Hand Tools Archive

What happens to worn diamonds

Jack Guzman from Maine
I bought a diamond sharpening plate at rockler about ten years ago. I believe it is 400 grit. This is not one of those plates with the round holes in it but a solid flat plate with a consistent surface. I've used it to flatten waterstones and flatten the backs of chisels and the soles of small handplanes.It has seem much use in the ten years I've had it.
I seem to remember reading somewhere that these plates change with use to a finer grit. Is this a fairy tale or is there any truth to it? Do the diamonds break down into smaller particles or something similar? It seems to me to leave a smoother surface that it used to. Am I imagining this?---Jack

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