Hand Tools

Subject:
Re: We will be going 100% sharpening perv...

Patrick Chase
Sorry about the double-reply, but...

w.r.t. saws I agree completely, unless we're talking about "one-shot" impulse-hardened blades of course. Most saw files have surface hardness somewhere in the low/mid Rc60s, and can easily handle sawplates up to Rc50, and a bit more with exceptional filing technique. The hardest three-square needle files on the market (Glardon-Vallorbe Valtitan, Corradi Corinox) are Rc72 and can handle objects up to the (very) low Rc60s.

We had one of those discussions on The Other Forum recently, with fairly extravagant claims about the hardness of D12s in particular. One complication was that one of the people claiming high measurements was Pete Taran, who's forgotten more about saws than I will ever know, so it was difficult to resolve the apparent contradiction. I suspect an apparatus/measurement issue. He was using a Rockwell surface hardness tester and applying C-scale conversions that assume homogeneity, so it's possible that his saws were simply face-hardened.

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We will be going 100% sharpening perv...
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what microscope?
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Evaluation
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