Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . 238 HARDENING^ TEMPERING AND ANNEALING. Directions: Set the plane of the centers below the spindleplane the distance required for clearance. Set both swivels andtable at zero. Large saws, up to 24 inches in diameter, such as are used incold saw cutting-off machines, are ground as shown in Fig. will be noticed that the universal head is here reversed on thetable and the tooth rest placed on the emery wheel head. Gear Cutter 161 and 162 re
Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . 238 HARDENING^ TEMPERING AND ANNEALING. Directions: Set the plane of the centers below the spindleplane the distance required for clearance. Set both swivels andtable at zero. Large saws, up to 24 inches in diameter, such as are used incold saw cutting-off machines, are ground as shown in Fig. will be noticed that the universal head is here reversed on thetable and the tooth rest placed on the emery wheel head. Gear Cutter 161 and 162 represent an elevation and plan of the gear-cutter grinding attachment. The platen which holds cutter isfitted to the slot in the table and clamped to it by bolt and (0 s s|FIG. 161.—ELEVATION OF GEAR CUTTER GRINDING ATTACHMENT. The table should be set right angular to the slide and the slideat a right angle to the axis of the emery wheel spindle (see dottedlines), as this position brings only the edge of the emery wheel incontact with the work, permitting a heavy cut to be taken withoutdanger of heating. In adjusting the cutter for grinding, the centering gage be-longing to the attachment is set over against the face of the the pawl holder is clamped so as to bring the pawl tooth restagainst the heel of the tooth. After swinging the centering gageout of the way, as shown in cut, the grinding may proceed. Thus,with this arrangement, gear and formed cutters can be groundcorrectly and in less time than by hand. Bushings for the varioussizes of holes in standard gear cutters and emery wheel No. 3are required with this attachment. GRINDING. 239
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