. Railway mechanical engineer . ew of Wheel-head Showing Bearing Adjustment Screws index gear represents a work diameter reduction of .00025in. and there is an automatic feed range from .00025 in. diameter reduction at each reversal of the 15-hp. motor, designed to operate at a constant speed of1,200 r. p. m., is required to drive the new Norton grinder. Collapsible Tap of Simple Rugged Design THE original and outstanding feature of the new col-lapsible tap, made by die Rickert-Shafer Company,Erie, Pa., is the method of withdrawing the chaserswhen the work has been tapped to th
. Railway mechanical engineer . ew of Wheel-head Showing Bearing Adjustment Screws index gear represents a work diameter reduction of .00025in. and there is an automatic feed range from .00025 in. diameter reduction at each reversal of the 15-hp. motor, designed to operate at a constant speed of1,200 r. p. m., is required to drive the new Norton grinder. Collapsible Tap of Simple Rugged Design THE original and outstanding feature of the new col-lapsible tap, made by die Rickert-Shafer Company,Erie, Pa., is the method of withdrawing the chaserswhen the work has been tapped to the required depth. Themanufacturers claim it to be positive in action, inasmuch that the chasers will be released at exactly the right illustrations show the manner in which this is ac-complished. At the point of release the force of the cut pullsthe head from the locking pins and revolves it. This actioncauses the cams on the core to act and pull the core back,drawing the chasers in the head and clearing them from the. RICkert-Shafer Collapsible Tap as it is impossible for it to stick. This is a decided advan-tage in all cases, but especially so where work has to betapped close to the bottom of the hole, in which case theoperator can place full reliance upon the tool, as it is .stated View Showing Mechanical Details of Collapsible Tap work. It will be seen that in this tool no dependence isplaced upon springs for the purpose of collapsing. Attention is also directed to the method of making adjust-ments, which allows these to be made to the fractional thou-sandths. A guarantee accompanies these taps that they will 804 RAILWAY MECHAXICAL ENGIXEER Vol. 94, No. 12 hold to size, witliin the most exacting limits, and that sizinghand taps can absolutely be dispensed with. These tools have hardened and ground wearing parts andscientiticallv accurate chasers. Ihev are manufactured in sizes from 1 in. to 10 in., or larger, and can also be com-bined with boring, reaming or chamf
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
