. Railway mechanical engineer . nufacturers have been guidedby the Safety First principle and have carefully guardedall exposed gears and moving parts. These machines are designed especially for reboring loco-motive cylinders and valve chamber bushings. They canbe used with one or both cylinder heads removed and areeasily and quickly set up. The crosshead blocks are boltedto the cylinder with the cylinder head studs and the liarrevolves in the sleeves supported and centered by set screwsin the crossheads. When boring with only one head re-moved, the expanding chuck and pin, having five sets of
. Railway mechanical engineer . nufacturers have been guidedby the Safety First principle and have carefully guardedall exposed gears and moving parts. These machines are designed especially for reboring loco-motive cylinders and valve chamber bushings. They canbe used with one or both cylinder heads removed and areeasily and quickly set up. The crosshead blocks are boltedto the cylinder with the cylinder head studs and the liarrevolves in the sleeves supported and centered by set screwsin the crossheads. When boring with only one head re-moved, the expanding chuck and pin, having five sets oftaper gibs to fit in stuffing boxes of various diameters, isused to support the crank end of the bar. The power is applied to the bar by means of a backgeared driving power having a two speed quick change geardrive. This is a recent improvement and is of particularadvantage where the same bar is used to rebore cylindersand valve chamber bushings of various sizes. The quickchange is accomplished by simply pulling out a slip Portable Boring Bar for Cylinders and Valve Chambers shifting the primary pinion out of gear and driving by theintermediate shaft. There has also been designed an im-proved tool holder using high speed cutters for extra hardservice. The cutter head is fed by means of an automaticfeed case having two changes of feed controlled by a slippin. This is also completely encased as shown in the en-graving. For setting the bar up in valve chamber bushings, a noveldevice is used enabling the operation to be quickly and ac-curately performed. This consists of a set of taper conesleeves in halves, fitting in the counterbore, supporting thebar in a central position while the blocks and crossheadsare being bolted up, after which the cones are removed andthe bar is ready for reboring. The sleeves being taper, oneset can be used in bushings of various sizes within theirrange. These portable boring bars are manufactured by E. T-Rooksby & Company, 431-439 X. 11th St., Ph
Size: 1926px × 1297px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
