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Page:Popular Science Monthly Volume 90.djvu/309

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Popular Science Monthly

��293

��thread on the spindle and to drill and thread a corresponding hole in the face plate.

Another method of making a face-plate is to thread the spindle to receive a large nut, to which a metal disk about ^ in. thick and 4 in. in diameter has been fast- ened with small machine-screws. It is well to have the surface of the face-plate turned true in a machine-lathe. Holes for I by 3/16-in. stove or ma- chine bolts are drilled and threaded in the face-plate. A babbit metal collar for the outer end of the spindle may be cast by building up a paper mold around the spin- dle as indicated in the draw- ing. The spindle should first be wrapped with a single thickness of paper as for casting the bearings.

Another way to make a collar is to thread the end of the spindle to receive a large nut. The rounded face of the nut should be placed next to the standard and the thread cut the proper dis- tance down the spindle so that the nut shall bind upon the end of the thread, before it binds upon the standard. Metal plates 3 in. long, 2 in. wide and }/^ in. thick are screwed to the outer faces of the standards to recei\'e the end-thrust of the spindle. The pulley is about 3^ in. in diameter and is secured to the spindle by a pin. The faces of the pulley and drive-wheel should be turned slightly convex. The support for the tool-rest is made of two wood pieces each 14 in. long, 2 in. wide and i in. thick, fastened together by means of cross strips, leaving a >^ in. slot between the pieces to receive the center bolt. Hand wheels 2 in. thick and 3 in. in diameter are used for tightening the nuts on the bolts of the tool- rest and tail-stock. The wheels may be turned from wood.

The tail-stock is built up of three blocks cut from I -in. board. A slot to receive the square head-locking bolt is cut in the center block. The center block may be bored to receive the tail-spindle or it may be made of two sections as shown. The tail-spindle is a ^-in. square head-bolt about 10 in.

��long. The hand wheel for the tail-spindle

is made of two ^ by 3-in. wood wheels nailed together. One of these is bored to receive the bolt, and square recesses are cut into the inner faces of the wheels to receive the head of the bolt. Screwed to the tail-stock are two iron pieces, each 3 in. long, I in. wide and ^ in. thick. One of these is drilled and threaded to receive the threaded end of the bolt, and the other

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piece is drilled the full diameter of the bolt. A hand-wheel, bolt and nut are used for locking the tail-spindle. The head of this bolt is recessed into the hand-wheel in the manner described for the spindle-bolt. It may be necessary to cut the thread of the tail-bolt somewhat longer than the thread found upon it. The end of the bolt is filed to a conical ix)int.

A spur center is made by screwing a 3 or 4-in. wood wheel to the face-plate, passing the screws through the wood into the holes in the face-plate. The heads of the screws must be countersunk into the wood. Reverse the position of the tool- rest, turn the lathe and mark the exact center of the wheel. Drive a nail for a center spur, file it and break off surplus

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