Читать книгу The Handyman's Book of Tools, Materials, and Processes Employed in Woodworking - Paul N. Hasluck - Страница 147

When a plane iron, chisel, or other edge tool has been sharpened on the oilstone a number of times, the edge becomes thick. There is too much metal for the oilstone to remove, so the grindstone has to be employed. The grindstone is not a tool for producing a cutting edge, but one for removing a superfluous thickness of metal, yet in nine cases out of ten tools are ground right up to the edge, and often there is 1/16 in, of wire edge to be removed by the oilstone, this being entirely waste. The grindstone should never be allowed to work quite up to the cutting edge of the tool unless it is to remove a gap.