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Folks, there's no need to work so hard!
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! Enjoy gents. :w
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Grit, Mesh and Particle size
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 this thread above. It is a logarithmic power law equation and when expressed as such it has a better than 99% fit. It isn't simple but it can be understood. As you can see, though many have asserted that a Belgian Blue has a 4000 grit and a Coticule an 8000 grit, the actual grit that relates to these stones is more like 1200 to 1800.