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I'm pretty sure the dremel with less surface area is going to heat up more rapidly, less surface area obviously equates to more heat as it doesn't have anywhere to go, whereas with a larger pad the...

Ah thats not too bad you can do the math like this I guess using those figures.

For the buffer:
(31 inches)(1750rotations) / (1 rotation)(1 minute) = 54250" per minute

For the dremel it...