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BTW, I was writing my latest post as Howard published his. It should be clear that he and I are saying the same thing in different ways. Great post Bart!!!

Quick, the American Standard Grit is one of several standard grit systems. even the two examples that you cite:

Shapton (glass) 8000: 1.84u
Norton (water) 8000: 3u

fit within the AMG in that...

I posted a conversion table of American grit, Mesh and Particle size earlier in this thread. The mesh numbers are the range of particle sizes in microns since meshes at these small sizes don't exist....

Grit is a measure of the particles that go through a certain size mesh and as such can be related to a particle size. The relationship can be derived from the chart I published in my first post to...

There are standard ways to relate Grit, Mesh and Particle Size. Please see the table below, it's just that simple. Bart, please don't burn up your slide rule on this one, it has all been worked out!...