l to the lathe, a mandrel must first This appendage consists of a pin, A, formed with machinists for the purpose of constructing fine, del- be fitted to the spindie and turned on the outer end a spring back, B, so that when it is applied, as shown icate machinery when exactness was absolutely nec-… … or formed as to present a straight cutting edge to the Morse Twist Drill and Machine Qo. All siaes of drills caught and firmly held. This pln is applied at either metal, with a decrease in the angle of the groove as up to half-inch always on hand. The larger sizes side of the bow, where it presents…
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