or stainless steel, and the brown ones are usually brass. They'll have different effects on different materials based on the hardness. I've used the stainless brushes on steel before to clean it and kind of give it a texture.
For buffing/polishing of things like painted surfaces you'll want something like this or this and some sort of buffing compound. Most dremel accessory kits usually come with 1 or 2 buffing attachments.