. Railway mechanical engineer . ngton, Ind. The jig illustrated herewith has proved an effective devicefor reaming worn reversing valve bushings in the steam headsof New York air compressors. The bushings can be reamedwithout removing the compressor from the engine or takingoff the steam head and on account of this feature, the devicehas proved of great value in saving time at roundhouses andreducing the number of air compressor failures. A pair ofreversing valve bushings can be reamed and new packingrings fitted and applied in an hours time by one machinist. As shown in the illustration, the
. Railway mechanical engineer . ngton, Ind. The jig illustrated herewith has proved an effective devicefor reaming worn reversing valve bushings in the steam headsof New York air compressors. The bushings can be reamedwithout removing the compressor from the engine or takingoff the steam head and on account of this feature, the devicehas proved of great value in saving time at roundhouses andreducing the number of air compressor failures. A pair ofreversing valve bushings can be reamed and new packingrings fitted and applied in an hours time by one machinist. As shown in the illustration, the jig consists of a body Aarranged to be fastened to the under side of the steam head inplace of the reversing valve cap by means of five ^ in. capscrews. The reamer B is made in one solid piece with oneend threaded to advance the reamer, the extreme end beingsquared for a wrench. The other end consists of a pilotingstem % m- iQ diameter. In operation, the jig is attached tothe under side of the steam head, being held securely in. Device for Reaming Reversing Valve Bushings place by the cap screws. The reamer is guided by the pilot-ing stem C which is a running fit in bushing D. As thereamer is turned, it advances into the bushing and when fedin the full distance, leaves a smooth, true hole to which thereversing valve packing rings may be fitted. On account of the reaming action being upward, the chipsfall out of the valve chamber into the body of the jig andmay be brushed away through the apertures shown. Thisprevents any possibility of chips getting into the valves ofcylinders of the air compressor. Liberty Flue Cutter A device known as the Liberty flue cutter has given ex-ceptionally satisfactory service in the Horton shops of theChicago, Rock Island & Pacific for cutting out flues in frontends. Referring to the illustration, mandrel A is made oftool steel, slightly less than 1-H; in. in diameter and providedwith a l*/2 in. square end for driving. Plate B, made ofy2 in. stock,
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
