The art of generating gear-teeth by Howard Addison CoombsThe art of generating gear-teeth by Howard Addison Coombs

The art of generating gear-teeth

byHoward Addison Coombs

Paperback | February 2, 2012

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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. 1904. Excerpt: ... CHAPTER VI. GENERATING OTHER FORMS OF TEETH. Going back now ten years or more, we find a machine for generating the teeth of spiral gears forming the subject of an 1889 patent to E. P. and H. C. Walter, of Bridgeport, Conn., one view of which is shown in Fig. 34. This machine serves to illustrate the similarity spoken of above between the intermeshing method of gear generating and the process of cutting a helix, or, as it is generally called, a thread, in the lathe. The tool O is of truncated wedge shape--that is, of the form of an involute rack-tooth--and is reciprocated by the screw and reversing pulleys shown, and has no other movement. By turning the crank X which is fast on a feed screw lying directly under the blank arbor and engaging a nut on the 116 carriage T, the blank is fed along in the direction of its axis. It is also simultaneously rotated by means of the change gears Y, worm shaft B and worm wheel D. The index mechanism N provides for the cutting of multiple threads. At first glance it seems that there ought to be a fixed relation between the reciprocations of the tool and the movements of the blank, but a little study shows why it is unnecessary and also shows that the operation, although somewhat disguised, is essentially the same as that of cutting a thread in the lathe, the tool being given an additional cutting movement. It will readily be seen that the same relative action takes place whether the rotating work is moved axially past the tool or whether the tool is moved along parallel to the axis of the rotating work. The latter is the ordinary lathe arrangement, while the former is that of this machine and would be that of a lathe if the tool carriage were clamped to the bed and the headstock and tailstock were connected together and...
Title:The art of generating gear-teethFormat:PaperbackDimensions:22 pages, 9.69 × 7.44 × 0.05 inPublished:February 2, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217620361

ISBN - 13:9780217620369

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