PC vs Rotary

[former86camaro]

I have the PC and I have the Chicago Electric Rotary (LOL).



A buddy asked me “how can a rotary that moves at slower speeds be better at defect removal?�





My first assumption is because it works a smaller spot generating more action and heat on that spot?





Please help me explain the benefit of the rotary in layman’s terms.





I use mine when the swirls are bad on cars, but I get a lot of sling and usually the effort of it does not seem worth it. Most likely it is the Cheap Rotary.

[imported_Sullybob]

The rotary is direct drive and the PC is a random orbital drive. So all of the force from the rotary is concentrated in one spot (like a drill) where the PC moves in a random orbital pattern (simulating your hand) spreading out the force and the heat.

[the other pc]

...A buddy asked me “how can a rotary that moves at slower speeds be better at defect removal?�...He’s confusing motor speed with pad speed. They`re not the same thing.



With an orbital, every point on the pad moves in an arc the size of the orbit, which is only a fraction of an inch.



With a rotary the speed at which any point on the pads moves is proportional to its distance from the center. That’s up to a six inch diameter arc for a six inch pad, an eight inch diameter arc for eight inch pad, etc.



So if a point on an orbital pad is moving at four times the rpm`s but the distance to that same point on a rotary pad is forty times the diameter of the orbital`s orbit, the point on the rotary pad is still moving along the paint at tens times the speed as on the orbital.



http://archive.meguiarsonline.com/forums/photopost/data/500/orbit_vs_DA_vs_rotary.jpg





PC.