I build motorcycle parts, including extremely intricate brake rotors out of 410 & 420 SS ( @ 38-41c ) 11 1/2" diameter. I have produced 'mirror like' finishes doing weird things including running course grit sand paper disks in my CNC mill with no coolant.

I have a reasonably good size (28" diameter platens,) Norton lapping machine and would like to know if anyone knows how to get a true mirror finish off of one of these using 3M sticky discs or anything of that nature that does NOT require paste or anything greasy. I know I'll need some kind of flush system to keep my discs from loading up and that is not a problem. My left hand is partially paralyzed and trying to clean the greasey stuff is incredibly difficult. I've done some preliminary testing and know it will work but I'd rather not take 4 months fine tuning it if someone has a better idea. I'm not sure which grits to start out with and what to finish with. The 3M lab had a sample and they sent it back saying they weren't sure how to do it. (LOL, it does work pretty good though on the small scale version I built but I really don't know anything about polishing flat discs.)

Additionally I don't mind if it takes a long time to lap, the cycle time means nothing to me since it runs unattended in a corner.

Thank you much~

Carl Stender