. The 20th century toolsmith and steelworker; a complete, practical, and scientific book. a indi-cates how far back from the cutting edge, as b, thesteel is to be heated when hardening. All roughingtools are made after the same shape. Bear in mindwhen forging air hardening steel, never try to forge itbelow a low cherry red and if at any time it is neces-sary to cut a bar into lengths, do not try to cut it cold,as it must be heated. 98 THE TWENTIETH CENTURY How to Anneal Air Hardening Steel. Sometimes, although seldom the toolsmith is calledupon to anneal air hardening steel, so that it may bet
. The 20th century toolsmith and steelworker; a complete, practical, and scientific book. a indi-cates how far back from the cutting edge, as b, thesteel is to be heated when hardening. All roughingtools are made after the same shape. Bear in mindwhen forging air hardening steel, never try to forge itbelow a low cherry red and if at any time it is neces-sary to cut a bar into lengths, do not try to cut it cold,as it must be heated. 98 THE TWENTIETH CENTURY How to Anneal Air Hardening Steel. Sometimes, although seldom the toolsmith is calledupon to anneal air hardening steel, so that it may beturned or planed. This class of steel is very difficult toanneal on account of its extreme hardness. It must notbe packed directly in slacked lime or ashes as cast toolsteel, as it will cool off too quickly. To anneal air hard-ening steel, use an air tight heavy iron box, place thesteel inside the box, then heat altogether to a deep redheat, then pack the box deep into slacked lime orashes. If an iron box cannot be obtained, use a heavyiron pipe or band large enough to accommodate the. Fig. 47. Heavy roughing tool. steel, without having the steel project out through theend. Also have two heavy flat iron plates large enoughto cover the end of the pipe. Place, the steel in thepipe and heat the pipe, likewise the plates, as formerlymentioned, then pack the pipe into the lime in an up-right position, having one of the plates directly underthe pipe, the other on top, which will keep the steelfrom coming in contact with the lime. By followingthis method the steel will keep hot a very long time, TOOLSMITH AND STEELWORKER 99 and thus give good results. To anneal a piece of 1-inchsquare air hardening steel will require from 12 to 15hours time. Milling Cutters. These tools are very valuable to the machiniststrade, and the making of them requires great skill, val-uable time and good steel, which makes them very ex-pensive tools. If they are not properly forged andhardened there is a great
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