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Thanks Jimbo, that fitting technique was exactly what I did to get my rule-of-thumb formula. The only difference is that I noticed that -0.9 was pretty close to -1, and so I re-did the fit forcing...

I suppose you're right. Far too many unknowns. Thanks anyway!

That's a pity. Do you know anywhere I could get data on the various manufacturers?

Searching around google for information on grit numbers, I can only find tables like this -- Grit = Micron = Mesh Conversion Chart

Using a bit of maths, it seems to me that the size of the...