. Railway mechanical engineer . tached to a removaljle face plate which can becentered by means of screws. The grinding wheel is mountedon an extended spindle, carried on the cross slide and drivenfrom an overhead counter shaft. By centering the bushing,setting the wheel to take a light cut, and moving it back andforth while the body is slowly revolved, the bushing can bemade true and smooth without removing any more metal thanis necessary. By changing face plates the machine can beadapted to any type of latlie. The uneven wear of bushingsis the frequent cause of irregular action in triple val
. Railway mechanical engineer . tached to a removaljle face plate which can becentered by means of screws. The grinding wheel is mountedon an extended spindle, carried on the cross slide and drivenfrom an overhead counter shaft. By centering the bushing,setting the wheel to take a light cut, and moving it back andforth while the body is slowly revolved, the bushing can bemade true and smooth without removing any more metal thanis necessary. By changing face plates the machine can beadapted to any type of latlie. The uneven wear of bushingsis the frequent cause of irregular action in triple valves anda machine for grinding them should form part of the equip-ment at least in the larger shops. Another useful device for repairing triple valves is a press for closing the grooves in the piston shown in Fig. 2. Thebase is made of cast iron with a hole through the center and acounter-bored recess at the top. The bottom die is placedin the recess and the piston is set on it with the stem extend- L j^^€?_ J k---?!^-*?™.-^. ng Triple Valve Piston Ring Grooves ing down into the base. The upper die is placed on thepiston and the top is set over it and turned to lock it to thelugs on the base. By turning down the screw in the top the Fig. 3—Five Spindle Angle Cock Grinding rvlachlne piston can be compressed and the grooves closed. It has beenfound that the operator soon becomes skilled in using this de-vice so he can get a good fit in a very short time. The dies February, 1919 RAILWAY MECHANICAL ENGINEER 97 shown in the illustration are the sizes used for L-2 and L-itriple valves. The angle cock grinding machine shown in Fig. 3 wasoriginated on the Northern Pacific. It is convenient tooperate and grinds the cocks very rapidly. The plugs arefastened to live vertical spindles which are revolved and re-versed by a segmental gear. At the same time a trip lifts the plug froin the body at regular intervals. The spindle can beraised by means of a handle and when at the top point i
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
