Quote Originally Posted by Sam Takeuchi View Post
6" at 3450 is 5419ft/m
8" at 1725 is 3613ft/m

That said, I have a slow speed 8", if I were buying again, I would have gone with high speed 6". But if you are afraid of burning the blade, might as well just buy slow speed grinder. It'll do anything high speed grinder will do, just slower.
That is greater than the numbers I have seen before. Did you calculate this? What is the ft/m speed for an 8" wheel at the circumference? This would give perspective to the 6" speed.

Regards from Perth

Derek