Читать книгу Mike Darlow's Woodturning Series: Useful Woodturning Projects - Mike Darlow - Страница 33

Although a high-speed (3,000 rpm) grinder with, say, an 80-grit wheel is fine for approximate shaping of small woodturning tool noses, it’s rather aggressive for regrinding. A slow-speed grinder with a finer, say 120- or 160-grit wheel would be better. If, like me, you don’t have this facility, a coarse diamond file can be employed for refining the nose form before honing with a fine-grained diamond file or slip stone. (As Alan Lacer and Jeryl Wright have shown in their article “Does Honing Pay Off?”, diamond is the preferred honing abrasive for HSS because of the presence of very hard nonferrous carbides in the steel.)¹ Diamond-coated slipstones are available, but you’ll probably have to source an aluminium oxide (figure 2.13) or silicon carbide slipstone for honing flutes with very small radiuses.

Figure 2.13 Hones for small-nosed turning tools. Left to right: a Norton FS-24 aluminium oxide India slipstone, a diamond-coated slipstone with slightly larger edge radii, a superfine-grained diamond file, and a coarse-grained diamond file.