. The 20th century toolsmith and steelworker; a complete, practical, and scientific book. AV Fig. 110. Flat and end views of circular blade for pipe cutter. Heating a Tool According to Its Shape. When heating, to harden tools of an irregular shapeas an eccentric ring. Fig. Ill, the heavy or thick side. Fig. 111. An eccentric ring. TOOLSMITH AND STEELWORKER 181 should be heated first, then allow the thin part to comeup to the heat gradually so as to avoid unequal con-traction when hardening. When quenching plunge theheaviest part of the tool into the water first. Making, Hardening and Tempering
. The 20th century toolsmith and steelworker; a complete, practical, and scientific book. AV Fig. 110. Flat and end views of circular blade for pipe cutter. Heating a Tool According to Its Shape. When heating, to harden tools of an irregular shapeas an eccentric ring. Fig. Ill, the heavy or thick side. Fig. 111. An eccentric ring. TOOLSMITH AND STEELWORKER 181 should be heated first, then allow the thin part to comeup to the heat gradually so as to avoid unequal con-traction when hardening. When quenching plunge theheaviest part of the tool into the water first. Making, Hardening and Tempering an Alligator PipeWrench. To make an alligator pipe wrench, take a piece offlat steel the size according to the size of wrench to bemade, heat and then fuller in as a, a, Fig. 112, after-wards drawing out the handle b, now cut off the fourcorners, as illustrated c, to shape as indicated by dot-ted lines with a thin splitting chisel which will givethe shape of the wrench. Now punch a small hole inthe wrench at d and cut out the part e as dotted the wrench is made where there is a machine shopthe teeth can be put in with a planer, but if made inan ordinary blacksmith shop the teeth will have to befiled in. The teeth can be put in one or both jaws, asmay be desired. Fig. 113 shows the com
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