OldTools Archive

Recent Bios FAQ

262341 Erik Levin 2017‑05‑23 Re: open question: diamond grit
Don Schwartz engaged us with:
>I'm not certain of this, but I don't believe you can directly compare 
>the effects of high speed vs hand speed grinding or sanding with a 
>particular grit. Size matters, but so does speed! I am not a grinding expert,
but have done a fair bit and understand this to be correct.

Other things that matter include how the grit is bound (binder type and
hardness), the sharpness of the grit, the hardness of the grit, and the density
of the grit in the binder. I have achieved near mirror finish with wheels of
120grit under the proper circumstances (slow passes and very light cut), needing
only final finishing. I believe that it is roughly (pun intended) the number of
points presented to the work in the desired plane, not the actual grit size, and
a properly dressed course wheel presents many, many points in precise relation
in a short time.

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Recent Bios FAQ