American Blacksmithing, toolsmiths' and steelworkers' manual . Fig. 109. The scratchawl. Hardening and Tempering Circular Blades of Pipe Cutter. 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 b
American Blacksmithing, toolsmiths' and steelworkers' manual . Fig. 109. The scratchawl. Hardening and Tempering Circular Blades of Pipe Cutter. 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 A V 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: ., bo, bookauthorholmstrmjohngustaf, bookcentury1900, bookdecade1910
