. 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 . to be very hard. Most mechanics who have use fora scratchawl prefer the opposite end flattened andbent to shape as Fig. 109. Fig. 109. The scratchawl. Hardening and Tempering Circular Blades of PipeCutter. To harden circular blades of pipe cutter, heat thewhole blade to a ve
. 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 . to be very hard. Most mechanics who have use fora scratchawl prefer the opposite end flattened andbent to shape as Fig. 109. Fig. 109. The scratchawl. Hardening and Tempering Circular Blades of PipeCutter. To harden circular blades of pipe cutter, heat thewhole blade to a very even cherry red heat, thenquench the whole tool and cool off entirely. After- 180 THE TWENTIETH CENTURY wards draw the temper to a dark blue on a piece ofheated flat iron. Should there be a great many of thesetools to be hardened at once and there is no heating fur-nace in the shop, place a piece of flat iron on the sur-face of the fire, heat it to a deep red heat, then placethe blades on it, as the blades are of a flat shape it willnot take long for them to heat hot enough to 5 or 6 of the blades on the heated plate at onetime, but watch carefully and keep turning them overfor fear some of them should become a little overheatedor heated in streaks. After quenching draw the temperalso on a hot 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
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherc, booksubjectsteel
