s are largelytaking the place of grindstones for this purpose. Greatercare is necessary in the use of emery wheels than withgrindstones for grinding WOOd-WOrkJn^ tools, for thewedge being thin, the temper of the steel is very liableto be drawn by the heat generated by the friction. Ingrinding a… … Fig. 46.on the stone during the process of grinding. The waterserves two purposes; one is to reduce the temperaturegenerated by friction, the other to keep the stone cleanor to carry off the particles of sand and metal loosened inthe process of grinding. The surface produced by thegrinding is…
Patternmaking
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