. The 20th century toolsmith and steelworker; a complete, practical, and scientific book. or sharpened, but this workis very little understood by the average blacksmithand so the tool fails to give good results, it being toosoft or otherwise the heel will break off.^ To dress, heat the whole end of the pinch bar to agood yellow heat but not necessarily very far back, andthen dress to the shape of Fig. 97. To harden, heatthe face of the tool from heel to point to about 1 TOOLSMITH AND STEELWORKER 169 inch back to a very even cherry red, being careful notto get the heel overheated, then dip in t
. The 20th century toolsmith and steelworker; a complete, practical, and scientific book. or sharpened, but this workis very little understood by the average blacksmithand so the tool fails to give good results, it being toosoft or otherwise the heel will break off.^ To dress, heat the whole end of the pinch bar to agood yellow heat but not necessarily very far back, andthen dress to the shape of Fig. 97. To harden, heatthe face of the tool from heel to point to about 1 TOOLSMITH AND STEELWORKER 169 inch back to a very even cherry red, being careful notto get the heel overheated, then dip in the harden-ing bath to 11/2 inches back at an angle as indicated bydotted line in figure. Now polish the heel and sidebright and draw the temper, by placing the part be-tween a and b directly over the fire, heat slowly anddraw the point to a blue temper, but keep the heel asindicated by c cooled off by occasionally dipping it inwater to the depth, as illustrated by dotted line (asthe heel cannot be too hard when properly hardened)while drawing the temper at the point, then cool off n^. b Fig. 97. Correct shape of punch bar and you have dressed a pinch bar that will give un-limited satisfaction. There are different kinds or shapes of pinch bars, butthe one as illustrated in Fig. 97 has been found bypractical experience to be the best, as it is very one illustrated in Fig. 98 is perhaps more com-monly made and used, but the fault of this pinch baris, it is not heavy or strong enough at the point, con-sequently when moving heavy or loaded cars the pointis very apt to bend or break. When hardening a pinchbar, as Fig. 98, harden the heel only, as the point willbreak if hardened or tempered. If at any time it isnecessary to put a new heel on a pinch bar, upset the 170 THE TWENTIETH CENTURY steel to the shape of Fig. 99, then forge to shape. Theillustration as Fig. 99 will also apply when making newpinch bars. zz
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