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I'm a newbie to using machines and saw someone using a DA and it looked pretty easy. For polishing a black car and trying to remove some spider webbing, would a DA or a PC work better for me ?
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The PC (a.k.a. G-100, 7424, 7335 or 7336) is a DA polisher. Are you asking about a different DA polisher? A pneumatic DA machine? A different electric DA machine?
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I see the acronyms DA and PC all over the boards and assumed they were different beasts. So are they both in essence "orbital polishers" ?Comment
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Yes, all DAs and the PC in particular, belong to the larger family of "orbital" machines. In fact, Porter-Cable refers to the PC as a Random-Orbit polisher/sander.
I was going to use this little graphic for a different discussion but it may be of use here. It shows the difference between an orbital and a rotary polisher.
All orbital machines will at least give a motion like the pad on the left. The whole pad moves around and any given spot on the pad makes a little circle. This is sort of like your hand does when polishing in a circle.
A rotary's pad moves around the center point as on the right so the outside spots on the pad are going much faster than the spots close to the center.
A DA (Dual Action) polisher is a certain type of orbital machine. It is different from the "jitterbug" type RO machines (like all orbital square-sheet sanders) in that the pad can also rotate around the center in addition to the orbiting.
They are still different from rotaries in that a DA pad is not forced to rotate but merely allowed to rotate. That's why they are much less aggressive than rotaries.
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Nice graphic Paul.Comment
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