Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . fig. 75-—usefui,:eardening device. hobs, etc., is shown in Fig. 75, and consistsof a piece of drill rod, R, threaded about aninch longer than the length of the article tobe hardened, and nut and washer located asshown. The dotted lines show the work tobe hardened, AAAA, asbestos washers, BB,common iron washers, the whole being heldtogether between the two nuts. Heat theentire arrangement to the proper tempera-ture and quench in water in the usual man-ner. By
Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . fig. 75-—usefui,:eardening device. hobs, etc., is shown in Fig. 75, and consistsof a piece of drill rod, R, threaded about aninch longer than the length of the article tobe hardened, and nut and washer located asshown. The dotted lines show the work tobe hardened, AAAA, asbestos washers, BB,common iron washers, the whole being heldtogether between the two nuts. Heat theentire arrangement to the proper tempera-ture and quench in water in the usual man-ner. By using a device of this sort an up-ward flow of water through the article isprevented, as is the consequent sudden chill,thus eliminating to a certain extent the tend-ency to warp or crack. In such tools inwhich the outside only is desired to be hard-ened, the method is an excellent one, as theinside will remain comparatively soft, unlessvery thin, when it will harden clear Hardening and Tempering Collet Spring following kink we have found very handy when makingcollet spring chucks of the shape shown in Fig. 76. After finish-ing them in the lathe, leaving, of?course, enough stock to lap andgrind to a finish, face them on anarbor and saw the spring slots asshown; that is, at the end of eachslot, as shown at T and V. In-stead of cutting completely throughat this point, leave a very thin wallabout ys inch long at the end of the cuts. Then harden and temper the chucks as desired, andafter lapping the inside to size, place on an arbor and grind thetapers as required; then take a small, narrow broach and by•entering it into the slots and hitting it a sharp blow with a ham-mer the thin wall will break through. This kink I have usedto the best advantage in shops which had no grinding proceeding as aforesaid it was possible to finish the outsideand taper to size before hardening without the possibility of thechucks running out to an
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Keywords: ., bookcentury1900, bookdecade1900, bookidhardeningtem, bookyear1903
