. Railway mechanical engineer . ndent adjust- underneath. A ()unii), driven by a pulley on the back gearshaft, furnishes ample cutting lubrication. The new turretlathe is made in three sizes, Nos. 3, 4 and 6, having auto-matic chuck capacities of 1^-in., l:>^-in. and 2J^-in., re- 808 RAILWAY MECHANICAL ENGINEER Vol. 94, No. 12 spectively. The diameters of swing over the turret slide are6 in., 6^ in. and 8 in., respectively. The lengths that canbe turned are 8 in., 10 in. and 14 in. The respective diameters of swing over bed are 16y2 in., 18^ in. and21-;4 in. Pulleys on the countershafts are
. Railway mechanical engineer . ndent adjust- underneath. A ()unii), driven by a pulley on the back gearshaft, furnishes ample cutting lubrication. The new turretlathe is made in three sizes, Nos. 3, 4 and 6, having auto-matic chuck capacities of 1^-in., l:>^-in. and 2J^-in., re- 808 RAILWAY MECHANICAL ENGINEER Vol. 94, No. 12 spectively. The diameters of swing over the turret slide are6 in., 6^ in. and 8 in., respectively. The lengths that canbe turned are 8 in., 10 in. and 14 in. The respective diameters of swing over bed are 16y2 in., 18^ in. and21-;4 in. Pulleys on the countershafts are recommended torun at speeds of , 306 and 283 Li:ht ^^>io^ht Portable Pneumatic Grinder ALIGHT pneumatic grinder, using 6 or S-in. wheelsand weighing 14 lb., has been placed on the marketrecently by the Roto Pneumatic Company, Cleveland,Ohio. The grinder is simple in both design and construction,there being but three moving parts. The shaft assembly withpistons rigidly mounted constitutes a single rotating Roto Pneumatic Grinding Machine This, in cominnation with two self-sealing sliding valves,forms the only moving parts in the motor. By eliminatingcrank shafts and connecting rods, friction and maintenancecosts are greatly reduced. Another advantage is the reductionof motor vibration. In operation compressed air enters the machine through thecontrol handle and is applied to the pi.^tons in the directionin which the shaft rotates. The turn-handle air control ofthe motor is self-sealing, absolutely balanced and the throttlewill stay in any position in which it is placed by the control valve will throttle to zero without causing anyintermittent pulsation, and when the throttle is closed sud-denly, the motor valves automatically release, permitting theair to by-pass and allow the motor to idle down air port areas are large and the amount ofgrinding power can be obtained from the air. Under averageconditions about 15 to 20
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
