[Fig. 2074] represents a Whitworth machine in which the cutter is carried in a vertical spindle carried in a sliding head. a is the driving pulley, b a pair of bevel-gears, and c a pinion driving the cutter spindle d, the cutter being at e. The cutter spindle has journal bearing at each end in arms upon the sliding head f, which is operated along the slideway of h by the gear-wheel g, receiving motion from the worm at c; at k is the index wheel, the wheel to be cut being carried on its shaft at m. The head n, carrying the index-wheel shaft, may be moved along the bed on which it slides by the handle p, which operates a screw within the bed, and engaging a nut on the under side of n. The worm for the worm-wheel k is carried beneath the wheel by a bracket from n, and being on a splined shaft moves with n. p is the handle for the divisions, the latter being obtained by means of change wheels at j, which connect with the worm shaft. By employing change gears the handle p makes a complete turn for any division, and is locked in a recess, which determines when an exact turn has been made. The range of a machine of this design is very great, because of the length of the bed on which the head n slides, which may be longer than would be practical if it stood upright.
[Fig. 2075] represents a gear planing machine, shown with a bevel-gear in place. The main spindle is horizontal upon a fixed head, and has its dividing mechanism at the back of the machine. A single pointed tool is used in a slide rest, operated (by crank motion) upon the horizontal slideway shown, which may be set at any required angle for bevel-wheels. The cut is carried from the point to the flank of the tooth, and is put on by a rod and ratchet motion, the rod striking against the stop seen beneath the cross slide for the slide rest, and on the side of the horizontal slideway.
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Fig. 2076.
Fig. 2077.
[Figs. 2076], [2077], [2078], [2079], [2080], [2081], and [2082] represent different views of a gear-cutting machine, which consists of a bed plate a a, [Figs. 2077], [2078], and [2079], having an extension at end a2, to support the hollow cylindrical column a3, which carries an overhead shaft a, at one end of which is a four-step cone a3, for driving the cutter feed motions. At the other end are the tight and loose pulleys for driving this shaft, upon which is also a series of grooved pulleys a5, arranged in the form of a cone. The object of this is to drive the cutter. At the base of the column a3 is a corresponding series of grooved pulleys, also arranged in the form of a cone a6. A round belt is employed. The shaft on which a6 is placed extends through the column, and on its opposite end a grooved pulley is also placed. This serves to drive a belt which, passing over a series of idle pulleys, as will be seen by reference to [Figs. 2076] and [2077], drives the rotary cutter.