My PC doesnt spin a whole lot

Bowens99gt · 05-12-05, 09:17

I've always wondered why it doesnt spin as fast as I think it should. Like if theres a mark on the backing plate or something I can see it go around but it sure isnt as fast as I think it should be. The whole thing shakes and what not. It seems like a regular buffer that vibrates. I got the one from lowe's. Do I need a different counterweight? Or is this normal?

thanks

Brandon

Eliot Ness · 05-12-05, 09:43

That's pretty much normal with a PC. If you don't apply as much pressure you'll notice that it rotates a bit more, apply too much pressure and all it will do is sort of "jiggle". Larger pads (like 7.5")will also bog the PC down more than 6/6.5" pads.

The motion of the PC (OPM's) rather than straight RPM's like a rotary is also the reason it is so safe for paint. The higher speeds of the rotary make it much easier to burn through paint if you aren't careful.

beeste · 05-13-05, 03:21

I too am really confused by this. I hardly need any pressure for it to stop spinning. In fact it stops spinning under its own weight. What's the point of the spinning if it stops this easily? Or is my PC broken?

treebiter · 05-13-05, 06:18

At higher RPMs I've found that it looks like it isn't spinning, but that it's just an optical illusion. Of course, with pressure it does become bogged down and stop spinning at well.

ebpcivicsi · 05-13-05, 06:23

Try placing pressure on the head of the machine and remove the handle. If at any time the weight becomes unbalanced it will "jiggle." It takes practice, but applying equal pressure to the PC while keeping it balanced will still allow it to spin at higher speeds with pressure. I used a grease pencil to mark the BP when I first got my PC. It took a little while to perfect the technique, but it is just muscle memory now. Give it a try.

brwill2005 · 05-13-05, 08:08

Like the others stated, a PC does not really "spin", it oscillates. It is an eliptical motion. If it was a rotary and did not spin, you would definitely need to be concerned. My mini Wen orbital also appears as if it is not "spinning".

Accumulator · 05-13-05, 09:12

It' supposed to both spin/rotate *and* oscillate; that's the "dual action" motion. Yeah, the PC bogs down very easily and then it just "jiggles" (oscillates). That's a downside to polishing paint with something that was designed for use as a finish sander on wood (where you do *not* apply pressure; you let the sandpaper do the work).

Using a 4" pad will help immensely.

If you want a D/A polisher that won't bog down, get a Cyclo

percynjpn · 05-15-05, 06:12

Quote:

Originally posted by Accumulator
It' supposed to both spin/rotate *and* oscillate; that's the "dual action" motion. Yeah, the PC bogs down very easily and then it just "jiggles" (oscillates). That's a downside to polishing paint with something that was designed for use as a finish sander on wood (where you do *not* apply pressure; you let the sandpaper do the work).

Using a 4" pad will help immensely.

If you want a D/A polisher that won't bog down, get a Cyclo

Accumulator, if I use 4" pads on my (locally made) polisher, do I need a different backing plate, or is it ok with the 5 1/2" plate already on it? Thanks.

sQuashed · 05-15-05, 06:55

You will need the smaller backing plate for the 4 inch pads. Here's a PIC of the setup.

Accumulator · 05-15-05, 10:32

Yeah, use the smaller plate.

beeste · 05-15-05, 12:38

sorry if this sounds dumb but why would autopia sell these with the 6" pads and not 4", if the larger pads stop the PC from spinning like it is supposed to?

JBM · 05-15-05, 01:06

Quote:

sorry if this sounds dumb but why would autopia sell these with the 6" pads and not 4", if the larger pads stop the PC from spinning like it is supposed to?

By these do you mean the PC?

6 1/2" pads certainly can remove defects, infact people have gone through clear and into the primer to illistrate a point.

The harder pads such as my orange DAS pad spins like crazy even on 5. On 6 it is a beast.

The softer pads require perfect centered pressure to get a rotation.

Truth is, if one is using one of the softer pads, then a jiggle may be all is needed anyhow.

The 4" spot pads require alittle more attention to prevent a problem from occuring. Not anywhere near as much as a rotary, but the little pads will heat up, burn paint on rubber bumpers, or rub a hole through the clear coat(with multiple attempts at removing a scratch that should be left alone), unless you know what you are doing.

That doesnt mean an MIT degree either, just common sense, and an idea of the products capabilities.