Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . FIG. 68.—TWIST DRILL. a piece which has been hardened at a very low heat and not tem-pered at all, although the piece which was heated too hot andhardened and drawn will be softer than the other piece. When hardening long, flat or round objects they should be. FIG. 69.—TWIST DRILL. dipped endwise, holding them perpendicular with the surface ofthe bath. When this is done the articles will come out perfectlystraight, or at least very little sprung. When dipped
Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . FIG. 68.—TWIST DRILL. a piece which has been hardened at a very low heat and not tem-pered at all, although the piece which was heated too hot andhardened and drawn will be softer than the other piece. When hardening long, flat or round objects they should be. FIG. 69.—TWIST DRILL. dipped endwise, holding them perpendicular with the surface ofthe bath. When this is done the articles will come out perfectlystraight, or at least very little sprung. When dipped otherwisesuch tools will warp. When dipping a half-round tool dip it with
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Keywords: ., bookcentury1900, bookdecade1900, bookidhardeningtem, bookyear1903
