. Appleton's dictionary of machines, mechanics, engine-work, and engineering. shaft relatively to the segment ofcogs should be such that the carrying-wheel will be turned for removing the threaded screw and pre-senting a blank when the carriage is farthest from the jaws. And the number of pins s on the wheel Imust be equal to the number of times it is intended that the chasers or dies shall pass over the blankto complete the thread; but if desired this number may be doubled, trebled, &c, by having two, three,&c, pins u on the other face of the wheel. It is, however, preferred to have it as des
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. shaft relatively to the segment ofcogs should be such that the carrying-wheel will be turned for removing the threaded screw and pre-senting a blank when the carriage is farthest from the jaws. And the number of pins s on the wheel Imust be equal to the number of times it is intended that the chasers or dies shall pass over the blankto complete the thread; but if desired this number may be doubled, trebled, &c, by having two, three,&c, pins u on the other face of the wheel. It is, however, preferred to have it as described. In thisway it will be seen that the carrying-wheel carries the blanks towards the jaws and inserts the blankin the open dies and moves it back to form the thread, and that these motions are repeated a givennumber of times until the thread is completely chased or cut, and that when completed the carrying-wheel is turned far enough around to remove the threaded screw and present a blank to the jaws toundergo the same series of operations. 3273. 3273. !<£. While the screw is being cut or chased it is held in its hole in the rim of the carrying-wheel by meansof a roller v within the rim of the wheel, and turning on a stud-pin at the end of a lever w\ which turnson a fulcrum-pin x, the roller being held against the inner periphery of the rim of the wheel by apressure-screw y that bears against the lower end of the lever, so that as the blank is carried up bythe wheel to be presented to the dies, the pressure of this roller against the head holds it firmly in therim of the wheel. The machine can be made double for threading two screws at one and the sametime, as shown in the figures, by having two carrying-wheels on the same shaft, and two mandrels withtheir jaws, dies, and sliding-rods, the two mandrels being geered together by two cog-wheels z z. 3274,
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
