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03-26-2007, 08:15 PM
| | Senior Member | | Join Date: Sep 2006 Location: Muskegon, Michigan
Posts: 506
| | | This is how the PC really works
There was a thread several weeks ago where someone was concerned because their PC was not spinning after some pressure. This led into a debate amongst a few of us on how the PC 7424/7336 really works. Some are under the misconception that the machine actually is supposed to spin the pad on a single axis like a rotary, or else it is faulty. I emailed Dewalt to ask about how the machine really works, and finally after several weeks I actually got a reply:
Subject Please clarify function of the 7424/7336 Discussion Thread Response (Stacie)03/14/2007 10:38 AM Dear Doug,
The term "random orbit" means the disk moves out of the plane line of the motor. The pad is not connected directly to the motor. The rpm of the pad on a flat surface is 1 to 300 RPM. it is possible there will be no rotation and/or the rotation can be in either direction. This makes the sander much more aggressive than non random orbit sanders without creating the swirl marks one would expect with disc sanders.
One misconception of the 7424 is that it is not a buffer. It is an applicator of the wax/polisher and mimics the swirl motion of your hand while applying product.
Regards,
End User Services
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Last edited by Grimm : 06-02-2007 at 08:15 PM.
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03-26-2007, 08:28 PM
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Posts: 1,151
| | | pff, not a buffer...
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03-26-2007, 08:41 PM
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Posts: 1,230
| | I dunno... I think it is. its not officially a buffer as it wasnt meant to be.
but: 
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03-26-2007, 08:45 PM
| | Senior Member | | Join Date: Mar 2006 Location: New Jersey
Posts: 325
| | | Well, technically, it started out life as a random orbit sander. You could take the sander with the velcro pad and then put any velcro buffing pad on it. For that matter, you could buy any random orbit sander from Lowes, Sears, or Home Depot and slap a polishing pad on it and it would work.
I think totoland uses a Festool "random orbit" sander...pretty much the creme de la creme of sanders. |
03-26-2007, 08:46 PM
| | Senior Member | | Join Date: Mar 2006 Location: New Jersey
Posts: 325
| | | BTW, it's the random orbit nature of the machine that helps to prevent it from generating so much heat on one spot and burning the paint. |
03-26-2007, 08:48 PM
|  | Senior Member | | Join Date: Feb 2007
Posts: 802
| | | the pc's original use was for furniture and wood finishing...i used to use them when I made tables and cabinets...FINISH sanding was its main duty as it could do 3000 oscillation to my 2-3 hundred...and it did a great job of buffing and burnishing waxes and stains on flat table tops...the car enthusiat crowd picked up on the pc and then started designing/creating/modifying wool and then eventually foam pads to be used with the pc... |
03-26-2007, 08:53 PM
|  | Senior Member | | Join Date: Dec 2006 Location: Orlando, FL
Posts: 1,272
| | Quote: |
Originally Posted by nick19 These polishers are characterized by the motion of the head. It spins on a central spindle, but unlike a rotary polisher, this spindle rotates around an eccentric offset. On a PC, this produces a jiggling motion. This irregular motion prevents the polisher from burning the paint, which refers to removal of paint below the clear coat surface. Dual action polishers are very USER FRIENDLY as a result of this feature.
The same safety feature which reduces the possibility of damage from a PC also prevents it from removing deep scratches. While a PC will improve the appearance of scratches and remove light swirls, it cannot cut or damage the paint.
If you need more thorough scratch removal, this will require a rotary. Keep in mind, rotary polishers in inexperienced hands can damage the clear coat and run the risk of a serious PAINT BURN. A rotary polisher SHOULD NOT be used by a novice.
On the plus side, dual action polishers will improve the texture and luster of automotive paint with minimal risk.
Hope this helps...
-Nick  |
From another I posted about... this is in simplest terms what the PC is and how it works. |
03-26-2007, 09:12 PM
| | Senior Member | | Join Date: Sep 2006 Location: Muskegon, Michigan
Posts: 506
| | Well technically I suppose the PC isn't a polisher. Considering how much effort it requires compared to a rotary, it's sort of like using a sander to plane a board instead of a planer. Eventually you can do it, but it will take longer, more work, and you might not be totally satisfied with the results. 
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03-26-2007, 11:52 PM
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Posts: 432
| | | oh dogshit, it removes any swirls that I have, so as far as I'm concerned, it's a polisher.
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03-27-2007, 12:55 AM
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