. American engineer and railroad journal . iving worm is taken by bearings cast solid with the ordinary requirements the drive is through spur gears fromthe four-step cone, and where desired for motor or belt con-nection, back gears are placed on the drive, giving a spindle ro-tation with a range of lo to I. This permits of drilling studpin holes and finishing both externally and internally the pro-jections for oil cups, a very valuable feature in repair shopsnot having enough of the boring to keep the machine busy onthe same operations. Motion for the feed is taken through spiral g
. American engineer and railroad journal . iving worm is taken by bearings cast solid with the ordinary requirements the drive is through spur gears fromthe four-step cone, and where desired for motor or belt con-nection, back gears are placed on the drive, giving a spindle ro-tation with a range of lo to I. This permits of drilling studpin holes and finishing both externally and internally the pro-jections for oil cups, a very valuable feature in repair shopsnot having enough of the boring to keep the machine busy onthe same operations. Motion for the feed is taken through spiral gears, one ofwhich is mounted on the spindle sleeve and the other is keyedto the horizontal pull pin shaft, on which are also mounted fourpull pin gears giving four changes of feed, transmitted to therack sleeve through the worm and worm wheel. This motion isclutched by means of a cone friction, which permits of eitherpower feed or hand elevation. The saddles can be adjusted onthe rail from a minimum distance between centers of spindles of. THE NEW DESIGN NEWTON DUPLEX ROD BORING MACHINE. -bottom surface of the rail, insuring a closer contact with heavierpressures, and the top bearing is square, the adjustment beingmade by means of a bronze taper shoe on the top, and in the rearby a gib bolted to the saddle. The adjusting nut and pinion, re-spectively to hold the saddle in any predetermined position on therail, and to permit of adjusting it crosswise, are plainly shownin the illustration. The solid end of the pinion is squared, andhas a removable ratchet fitted for the cross adjustment. The spindles are each 4% in- in diameter and revolve in bushedbearings in the sleeve, which has z bearing of 28A in. over outer diameter of the sleeve is 5^ in. The length of thespindle feed and hand vertic;il adjustment is 16 in. The spindleis fitted with a No. 6 Morse taper, threaded externally, and fitted•with circular nuts which engage the key fitted through the spin-dle and cutters
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
