On 30 Oct 2005 06:34:17 -0800, with neither quill nor qualm, "Dave"
quickly quoth:

Anyone know how different grades of wet/dry sandpaper relate to the
scratch depth they leave behind? I realize scratch depth must be very
material specific but my interest would be mostly 6061 aluminum and
mild steel. To phrase this question another way -- how much material
would have to be removed to mirror polish out the scratches from 400,
600, 800 grit? Thanks.

Your question is somewhat subjective, Dave. Dings and other scratches
will determine the final material removal, not just optimal scratches
from optimal grit sizes.

OTOH, does this help? It's the best chart I've seen for grit sizing.
http://users.ameritech.net/knives/grits.htm


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