Thanks for the reply chromo. I wonder if I am understanding this clearly. Does my calculations make any sense?
I think I misread the buffing speed section then. I took the SFPM formula which is SFPM = 1/4 x diameter of wheel x RPM (revs of spindle per min).
(eg. 8" wheel @ 3600 RPM = 2 x 3600 = 7200SFPM)
For the rotozip I figured this:
1 x 4" = 15,000 SFPM <--- way over the recommended 3600-7500 SFPM.
Does this formula then generically apply to all buffing wheels then?
4" wheel X PI = 12.57" per rpm or about 1' per rpm. 2000' a minute at 2,000 rpm.
8" wheel X PI = 25.13" per rpm or about 2' per rpm 4000' a minute at 2,000 rpm.
12" wheel X PI = 37.70" per rpm or about 3' per rpm 6,000' a minute at 2,000 rpm.
Based on my math (which can't be accurate thinking about it now) If I were to use the rotozip with a 4" wheel I would be getting something like 15,000' a minute.
I think I am confused now, lol.
If I were to use my DeWalt Polisher with the adapter I would be inline with 3000 RPM if I used the 8" wheel.
I would probably avoid putting an 8" wheel on the rotozip just because I am pretty sure the shank would get bent especially if I have to apply pressure when polishing. Originally I also was under the impression that you really don't apply a lot of pressure on the wheel when polishing and it was more about just making contact.