American Blacksmithing, toolsmiths' and steelworkers' manual . Fig. 48. Plain or ordinary milling cutters. cutter up from the pipe. An iron bar placed throughthe center of the cutter with a bearing under each endwill keep the cutter from coming in contact with thepipe. TOOLSMITH AND STEELWORKER 103 The Use of Asbestos and Clay, When Hardening Mill-ing Cutters and Other Tools. Very often a milling cutter is made with a threadthrough the center of the tool which must be kept soft,while the outside or teeth are hardened, and the waythis process is accomplished is by the use of asbestos,which is p
American Blacksmithing, toolsmiths' and steelworkers' manual . Fig. 48. Plain or ordinary milling cutters. cutter up from the pipe. An iron bar placed throughthe center of the cutter with a bearing under each endwill keep the cutter from coming in contact with thepipe. TOOLSMITH AND STEELWORKER 103 The Use of Asbestos and Clay, When Hardening Mill-ing Cutters and Other Tools. Very often a milling cutter is made with a threadthrough the center of the tool which must be kept soft,while the outside or teeth are hardened, and the waythis process is accomplished is by the use of asbestos,which is packed well into the inside or thread, butmake sure that the outside ends of the thread are wellpadded over without allowing the asbestos to come incontact with the cutting edges of the teeth of the mill-ing cutter. The asbestos is kept in place while harden-ing by the use of fine pliable wire, wrapped around thetool. After the hardening has been done and the asbes-tos taken out from the inside the thread will be quitesoft. The reason the thread has remained
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