. Railway mechanical engineer . vents strippingand shaving the threads and makes the usual close cammingof the machine unnecessary. A lever trip is provided which reduces the force of trip-ping the die head and therefore lightens the reaction on thethreads being cut. Buffer springs allow the head to yieldslightly when the chasers come in contact with the work,insuring a smooth thread. Two check nuts on the side ofthe head provide easy adjustment of the point of spring closing attachment eliminates as far as possibleshock and wear, being located in a convenient position tostrike a st
. Railway mechanical engineer . vents strippingand shaving the threads and makes the usual close cammingof the machine unnecessary. A lever trip is provided which reduces the force of trip-ping the die head and therefore lightens the reaction on thethreads being cut. Buffer springs allow the head to yieldslightly when the chasers come in contact with the work,insuring a smooth thread. Two check nuts on the side ofthe head provide easy adjustment of the point of spring closing attachment eliminates as far as possibleshock and wear, being located in a convenient position tostrike a stop on the machine which automatically closes thedie head when the turret revolves. The chasers are of sturdy construction, having long bear-ings in the die head skeleton and are supported by hardenedkeys which prevent tilting and consequent cutting of taperthreads. Four chasers are provided in each die head and the shanks are arranged to fit the particular size of machineon which they are used. These die heads are made in three. Geometric Self-Opening Die Head, Style D. S. sizes and have a capacity to cut threads from 1/16 in. toJ4 in. in diameter with pitches varying from 18 or finer to 10. Franklin Precision Power Reverse Gear UNUSUAL and interesting tests of the new FranklinPrecision power reverse gear manufactured by theFranklin Railway Supply Company, Inc., New York,were made recently at Franklin, Pa. The object was to putthe gear through tests that would duplicate locomotive serviceas nearly as possible and to subject it to conditions moresevere than would occur on the locomotive itself. The specificpurposes of the tests was to determine whether the pistonwould absorb valve motion shocks without moving, whetherthe gear would remain where set without creeping, whetherthe cut-off could be readily adjusted under load, whether the Compressed air at a pressure of 105 lb. per square inch wasapplied to the cylinder. A set of gages was attached to thecylinder compartment for pres
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
