My first attempt with rotary and Zaino!

Maybe what Anthony O was referring to the heat generated due to a greater amount of pressure you can apply on a smaller surface.
 
Anthony Orosco said:
A bead of OCP about 4 to 6 inches long is overkill. You'll want to prime the pad the first time so place about a half dollar size amount on the pad (I place mine directly on the paint) and then begin polishing. After the initial application you'll want to only apply about a quarter size....I at times only apply about a nickel size....really depends on the area being polished.



One can safely run a rotary on a panel for 4 to 6 minutes as long as you move the polisher and are not above 1500 rpm's.



:idea Also remember that the larger diameter pad you use the lower the heat build up. The smaller diameter of pad the quicker you'll generate heat.



Anthony
Click to expand...



For a non US user how big are the coins mentioned?



Cheers



Rich
 
Whoa!





For Optimum polish, run the polisher @ 1200 rpm or if you're using a Makita, 2 notches below 3. Make 3 overlapping passes per bead of polish and all should work well.
 
merci said:
Maybe what Anthony O was referring to the heat generated due to a greater amount of pressure you can apply on a smaller surface.
Click to expand...





Rotary's don't work the same way as Dual Action machines. I don't know about the Makita, but the DeWalt(and all of it's variants), Milwaukee, Fein, and Metabo(I think) will not bog down under pressure, so the load would be constant. The inner 6.5" of an 8" pad will create as much heat as a regular 6.5" pad however, at 6.6"-8" there will be more heat created due to moving at a faster speed(not more revolutions, just inches covered per second).
 
Another quick Question guys I understand about keeping the rotary flat but what if its a curved surface :~ TIA!
 
Big pad vs. little pad.....



The heat build up issue and pad size has many variables. In a nutshell, a large pad disperses heat better to a larger area, a small pad will concentrate more heat to a smaller area.



A variable to this though is the size of backing plate. If you use a small backing plate with a large pad then you won't be using the full diameter of the pad but rather a slight portion just outside of the backing plate.



It is best to use a large backing plate with a large pad because of 1)heat and 2) product dispersion. So when using a 4 inch backing plate used with an 8 inch pad you aren't using the full 8 inches of the pad "contact" wise but only about a quarter of an inch or so beyond the 4 inch backing plate and you aren't able to then disperse the product through out the whole face of the pad.



So while the outer edges of a pad may spin faster it really doesn't matter because that portion of the pad may not be used in the first place.



Another variable is that a larger pad creates more drag. This is why a PC should not run a larger pad as it causes more drag which in turn creates more stress on the motor.



At any rate, no matter what size pad or backing plate you use, just keep the rpm's in check and keep them low. Most paints today are designed to respond to low heat/friction and only mild abrasives should be used on them.



Kevin Farrell and Ron Ketchum and I have talked at length about this very subject and they both agree that a small pad will generate more heat.



Anthony
 
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