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Originally Posted by chcustom
Good point mpierich, just today we did a polishing job on a set of triple trees and started out with 240 grit. They were already fairly polished but just had a few deeper scratches. It really all depends on the condition of the metal at the start. Some of the old Triumph and Shovelhead covers that we have done had 1/8 to 1/4 inch deep gouges in them. At that point you really have no choice but to start at 80 sometimes even 40 or 60 grit
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Yeah, my last piece I started with 320. I often use 80 for isolated areas. And I have sometimes gone first to the angle grinder to remove lettering and unwanted bosses - the main thing is, anyplace you don't need a heavy grit, don't use it. I guess my comment was to say that for smoothing an extensive sand-cast surface, for me the 120 is plenty fast.