Should i get 5.5'' pads or 6.5'' with a PC starter kit? What is the difference other than 1''? LOL.
Let's talk size!!
The 6 1/2" diameter pads a
Porter Cable 7424 in my opinion pushes the limit of the machine and this could be part of the problem.
I have the same machine and found a world of difference when I decided to try
Lake Country 5 1/2 diameter pads.
The
Porter Cable 7424 style dual action polisher
should come standard with 5 1/2 inch pads and corresponding backing plate.
Pads & Friction
The size or surface area does not directly affect the frictional force between two surfaces until downward force or pressure is applied. Reducing the pad size will only improve the mechanical efficiency of the machine.
The motor of your polisher produces some amount of power. The larger the pad surface area the harder the motor must work. Now, most will say "it's only 1 extra inch", but when it comes to surface area and friction your really talking about an additional 10 square inches. Now take a look at the difference between the 5 1/2", 6 1/2" and 7" pad...........Size does matter!
Surface Area - 5 1/2 pad = 23.75 in²
Surface Area - 6 1/2 pad = 33.18 in²
Surface Area - 7 pad = 38.484 in²
There is a direct relationship between the pad surface area and the polishers ability to transfer adequate power to the pad improving it's overall performance.
Go back to my post above and click in the pad link I provided...

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