. American engineer and railroad journal . uence has ever been brought to bear upon thedevelopment of sliapers than that resulting from the intro-duction of the new high d\ity steels for cutting tools, togetherwith the modern variable-speed systems of driving wherebythe operators are enabled to very quickly change cuttingspeeds and so secure the fullest possibilities from the great by starting boxes conveniently located on the rear of the ma-chine frames. It is usually feared, in drives of this type, thattrouble might be given by the short belts occasioned by thecloseness of the pulley centers
. American engineer and railroad journal . uence has ever been brought to bear upon thedevelopment of sliapers than that resulting from the intro-duction of the new high d\ity steels for cutting tools, togetherwith the modern variable-speed systems of driving wherebythe operators are enabled to very quickly change cuttingspeeds and so secure the fullest possibilities from the great by starting boxes conveniently located on the rear of the ma-chine frames. It is usually feared, in drives of this type, thattrouble might be given by the short belts occasioned by thecloseness of the pulley centers, but the experience of the Pot-ter & Johnston Company has proven this to be not so. Thebells are run fairly tight and give no trouble. The upiier engraving on page 270 illustrates an application ofmotor driving to the lil-in. bac-k-geared shaper built by theAmerican Tool Works Company. Cincinnati, Ohio. The motoris mounted on a substantial base directly back of the columnto which it is bolted. The bolt holes in the base are prolonged. BELTED DKIVES U1>0N 15-lN. AiND 24-lN. UNIVERSAL CRANK-SUAfEHS—UUILT UY THE IOTTEB & JOHNSTON MACHINE COiirANY. MOTORS.—GENERAL ELECTRIC COMlANT. endurance of the tool steels. The importance of motor drivingin this connection is rapidly gaining ground with users ofmachine tools, and in many establishments important reduc-tions In the per-pound labor costs have been made. Severalinstances of such motor-drive applications to shapers by themore progressive tool builders are presented below. Notable among recent applications of motor driving toshapers are the two machines illustrated in the engraving pre-sented above, which illustrate two universal shapers, built bythe Potter & Johnston Machine Company, Pawtucket, R. I.,thus equipped. The methods of mounting the motors in theseinstances are ideally simple, the motors being carried by mereextensions of the shapers bases, to which they are rigidlybolted. The drive is by belt and
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
