. The 20th century toolsmith and steelworker; a complete, practical, and scientific book. Fig. 39. The right hand bent cutting off tool. cording to the cutting edge, as illustrated by dottedlines in Figures 36 to 45, and tempered to a dark strawor copper color. But should the tools have to cut veryhard cast iron or other very hard material, harden anddraw no temper. Should the tool still fail to cut the TOOLSMITH AND STEELWORKER 93 metal, use equal parts of powdered cyanide of potas-sium and prussiate of potash. To use this compoundheat the tool as hot as if it was to be hardened, thenplace th
. The 20th century toolsmith and steelworker; a complete, practical, and scientific book. Fig. 39. The right hand bent cutting off tool. cording to the cutting edge, as illustrated by dottedlines in Figures 36 to 45, and tempered to a dark strawor copper color. But should the tools have to cut veryhard cast iron or other very hard material, harden anddraw no temper. Should the tool still fail to cut the TOOLSMITH AND STEELWORKER 93 metal, use equal parts of powdered cyanide of potas-sium and prussiate of potash. To use this compoundheat the tool as hot as if it was to be hardened, thenplace the heated, cutting edge of the tool into the pow-der, reheat again to a proper hardening heat andplunge into the hardening bath and cool off Fig. 40. The spring tool. When hardening large tools such as square corrugat-ing tools, and which have very fine teeth in the cuttingend, as indicated in Figure 46, make sure whenheating that the center of the cutting face is as hot asthe outside or corners. And never heat carelessly ortoo fast, so that the corners will be at a white heat. 7 Fig. 41. The left hand side tool. while the center is barely red. But heat slowly andvery evenly, until the whole face of the cutting end isjust hot enough to harden, then plunge into the hard-ening bath and cool off entirely. Draw no temper. 94 THE TWENTIETH CENTURY Heat slowly and evenly until the whole face of thecutting end is just hot enough to harden, then plungein the hardening bath and cool off. Ordinary corru-gating tools require no temper drawn. r Fig. 42. The inside boring tool. Air Hardening Steels for Lathe and Planer Tools. Cast steel for lathe and planer tools is to a certainextent done away with in large shops by the use of airor s
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