. American engineer . Apparatus for Drilling Tell-tale Holes in Staybolts. BY PAUL R. DUFFEY. The machine is clamped in any desired position on the slide It has been the general practice to drill tell-tale holes in stay- D by means of the support clamp B, support clamp block C bolts before applying the bolts and to countersink the ends suf- and screw A. The swivel plate A has a bracket F for the ficiently to prevent closing the holes when riveting. A number spindle feed, attached to it in such a way that it may be turned of shops applied bolts without drilling, but when the drilling to any pos
. American engineer . Apparatus for Drilling Tell-tale Holes in Staybolts. BY PAUL R. DUFFEY. The machine is clamped in any desired position on the slide It has been the general practice to drill tell-tale holes in stay- D by means of the support clamp B, support clamp block C bolts before applying the bolts and to countersink the ends suf- and screw A. The swivel plate A has a bracket F for the ficiently to prevent closing the holes when riveting. A number spindle feed, attached to it in such a way that it may be turned of shops applied bolts without drilling, but when the drilling to any position and the main spindle J, which holds the drill,. Sea-Hon P/afe, Brass. E \—/j—Hj K 2i-—-H Support damp Screw, Sfee/. ASupporf B Details of Machine for Drilling Tell-tale Hole Supporf C/arryp Block, 5fee/. C was done later the depth of the holes did not conform to thepresent standard, and in consequence had to be redrilled tostandard. In order to drill the bolts to the proper depth after they areapplied, the machine illustrated here was devised. It permitsof accurately drilling holes in staybolts at any angle after theyare in position in the firebox. The whole machine is supported passes through this bracket. The feed gear G, which has teethengaging with those on the main spindle /, is controlled bymeans of the handle in the feed gear support H and theratchet lock K. The power for operating the drill is suppliedby an air motor. This device is in use at the Portsmouth,Ohio, shops of the Norfolk & Western, where 1,800 holes havebeen drilled by it with six 3/16 in. drills. May, 1913. AMERICA
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
