. Railway mechanical engineer . 1-2 IN. AIR COMPRESSORS Assistant Roundhous BY J. H. HAHNreman. Norfolk & Western. Bluefield, W. Va Some trouble is experienced with the Westinghouse Q^^S-in.:air compressors on account of the threads in the reversing■valve chamber stripping. This often makes it necessary toreplace these heads. It is an expensive practice to scrap theheads on account of this defect, especially under presentconditions, and the sketch shows a special chuck or Jigwhich was designed by H. B. Stratton, a machinist in theJBlueiield shops, for holding the heads while boring out thereve
. Railway mechanical engineer . 1-2 IN. AIR COMPRESSORS Assistant Roundhous BY J. H. HAHNreman. Norfolk & Western. Bluefield, W. Va Some trouble is experienced with the Westinghouse Q^^S-in.:air compressors on account of the threads in the reversing■valve chamber stripping. This often makes it necessary toreplace these heads. It is an expensive practice to scrap theheads on account of this defect, especially under presentconditions, and the sketch shows a special chuck or Jigwhich was designed by H. B. Stratton, a machinist in theJBlueiield shops, for holding the heads while boring out thereversing valve bush chamber for the bushing used in re--claiming the heads. The jig is forged out of wrought iron in one piece and•finished all over. After it has been threaded to fit the lathespindle, and faced off, it is advisable to finish it on thetspindle of the lathe on which it is to be used. Four drilled to receive jg-in. machined bolts which are used Mse fburBolfs hJxjs/en One Bolfihoi. Thnad h fifarty Lafhe Spindte Jig for Boring out the Reversing Valve Bushing on 91 Head -to bolt tlie head on the jig. Only one bolt is sliown in thesketch. By using this device it is not necessarj- to set up the jig is threaded to screw on to the lathe spindle and theheads bolted to the jig as shown in the sketch. As the re-versing valve chamber is in the center of the head, no is rtfjuired. This method shortens the operation ofboring and threading the chambers to receive the bushings are of the usual design marie of wroughtiron, threaded on the outside 10 threads per Inch and on theinside to receive the reversing valve chamiier cap. Thebushings may be made on a turret lathe in fjuantity and•carried in stock. It is imperative that all original dimen- be maintained in making repairs to the top heads, andjf necessary to apply a that extends below any of the ports, always re-drill the por
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
