Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . ?^la. 148.—SAMPLES OP GROUND WORK DONB IN TJNnrERSAL CUTTERAND TOOL GRINDER, FIG. 146. 230 HARDENING^ TEMPERING AND ANNEALING. The side teeth of angular and side milling cutters are groundoff with practically a straight line clearance. This is done with acup-shape emery wheel 3 inches in diameter on the left side ofthe machine. The advantages of grinding side teeth with a fairsize emery wheel, and at the same time grinding a straight lineclearance with an acc
Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . ?^la. 148.—SAMPLES OP GROUND WORK DONB IN TJNnrERSAL CUTTERAND TOOL GRINDER, FIG. 146. 230 HARDENING^ TEMPERING AND ANNEALING. The side teeth of angular and side milling cutters are groundoff with practically a straight line clearance. This is done with acup-shape emery wheel 3 inches in diameter on the left side ofthe machine. The advantages of grinding side teeth with a fairsize emery wheel, and at the same time grinding a straight lineclearance with an accompanying strong cutting edge, are knownto those who have heretofore been compelled to use a small wheelgrinding a hollow clearance and weak-cutting edge. (See ) To prevent the drawing of the temper from cutting edges ofside mills and the side teeth of angular cutters, etc., which have a. mG. 149.—GRINDING SIDE TEETH. broad surface, it is important that the heel of the tooth be stockedout first at a sharp angle, and only a small portion left to beground at a different angle. The change from stocking out tothe grinding of the cutting edge is quickly made by moving theknee a few degrees around the column. This feature of revolving the knee around the column has alsothe following advantages: Work can be brought in contact with the emery wheels oneither side of the wheel without rechucking. Also the article tobe ground can be brought in contact with the emery wheel in themost favorable position to either wheel for rapid grinding. Foran example, a side milling cutter may have the outer teeth groundofif on the straight face emery wheel on the right side of the ma- GRINDING. 231 chine, and the side teeth on the cup-shape wheel at the left sideof the machine, without taking the cutter off the arbor or disturb-ing the tooth guide. Cutters of small diameters and sharp angles c
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