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Again here comes the vague answer, of as many as it takes, but in reality somewhere between 30-100...There are just to many variables to try and get closer than that.. Sorry


Actually Tom's...

Now that side of the equation would be very very interesting to me, with actual pics of the stone surface at high mag...
Now this is getting way more interesting :) I wonder if you could quantify...

I think that is a great idea, but even that has a limitation as depth,,, All things being equal a slight difference in pressure/direction would change the depth of the scratch patterns... Zowada has...