. The 20th century toolsmith and steelworker; a complete, practical, and scientific book. thehammer is forged, and the teeth are to be cut in, neverheat above a bright cherry red, otherwise, if a veryhigh heat is used when cutting in the teeth, the teethwill not hold a good cutting edge, as there is no wayto refine the steel. Bush hammers differ somewhat, by having differentnumbers of teeth, which range from 16 teeth or 4 cuts TOOLSMITH AND STEELWORKER 137 to 144 teeth or 12 cuts. The one illustrated representsa 4-cut hammer. To put in the teeth first measure offinto squares according to the n
. The 20th century toolsmith and steelworker; a complete, practical, and scientific book. thehammer is forged, and the teeth are to be cut in, neverheat above a bright cherry red, otherwise, if a veryhigh heat is used when cutting in the teeth, the teethwill not hold a good cutting edge, as there is no wayto refine the steel. Bush hammers differ somewhat, by having differentnumbers of teeth, which range from 16 teeth or 4 cuts TOOLSMITH AND STEELWORKER 137 to 144 teeth or 12 cuts. The one illustrated representsa 4-cut hammer. To put in the teeth first measure offinto squares according to the number of teeth re-quired, and nick in with a sharp edged cold chisel;now heat the hammer to a cherry red and proceed tocut in the teeth by cutting in at the nicks with athick edge chisel, which will form the point of theteeth. Heat again; this time take a very thin edgedsplitting chisel and cut in to the depth required, whichwill vary according to the size of the teeth, but for a4-cut hammer, cut in to % of an inch deep. The firstend of the hammer may have the teeth cut in by letting. Fig. 76. Illustrating how bush hammer is forged beforecutting in the teeth. the opposite end rest on the anvil, but to cut the teethin the other end the hammer will have to be placedon a block of wood or some other convenience, whichwill not interfere with the teeth. After the teeth have been cut in they will have to befiled to a sharp square point by using a flat feather-edge file, thus, ^ . A file of this description will gomuch deeper into the cuts than an ordinary three-cornered file. When filing be careful to keep all the 138 THE TWENTIETH CENTURY teeth the same length. In large up-to-date tool shopsthe teeth are put in by the use of a planer, but in smallor ordinary shops the teeth must be put in by the useof a chisel and file. When hardening, heat to a very even heat justenough to harden, being careful that the corners donot become overheated by heating too fast, and alsowatch the extreme p
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