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Title: |
1903 Article-James J. Guest & Co., Cutter Grinder |
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Source: |
Emery Grinding Machinery, 1903, pgs. 108-113 |
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Insert Date: |
11/24/2015 12:31:42 PM |
To grind tapers, the swivel table is set over so that it is not parallel to the main slide. It is usually required that some standard taper should be reproduced; the best procedure in this case is to place the copy between the centres (see figs. 93 and 94). The copy is then traversed in front of the indicator and the pointer watched, and the fine adjustment screws of the swivel table moved until the indicator pointer remains stationary whilst the copy is traversed. The swivel table is then clamped in position by the eccentric locks (which have not the tendency to turn the table that a bolt lock has). It is very important in taper work that the knee should be at the correct height, and that the swivel table should—when set in any position—be certain to remain there; this is the object of an eccentric lock. By this means all work, of whatever size or diameter, when ground on the machine, will have the same taper per foot or the same angular taper as the copy. These remarks apply to all taper work on any machine; for if the centre of the emery wheel is above or below the centre line of the article being ground, or should there be any tendency for the swivel table to rock about, it would be quite impossible to obtain a number of articles with identically the same taper.
Fig. 94 shows the position of the water guards W G of the work-table, two of which are shown shaded, and the figure indicates how they overlap and pass one another, and also how they clear the head and tail stocks. The water guards are clearly seen at W G in fig. 93. The change from one length of work to another is effected by simply adjusting the headstocks.
Figs. 93 and 94 show the method of setting the table to guide parallel on a desired taper. The clamp C is first unloosened and the table set by hand and eye nearly to the correct position. The clamp C is then tightened, and the fine adjustment screw S, fig. 94, used to obtain precision. The taper desired is then obtained quickly and accurately by changing the nut from one socket to the other; the arrangement works through an angle of 45 degrees, so that all tapers can be accurately set. The table, when adjusted, is clamped by the eccentric locks E, F, fig. 94, which do not disturb the adjustment. |
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