Sharpmaker diamond rods?

This is quoted from Sal Glesser, in a thread over on Spyderco's own forum. I've bolded the pertinent part for emphasis. He refers to Spyderco's 'diamonds' sort of generically, but I'd assume it applies to the SM diamond rods as well:

(from site: http://www.spyderco.com/forums/show...ompared-to-DMT-extra-fine&p=395490#post395490 )
We've spent a great deal of time trying to determine grits for our stones. The manufacturer has also worked with us, to no avail. A guess seems to be best.

Most abrasives are measured by the grit size used in the matrix. Our ceramic doesn 't work that way. Grit size is constant.

We've tried to compare scratch patterns as Cliff mentioned and this is probably the closest, but nothing that we can say "This is blah blah". Then the Japanese water stones jump into the equation and suddenly there is whole new set of numbers.

So where we end up is:

Our diamonds are a 400 mesh (measureable). (600 on the Duckfoot)

Our gray stone is "medium". (Same material as fine but different carriers and heat treat).

Our fine stone is fine.

Our extra fine is a surface ground fine.



sal
Click to expand...

Assuming Spyderco's 'mesh' standard is the same as DMT's 'mesh' standard (and it may or may not be), Spyderco's 400 mesh would fall somewhere in between DMT's coarse (325 mesh; 45 micron) and fine (600 mesh; 25 micron).
 
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