. Electric railway journal . Brooklyn Rapid Transit System The machine which is described in this article wasdeveloped for the purpose of accomplishing the sameresults as are produced with the several makes of flex-ible shaft grinder but with a form of drive which wouldbe less expensive for maintenance. A rather cumber-some machine was first put together and, after trialresults had indicated that the principles were applicableto this work, the refinement of the machine was carriedout with the co-operation of the mechanical departmentof the company. The resulting machine is shown in the illustr
. Electric railway journal . Brooklyn Rapid Transit System The machine which is described in this article wasdeveloped for the purpose of accomplishing the sameresults as are produced with the several makes of flex-ible shaft grinder but with a form of drive which wouldbe less expensive for maintenance. A rather cumber-some machine was first put together and, after trialresults had indicated that the principles were applicableto this work, the refinement of the machine was carriedout with the co-operation of the mechanical departmentof the company. The resulting machine is shown in the illustrationspresented herewith. For want of a better name it hasbeen called a swing-frame grinder. The drive is bybelts from an electric motor to two countershafts, eachmounted in yoke-shaped castings. The upper castingis mounted upon channel-iron posts, and this casting sup-ports a vertical arm which in turn supports a yokecarrying a horizontal arm, at the outer end of which isanother yoke to which the grinding wheel is SWING-FRAME GRINDER DEVELOPED BY BROOKLYN RAPID TRANSIT COMPANY FOR SPECIAL JOBS IN TRAvJK WORK 966 ELECTRIC RAILWAY JOURNAL [Vol. XLIX, No. 21 Each arm is arranged to swivel, thus providing for hori-zontal lateral movement and angular movement as re-quired in grinding grooves. The combination is suchas to provide a universal movement for any desired posi-tion of wheel and any direction of movement. It will benoted that the pulleys are kept in fixed positions which,in turn, secures constant tension on the belts at alltimes. The horizontal arm which carries the grinding wheelis supported from a short outrigger arm by a spring ofsufficient strength in tension to hold the grinding wheelabove the ground except when force is exerted by theoperator when he is ready to grind. This spring alsotakes up initial shocks in the wheel when first attack is Change in Lubricating Methods Effectsa Big Economy Cost of Lubricants per iooo Car-Miles Reduced from84 Cents to 22
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