. The Street railway journal . ith which the inter-polemotor can be made to vary its speed, itfwas adopted in place ofthe constant-speed motor generally employed. The drivingmechanism consists of a Renold silent chain, which transmitspower from a 3-hp, 525-volt, type S, inter-pole, variable-speed motor, made by the Electro-Dynamic Company, of Bay-onne, N. J. The motor is geared for 575 r. p. m., the ratiobeing 3 to 1, or 575 r. p. m. to 1725 r. p. m. A Bickford drillis used. The drill arm is attached to a column 11 ins. in diameter, andis made in pipe section to overcome the combined stresses
. The Street railway journal . ith which the inter-polemotor can be made to vary its speed, itfwas adopted in place ofthe constant-speed motor generally employed. The drivingmechanism consists of a Renold silent chain, which transmitspower from a 3-hp, 525-volt, type S, inter-pole, variable-speed motor, made by the Electro-Dynamic Company, of Bay-onne, N. J. The motor is geared for 575 r. p. m., the ratiobeing 3 to 1, or 575 r. p. m. to 1725 r. p. m. A Bickford drillis used. The drill arm is attached to a column 11 ins. in diameter, andis made in pipe section to overcome the combined stresses oftwisting and bending. It is raised and lowered by power underthe control of a lever within the operators reach. The backgears are fitted with friction clutches, which give four changesof speeds for each position of the driving belt or set of drivinggears. The spindle has sixteen changes of speed, arranged ingeometrical progression, and is provided with both hand andpower feed, quick advance and return, safety stop, automatic. INTER-POLE MOTOR DRIVING RADIAL DRILL IN SHOPS OFTHE PHILADELPHIA RAPID TRANSIT COMPANY trip, dial depth gage and hand lever reverse. An engravedplate attached to the arm shows the operator how to obtain theproper speeds for different metals and diameters of drills. Thedepth gage answers a double purpose—besides enabling theoperator to read all depths from zero, which does away withthe usual delays connected with scaling or calipering, it sup-plies a convenient means for setting the automatic trip, as thegraduations show exactly where each dog should be located inorder to disengage the feed at the desired points. The feedingmechanism furnishes eight rates of feed, ranging in geometricalprogression from .007 in. to .064 in. per revolution of spindle,each of which is instantly available. The tapping mechanismis located on the head, and permits the backing out of taps atany speed with which the machine is provided, regardless ofthe speed used in driving t
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
