. American engineer and railroad journal . KM i;\ \ can readily be changed by changing the bearings. The boringbar la so supported that II is very rigid. The lower end isclamped Into a long bearing In the ram and the bar Is securelysupported by a bearing In the table |uat under the work andalso by a bearing In the upper arm. The-machine has a wideof feeds, and weighs about 16,000 lbs. The following tests, which were made o le of these slot- will give some Idea Of Ita Btrength ami eaparily: A steeldriving box was Blotted out in a circle 1194 ins. in diameterand with a cut Ll% ins. long
. American engineer and railroad journal . KM i;\ \ can readily be changed by changing the bearings. The boringbar la so supported that II is very rigid. The lower end isclamped Into a long bearing In the ram and the bar Is securelysupported by a bearing In the table |uat under the work andalso by a bearing In the upper arm. The-machine has a wideof feeds, and weighs about 16,000 lbs. The following tests, which were made o le of these slot- will give some Idea Of Ita Btrength ami eaparily: A steeldriving box was Blotted out in a circle 1194 ins. in diameterand with a cut Ll% ins. long. A roughing and a finishing cutwere taken oft all surfaces, Including the corners, In 28 min-utes, The roughing cut was %-ln. deep with a 14-in. feed, andthe machine made 16 nillinn strokes per minute. After thelesi 16 chips were picked up at random and were found toweigh 1 lbs, Another cut %-in. deep with .x-in. feed was I on the same how The cut was 11 V, ins. long, and in 16 minutes the metal was removed tor 22 ins. around the WO. OAB umii BOKEB.— nuos. The ear wheel boring machine, which is illustrated in , is fitted with a facing attachment that is of a rather noveland interesting design and is very rigid. The outer endis fitted with a bushing which guides the boring bar. Thecro - teed is geared and the vertical feed is operated by boring bar is 4V4 ins. in diameter, is fitted with a Morsetaper socket, and is provided with long bearings, which areadjustable for wear. The spindle is i% ins. in diameter and has a 2%-in. holerunning its full length for chips or for the boring bar. It isprovided with a larger roller thrust bearing, and is fitted withtaper adjustable bearings for taking up the wear. The fric-tional resistance is therefore small and the spindle is entirelyfree from vibration. The back gears can be thrown in by thelever, wnich is shown on the right hand side to the rear. Thechuck is .secured directly to the large driving gear
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
