. Railway mechanical engineer . with a fixed relation to the bedare lubricated by a continuous flow system by which filteredoil is circulated through a pump directly connected to themain drive shaft. This pump operates at all times whenthe main driving wheel is in motion. The 24-in. driving pulley has a 5y2-m. face and shouldrun at 405 The best source of pow=er is a constantspeed motor of 15 hp. The weight of the machine is28,000 lb. net and the floor space required with motordrive is 11 ft. by 13 ft. The height of the machine withthe bars in the extreme upper position is 130 in. ARCH B
. Railway mechanical engineer . with a fixed relation to the bedare lubricated by a continuous flow system by which filteredoil is circulated through a pump directly connected to themain drive shaft. This pump operates at all times whenthe main driving wheel is in motion. The 24-in. driving pulley has a 5y2-m. face and shouldrun at 405 The best source of pow=er is a constantspeed motor of 15 hp. The weight of the machine is28,000 lb. net and the floor space required with motordrive is 11 ft. by 13 ft. The height of the machine withthe bars in the extreme upper position is 130 in. ARCH BAR DRILLING MACHINE The six-spindle arch bar drilling machine illustrated, whichis made by the Foot-Burt Company. Cleveland, Ohio, is espe-cially adapted to the hea\-)- duty drilling of modem truckarch bars. For the sake of greater rigidity the heads ofthe machine which carr\- the spindles are bolted securely tothe main cross-rail and are adjustable for the taking of dif-ferent sizes of arch bars. The tal;]e is of the heavv box. Foot-Burt Six Spindle Arch Bar Drilling Machine. section tyjw, well riblx;d, and is fed up to the spindles bymeans of heavy racks and pinions. The pitch line of theseracks and pinions is directly under the center of the ways of the table are also directly in line with thecenter of the spindles, thereby eliminating all overhang tothe table and allowing it to feed up directly against thecenter of tlic s()indles. The uprights are of heavy box sec- 360 RAILWAY MECHANICAL ENGINEER VcL. 92, No. 6 tion t)pc, as well as tilt cross-rail, which is strongly ribbedto withstand unusual strain. ihe spindles arc carried in bearings which are bronzeImshed, and these bearings are adjustable vertically 5 take care of the different lengths of drills. All spindlesare fitted with ball thrust bearings. The driving bevel gearsfor the spindles are made of steel forgings with hardenedplane-d teeth. The machine is now arranged with four changes of feedsbv mean
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
