Reply To: Sharpening for luthiers
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It’s really hard to have these discussions without certain details. Specifying a grit without specifying a grit system makes it close to impossible to cary on. As Larry pointed out, some abrasive surfaces aren’t sieved and are mixed in nature, and don’t have a grit number.
I’m afraid the honest answer here is that, if the OP is interested in learning how to sharpen for lutherie, Paul’s informal comments aren’t going to be very helpful and the best bet would be to find a lutherie forum or a luther to ask directly. Why waste time guessing if you want to go further with instrument making? Of course, one should ask what is the dominant effect on sound. The species of wood? The climate of the specific tree and its specific grain structure? The carved profile and overall mass? The grit of the sharpening stone?