SHARPENING CHISELS.

Otago Witness, Issue 1230, 17 July 1875, Page 3

SHARPENING CHISELS.

Sharpness in the tools is of paramount importance. In all chisels, &c, except tiiose few that are made of solid steel one side of the Made (the cutting ed»e)' is made of steel, while the other is of iron Double-bevelled chisels, or "formers '"' have a layer of steel centrally, encased on both sides by a layer of iron In gouges, the steel forms the inner layer the iron the outer. *

In grinding any of these tools, we always seek to produce an edge by wearing away the iron face, and part of the steel, great care being taken not to upset the "back" or steel aide. The an^le which must be given t,. the bevel of t°h c tool will depend entirely on the hardness of the wood upon which the work is to be performed j the hard, r the wood, the more obtuae being the cutting angle. For general purposes, an angle of from 25 cleg, to 30 deg. will bo found serviceable. Whether sharpened on a grindstone, or on slab, great care must be taken that the face be kept quite level ; otherwise the edge comes out rouuded instead of flat and the tool penetratoa with far greater difficulty into the wood.