. The 20th century toolsmith and steel worker; a complete, practical, and scientific book, written by a thorough expert mechanic and steelworker, especially in the interests of blacksmiths, toolsmiths, toolmakers, and all mechanics connected directly on indirectly with the use, repair, and manufacture of steel into tools . The correct method. rectly in the center, which will weld the center firstand force all slag and foreign matter out. Otherwiseif the ends are welded first the slag will be forced intothe center and cannot get out, which would keep theparts from uniting or wielding. After wel
. The 20th century toolsmith and steel worker; a complete, practical, and scientific book, written by a thorough expert mechanic and steelworker, especially in the interests of blacksmiths, toolsmiths, toolmakers, and all mechanics connected directly on indirectly with the use, repair, and manufacture of steel into tools . The correct method. rectly in the center, which will weld the center firstand force all slag and foreign matter out. Otherwiseif the ends are welded first the slag will be forced intothe center and cannot get out, which would keep theparts from uniting or wielding. After welding to finish the chisel follow the direc- The wrong method. Fig. 58. Illustrating methods of scarfing steel forseparate welding. tions as mentioned in making a cold chisel, after hard-ening draw the temper to a dark blue. These direc-tions will apply to all wood chisels, plane bits, making or repairing any tool with a beveled 118 THE TWENTIETH CENTURY cutting edge, such as a framing chisel, Figure 59, forgethe bevel to shape as indicated by a, which will save agreat amount of filing or grinding, and the tool will bejust as good if it is hammered when at a low heat onthe flat and beveled surfaces only. Harden and temperall ordinary woodworkers chisels, at least 1% inchesback from the cutting Fig. 59. The framing chisel. The Screw Driver. A good screw driver is a tool which is prized by al-most every mechanic who uses one, but more, especiallyby woodworkers, and there are very few blacksmithsor tool dressers capable of making one to give perfectsatisfaction, as the screw driver will generally breakor twist when coming in contact with hard screw driv-ing. When making one select good steel of 75 points car-bon. After it is forged to the correct shape for an or-dinary screw driver as Figure 60, strike it a few good Fig. 60. Correct shape of ordinary screw driverwithout handle. blows on each flat side of the screw driving edge whileat a low heat. Then harden and all
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