. Electric railway journal . achinists on the six other steps are usedon other work after completing their particular partof the machine work on the lot. By putting the shaftsthrough in quantities of one type the time lost in set-ting up the machines for the different types is reducedto a very small item. A new kink has been worked out in connection withthe keyway for the pinion, which is designed to preservethe maximum strength of the shaft at the inner end ofthe taper where the maximum strain takes place. Thekeyway is machined only from a mid-point of thetapered surface to the end, leaving t
. Electric railway journal . achinists on the six other steps are usedon other work after completing their particular partof the machine work on the lot. By putting the shaftsthrough in quantities of one type the time lost in set-ting up the machines for the different types is reducedto a very small item. A new kink has been worked out in connection withthe keyway for the pinion, which is designed to preservethe maximum strength of the shaft at the inner end ofthe taper where the maximum strain takes place. Thekeyway is machined only from a mid-point of thetapered surface to the end, leaving the full section ofthe shaft at the inner side of the pinion. It was feltthat with a perfectly tapered and finished shaft andpinion, and with pinion properly pressed on, no keywhatever is really needed. However, H. H. Adams,superintendent of shops and equipment, and T. , master mechanic of the West Side shops,were not satisfied to depend altogether on friction,though they did conclude that a half-length key would. 1 1 M Mm -A t-^^ V :y V // J. „ -3-0/i or (diameter ARMATURE SHAFT FOR G. E. 226 MOTOR, SHOWING HALF-LENGTH KEYWAY FOR PINION give adequate insurance against loose pinions. A draw-ing of a shaft showing the dimensioning of the half-length keyway is reproduced herewith. I Open Circuits Traced to Core Slippage Considerable trouble with open circuits due to break-age of the commutator leads on a type of motor havinga very short core has been experienced in cause of this trouble was sought for a long time andvarious remedies were applied. The trouble continued,however, until occasion arose to renew several arma-ture shafts. Then it was found that a very slightslippage of the armature core laminations on the shaft,amounting to something less than A in. at the peripheryof the core, was taking place. Investigation developedthis fault to be frequent, the existence of slippagebeing indicated or determined by sounding, by wornkeys, by testing with a ba
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