. American engineer and railroad journal . FIG. 1 MUFFLE FUKNACE FOB HARDENING MILLING CUTTERS, OF AW. HIGH SPEED STEEL. ETC., CIBCULAB FURNACE FOR HARDENING LARGE CUTTERS. when the labor that has been put upon it, added to the costof the steel, is rendered useless by the cutter cracking inhardening. It is usually necessary after a milling cutter is Januaby, 1906. AMERICAN ENGINEER AND RAILROAD JOURNAL. 29. X HIGH SPEED SLAB MILLING MACHINE WITH 40 MOTOB; A W. CUTTERS CUTTING STEEL AT 180 FT. PEB MINUTE; % IN. DEPTH OF CUT, iy2 IN. WIDTH; FEED, 6 IN. PEB MIN. completely worn down, for it
. American engineer and railroad journal . FIG. 1 MUFFLE FUKNACE FOB HARDENING MILLING CUTTERS, OF AW. HIGH SPEED STEEL. ETC., CIBCULAB FURNACE FOR HARDENING LARGE CUTTERS. when the labor that has been put upon it, added to the costof the steel, is rendered useless by the cutter cracking inhardening. It is usually necessary after a milling cutter is Januaby, 1906. AMERICAN ENGINEER AND RAILROAD JOURNAL. 29. X HIGH SPEED SLAB MILLING MACHINE WITH 40 MOTOB; A W. CUTTERS CUTTING STEEL AT 180 FT. PEB MINUTE; % IN. DEPTH OF CUT, iy2 IN. WIDTH; FEED, 6 IN. PEB MIN. completely worn down, for it to be annealed, so that it maybe re-cut. It is very largely because of this that steel of thegreatest purity should be used, otherwise marked deteriora-tion will be observed each time the cutter is re-hardened—even should cracking be avoided. Some recent tests of thischaracter showed less than 5 per cent, loss of efficiency inthe A W. steel after seven times annealing and hardeningof the same piece of metal. Steel for use in milling and gear cutters should be reason-ably tough, with a capacity for retaining a sharp cuttingedge, and combined with great powers of endurance, for ifthe edges become quickly dulled greater power will be re-quired, while the resulting finish of the work will not be of &satisfactory character, and since the grinding and setting upof a milling cutter is comparatively a
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
