Microns????

R

Requiescat in pace

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Apr 21, 2020
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Hi , would anyone be able to explain diamond paste microns compared to grit? I’m not sure what diamond compounds would be best.
Thank you
Steve
 
Microns is how the size of grains are individually measured. Different grit rating systems assign rating numbers according to certain standards for that grit, including average grit size and maximum permissible deviation. When a singular micron rating is given it can typically be presumed to be the average micron measurement of the grains. This is why different grit rating systems don't necessarily translate perfectly from one to another even when the average grain size is the same--the two systems likely have at least some small difference in the minimum and maximum micron sizes permitted in the particular grit. The major systems, ANSI (North America), JIS (Japanese), and FEPA F (European) standards for bonded abrasives diverge the larger the number used for the grit rating. In the coarse ranges they are closer to one another in equivalence. Grit standards and number ratings are often different between bonded (stones) and coated (sandpaper/grinding belt/diamond plate) abrasives.
 
In addition to what FortyTwoBlades said, not all stones of the same type are on the same scale - Choseras are clearly finer than Shaptons.
And in house standards may be more stringent than the rating scale.
 
Ourorboros said:
In addition to what FortyTwoBlades said, not all stones of the same type are on the same scale - Choseras are clearly finer than Shaptons.
And in house standards may be more stringent than the rating scale.
Click to expand...

Rather more specifically what you're describing is the difference in cut rate and finish produced vs. the grit rating, which is only one of many variables that affect those things. Grit type and grade, specific grain shape, grit protrusion, bond type, grit/bond ratio, density, porosity, and so on. They all impact the finish produced. At one point I had some prototype stones made for our sharpening stone line that were 4000 and 8000 FEPA F grit respectively but the 8k was a hard bond and the 4k was soft/muddy, and the 4k would produce a high mirror finish while the 8k made a more frosted surface finish (though it did produce a noticeable refinement of the edge itself.)
 
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