Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . FIG. 102.—FND MILL. FIG. 103.—FACING MILL. ters for milling tool steel if followed out will be the means of se-curing satisfactory results. HARDENING MILLING CUTTERS. 153 Heat the cutters in a gas furnace, open fire or in a hot leadbath. Not so much depends on the means used for heating asupon how hot and whether uniformly heated;and as to lead stick-ing to the work, if it is used, there should be little trouble if purelead is used with plenty of broken charc
Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . FIG. 102.—FND MILL. FIG. 103.—FACING MILL. ters for milling tool steel if followed out will be the means of se-curing satisfactory results. HARDENING MILLING CUTTERS. 153 Heat the cutters in a gas furnace, open fire or in a hot leadbath. Not so much depends on the means used for heating asupon how hot and whether uniformly heated;and as to lead stick-ing to the work, if it is used, there should be little trouble if purelead is used with plenty of broken charcoal on top to preventoxidation; but if there is still trouble it can be avoided by coatingthe article with salt before putting into the lead-heating is easily done by warming the work up to a blue and dippingin a strong solution of salt and water. In hardening, the cutters may be cooled in cold water or brine,temperature depending on the character of cutter, whether very
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