Hi faithful and patient reader…
Just recently I was asked about the diamond stuff I sell, and what ‘grit’ they actually are. And I couldn’t reliably say, so the next best thing was to take a few pictures of the various things and let them speak for themselves.
You see the problem is that there are several grit scales in use, rarely does any manufacturer openly state which scale/standard they are using so the question of ‘grit size’ is a bit of a mine field. Is it “mesh size”, is it “JIS” (Japan Industrial Standard) and if JIS, which standard, R6001-1977 or R6001-1988 or R6001-1996? They’re all a little different, but all can be rightly labelled #**** grit size.
So, a few simple pictures of the various diamond doohickeys out there, taken at 250x with a simple USB microscope.
iWood, #300
iWood, #1000
Atoma Economy, #400. Human hair for scale.
DMT #325 (coarse), human hair for scale.
DMT #600 (fine), human hair for scale.
iWood #400 (Special, not for sale), human hair for scale.
iWood #1000 (Special, not for sale), human hair for scale.
iWood medium grade saw sharpening file, human hair for scale.
I don’t know if these are useful or not, but it might go some way to explaining the small factoid…
Grits aint grits!
Stu.
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Most interesting the way the little Atoma diamond blobs show up.
Same for the iwood and DMT. Despite the different numbers, they look a lot the same.