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Turning and boring Volume 1; a specialized treatise for machinists, students in industrial and engineering schools, and apprentices, on turning and ... turret lathes, vertical and horizontal boring - Softcover
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 Excerpt: ...of threads to the inch is ordinarily determined by referring to a table or "index plate" / which shows what the size of gears a and c should be, or the number of teeth each should have, for cutting any given number of threads per inch. Selecting the Change Gears for Thread Cutting.--Suppose a V-thread is to be cut on the end of the bolt B, Fig. 2, having a diameter of 1 inch and seven threads per inch of length, as shown at A in Fig. 1, which is the standard number of threads per inch for that diameter. First the change gears to use are found on plate / which is shown enlarged in Fig. 3. This plate has three columns: The first contains different numbers of threads to the inch, the second the size gear to place on the "spindle" or "stud" at a (Fig. 2) for different threads, and the. third the size of gear c for the leadscrew. As the thread selected as an example has 7 threads per inch, gear a should have 48 teeth, this being the number given in the second column opposite figure 7 in the first. By referring to the last column, we find that the lead-screw gear should have 84 teeth. These gears are selected from an assortment provided with the lathe and they are placed on the spindle and lead-screw, respectively. Intermediate gear b does not need to be changed as it is simply an "idler" for connecting gears a and c. Gear b is mounted on a swinging yoke Y so that it can be adjusted to mesh properly with different gear combinations; after this adjustment is made, the lathe is geared for cutting 7 threads to the inch. (The change gears of many modern lathes are so arranged that different combinations are obtained by simply shifting a lever. A lathe having this quick-change gear mechanism is described in the latter part of th...
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- PublisherRareBooksClub.com
- Publication date2012
- ISBN 10 1236327861
- ISBN 13 9781236327864
- BindingPaperback
- Number of pages70
- Rating
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