Sorry I forgot a formula was here. What I meant was just you could adjust the surface speed on the part by size of the wheel staying at same rpms of the tool.
I was just giving examples, applies to anything round like a wheel.
If the outside of your car tire is 24" you move 24 X PI= 75.4" or 6.28' each time the wheel goes around 1 full turn.
Formula,
"SFPM = 1/4 x diameter of wheel x RPM (revs of spindle per min).
recommended 3600-7500 SFPM"
1/4 X 4" wheel = 1 X 15,000rpm = 15,000sfpm that's 2X to fast, so half that size wheel?
1/4 X 2" wheel = 0.5 X 15,000rpm = 7500sfpm so max is 2" wheel,
1" wheel would be half that and at 3750sfpm is near the low
So if I figured that right, the 15,000rpm rotozip needs about 1-2" wheel.
2" should work fine on a 1/4" shaft.
Not used it yet, but I was at a close out store and bought a nice buffing kit for a drill, has a 1/4" shaft, 2", 3", 4" cotton wheels and 4 little bars of compound (one each type).
I think Caswell sells something similar (but better quality) and they have the aluminum wheel kits also.
A 4" wheel on the polisher should run 3000sfpm on high speed, just under the recommended low of 3600sfpm so would probably work.
You do have to apply some pressure to make the compounds work and this will bog down a motor and the larger the wheel the more it will bog down. I don't know what your polisher is,
The online buffing book shows a 1/4hp motor should run a 8" wheel at 0.5" wide. There is a typo there, it shows 5" but it should be 0.5" I am sure
If you haven't read it yet,
http://caswellplating.com/buffs/buffman.htm you should download it and read through it. Nice online book/manaul.