Hand Tools Archive

Re: Nuance..
Response To:
Nuance.. ()

> Who really knows how much all of this matters - 15 years on or so, I saw this only because I was looking through the scope. The only thing I know for sure is that once someone looks at an edge through magnification, the "this edge is good, the last wasn't quite as good, etc - that variance is gone".

The reason I started heading down this path of trying to create a hollow on the back of the blade is because, since I started buffing my blades, I've gotten accustomed to much sharper, more uniform edges. The surface from planing with a freshly-sharpened (and buffed) blade is incredibly smooth.

However, with bevel-down planes, I did notice some inconsistency with the resulting planed surface when I sharpened this way. It was probably more noticeable because when the edge is good, the surface is flawless, and I've gotten used to the idea that I can easily achieve that.

I think the cause of the inconsistency in sharpening with a bevel down plane blades is because of (A) the wear on the back of the blade makes it harder to hone that side, so it's more likely for a bit of burr to remain, and (B) I try to only do minimal buffing on these blades, to maintain clearance, so if there is a bit of burr left on the blade by the time it gets to the buffer, it's less likely to be fully removed.

Since I started applying more pressure near the edge when working the back of the blade, that has pretty much eliminated the inconsistencies in buffing BD plane blades for me -- even though (as seen in the picture of a bit of light reflection) there may be still a bit of convexity right at the edge. Note that in my case, I'm using a waterstone, so in addition to the extra pressure near the edge, the slurry and softness of the stone probably helps it to abrade any burr despite the remaining convexity.

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