220 



BLACKSMITHING 



191. Working Instructions for Cold Chisel. 



Stock: One piece 3/4", six- or eight-sided tool steel, 



7-1/2" long. 

 1) Heat 1" of one end of stock to lemon glow and round to 



Q 



FIG. 223. Cold chisels. 



cone, shape, leaving 3/8" flat on end in 

 form of circle. Keep circular flat end cen- 

 tered on axis of stock ( N, Fig. 223). 



2) Heat 3" of opposite end of stock to 

 lemon glow. Forge to shape and dimen- 

 sions, as shown at M, Fig. 223. Care 

 must be taken to keep taper uniform on 

 both sides and to keep width of stock 

 unchanged. 



3) Reheat chisel end of stock to bright red and smooth with 

 hand hammer, and, if necessary, finally with flatter. 



4) Heat entire stock to dull red, plunge each end for entire 

 length of forged part in water for a few moments. Remove 

 stock from water and allow color to run to light blue at ex- 



FIG. 224. Cultiva- 

 tor shovel. 



