Handy man's workshop and laboratory . chucked in a lathe, and the bearing blocksC bored and faced to fit the end of the crankpin. The hole inthe ring A should then be bored to fit that part of the enlargedpin nearest the crank. This being done, the square rail F, toolcarriage, and feed screw can be put in place. On attaching themachine to the crankpin, the three bearing blocks are removed,the machine slid over the crankpin until the ring A fits over andagainst the enlarged end E of the pin and against the face ofthe crank. The bearing blocks C are then fastened in place, readyto do the work. A
Handy man's workshop and laboratory . chucked in a lathe, and the bearing blocksC bored and faced to fit the end of the crankpin. The hole inthe ring A should then be bored to fit that part of the enlargedpin nearest the crank. This being done, the square rail F, toolcarriage, and feed screw can be put in place. On attaching themachine to the crankpin, the three bearing blocks are removed,the machine slid over the crankpin until the ring A fits over andagainst the enlarged end E of the pin and against the face ofthe crank. The bearing blocks C are then fastened in place, readyto do the work. A ring / is counterbored to fit ring A, asshown, and is then clamped against the arm of the crank withtwo bolts, one on each side. The necessary clearance is allowedin ring I, so as to allow ring A to revolve when ring / isclamped securely agains the arm of the crankpin.—17 BORING CYLINDER BUSHINGS FOR LOCOMOTIVES We had some cast-iron cylinder bushings to bore and turn forlocomotives. As there were about twenty-five bushings in the. Fig. 152—Boring a locomotive cylinder bushing lot to be machined, and we were in a big hurry to get thejob out, we rigged up a special tool for the job. Fig. 152 showsthe tool, and the way in which it was attached to a lathe. Theboring head A, which is keyed to the bar B, had six dovetailed HANDY MAN S WORKSHOP AND LABORATORY 171 jnfi slots cut across its periphery. These slots were used for holdinghard-wood blocks,-^, which fitted closely into the bore and guidedthe bar. A boring tool was clamped in the groove across thehead, as shown, at C. The split sleeve D, which was fastened tothe lathe carriage, supported one end of the boring bar, and thesleeve was clamped to the bar when boring, as the feeding wasdone by the lathe carriage. The bar was also supported by asteady-rest, as shown at E. Before the boring bar was placed inposition, the end of thecylinder was trued up,as the outer end of thecylinder had to be sup-ported by a steady-restF. In s
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