. American engineer . arc shown in the following table: Prepare tlie machine, centers and chuck the rod 15 niin. Prill center 5 min. Face the end 4 min. Countersink center 4 min. Reset rod and mark for length 6 min. Drill center 8 min. Change tool and face end to length 8 min. Countersink center 4 mm. Remove rod and clear machine 5 min. The time required for turning the md. including making thefit at the crosshead end will be 184 minutes, of which roughand finish turning of the body requires 121 minutes and thefinishing and filing of the crosshead fit consumes 63 the pist
. American engineer . arc shown in the following table: Prepare tlie machine, centers and chuck the rod 15 niin. Prill center 5 min. Face the end 4 min. Countersink center 4 min. Reset rod and mark for length 6 min. Drill center 8 min. Change tool and face end to length 8 min. Countersink center 4 mm. Remove rod and clear machine 5 min. The time required for turning the md. including making thefit at the crosshead end will be 184 minutes, of which roughand finish turning of the body requires 121 minutes and thefinishing and filing of the crosshead fit consumes 63 the piston head fit is a similar operation and will re-cn ire the same time of 63 minutes. Threading the rod andfitting the nut will take 30 minutes more. After the crossheadfit is completed and before the rod is finally taken out of thecrosshead, the key slot is scribed. It is then transferred to adrill where a jig. shown in one of the illustrations, is used togi\e the correct angle to the slot. Four 5^ in. holes are drilled. ^Taper Key nay ^ in ISCrosshead and Pisfon Taper Fif J /n IZ 87hread5 perl Piston Rod to Which the Operations Specified Apply. through the rod. This requires 52 minutes, including thepreparation of the machine, setting of the chuck, installationand removing of the jig, etc. From the drill the rod passes tothe milling machine where it is clamped in \ blocks and an endmill breaks in the four 5^ in. holes. .A spiral mill then finishesthe slots to width. This operation requires 91 minutes, thedetailed operation being as follows: Prepare machine and set V blocks 15 min. Set mill and rough out slot 32 min. Change tool and finish mill slct 34 min. Remove rod and clear machine 10 min. If a new key is required a tin template is made from whichthe blacksmith forges a key and punches a cotter pin the key will take 60 minutes, and fiHng and fitting it inthe rod and crosshead will require 60 minutes more. The total time for finishing the rod complete is 479 minut
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
