. American engineer . coasting off the ways. By virtue of the commutating pole design of the motor, starting,stopping and reversing are accomplished with sparkless com-mutation. In order not to brake dynamically from high speedin one violent step, means have been taken to accomplish thisin three distinct steps, braking down slowly from high speedsand then quickening the brake action at lower speeds. Thisfeature, in addition to quickening the brake, v\ill be recognizedas a decided advantage in the maintenance of the machine. Anoteworthy point in connection \\ith tlie operation of this drive ist
. American engineer . coasting off the ways. By virtue of the commutating pole design of the motor, starting,stopping and reversing are accomplished with sparkless com-mutation. In order not to brake dynamically from high speedin one violent step, means have been taken to accomplish thisin three distinct steps, braking down slowly from high speedsand then quickening the brake action at lower speeds. Thisfeature, in addition to quickening the brake, v\ill be recognizedas a decided advantage in the maintenance of the machine. Anoteworthy point in connection \\ith tlie operation of this drive isthat the planer table reverses extrenielx close to a line at theend of the cut. The cutting and return speeds are entirely independent ofeach other, so that it is possible to use the slowest cutting speedand tlie highest return speed, or vice versa, in any combinationnot exceeding four to one, with 35 to 70 cutting speeds andthe number of return speeds. Tlie saving obtainable by applyiiiy pfiwer direct to machine. Arrangement of Contactor Panel for Reversing Motor Drive. tools is considered as the amount of friction load that has thusbeen eliminated. This often reaches as much as 50 per cent., Type. Size. Drive. Planer ^f^ in. X 10 ft. Belt Planer .16 in. X 10 ft. Reversi Planer .Ifi in. X 10 ft. Belt Planer 35 in. X 10 ft. Reversii Planer 72 in. X 22 ft. Belt Planer 72 in. X 22 ft. Reversii 120 Stroke. l-t. perMin. Ft. perMin. Ft. perMin. ■/2 X A/2 X A 8 ft. 6 ft. 6 ft. 6 ft. 6 in. 16 28 18 54 X A)1 X Al 10 ft. 1 in. H X A 11 X Af 10 ft. 1 in. Cut. Total Cycle. Sec. on the drum, all of liberal proportions. Its sole function is toclose the shunt coil circuits of the forward and return line con-tactors. The motor field is entirely external to the master switch. yet it is in reality only a small part of
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
