Thread: The science of grit numbers

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

Consider the Suehiro 20K with 0.50 micron "grit" size and the Shapton 30K at 0.49 micron. Bluesman hit the nail right between the eyes.


rs,
Tack

We've tried this before and as Utopian says it depends on the data you use, which in turn depends (it seems) on the manufacturer (and perhaps on their marketing division..!)

Just for some interesting reading, take a look at this thread from ages ago. I kinda went a bit overboard for some people's tastes, but perhaps you'll find it interesting...

And a good post about some of the important stuff around the behaviour of stones and grit: http://straightrazorpalace.com/honin...tml#post248353

James.

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 the exponent to be -1. After that I got a numerator of 20k instead of the 14.8k you got.

I realise now that this doesn't tell the whole story (not by half!), but it was at least fun doing the maths
(Yeah, I'm a huge nerd!)