. Railway mechanical engineer . andpinion. One set of one inch collet bushings is provided. The hexagonal turret is mounted on a substantial slidemoving directly on the ways and provided with taper gibsfor adjustment. The turret binding bolt has a 1% in. holeto permit the bar to pass through. Automatic adjustablestops are provided for disengaging the feeds. The doubleplate apron is attached to the slide, being driven from thefeed box bv a lead screw. Two half nuts are engaged withthe lead screw for threading, and bevel gears, driven by thespline through a friction, are used for turning the rel
. Railway mechanical engineer . andpinion. One set of one inch collet bushings is provided. The hexagonal turret is mounted on a substantial slidemoving directly on the ways and provided with taper gibsfor adjustment. The turret binding bolt has a 1% in. holeto permit the bar to pass through. Automatic adjustablestops are provided for disengaging the feeds. The doubleplate apron is attached to the slide, being driven from thefeed box bv a lead screw. Two half nuts are engaged withthe lead screw for threading, and bevel gears, driven by thespline through a friction, are used for turning the feeds are automatically disengaged at the desired pointsand are so interlocked that they can only be engaged sepa-rately. For relieving the middle portion of the bolt, a singlecutter roller box mill of special design is provided as shownin Fig. 3. For threading (Fig. 4), a modern automatic self-openingdie head is so controlled by the lead screw as to produce ac-curate threads of uniform pitch and continuous lead on both. Fig, 2—La««iler,Millholland Model A Machine Equipped for Cutting Side Staybolts from Bar Stock 285 2S6 RAILWAY MECHANICAL ENGINEER 96, No. 5 ends of the ImjU. As the die head comiiletes the first threadedportion, the machine is speeded up Ijy the headstock friction,passed quickly across the relief portion and then slowed upto the proper speed for continuing the thread, the lead screwlieing engaged until threading is completed. Staybolt threadsof 11 and 12 per inch, and 2j and .^ millimeter pitch mayi)e cut by varying the change gears in the feed box. Thecross slide provides for necking and cutting off staybolts. The machine is provided with bar feed which moves thestock against a stop when the automatic chuck is two sets of chasers the die head has a capacity to cutJs in. to IV-i in. bolts to any standard pitch desired. Bolts12 in. long can be turned. Model B Machine The Lassiter-Millholland !Model B staybolt machine isshown in F
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
