Instructions for Setting-up and Operating the Fellows Spur and Helical Gear Shapers; A Handbook for the Exclusive Use of Operators ...

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 edition. Excerpt: ...of faceplates for supporting the work will be given in the following. Cutting on the "Pull" and "Pusli" Strokes The Gear Shaper can be operated just as effectively either on the "push" or "pull" stroke. Owing, however, to the rigid design of the work-arbor, and the practice of clamping the entire unit directly to the nose of the work-spindle, it is preferable, when possible, to use the "pull" stroke. The cutting strains in this way are distributed to the main frame of the machine and are thus absorbed by the massiveness of the construction. In cutting cluster, shoulder or stepped gears, it is impossible in most cases to use the "pull" stroke, so that the "push" stroke is necessary. When slender gear blanks, therefore, are being cut on the "push" stroke, it is advisable in all cases to use a good rigid faceplate or fixture supporting the gear blanks at the rim. When cutting internal gears which are larger in diameter than the spindle-nose, the faceplate or fixture is made to rest on the support held in the apron. This prevents any distortion of the blank and holds it rigidly against the thrust of the cut. Reduced Travel Another distinctive feature of the Gear Shaper is the reduced travel of the cutter. Owing to the fact that in milling gears on a milling machine, time is saved by cutting a long string of gears at one setting, the idea has become prevalent that this is a desirable method; that it is not will be clearly understood when its disadvantages are explained. On the Gear Shaper there is no advantage in grouping the gear blanks. The reason for this is that the Gear Shaper uses a planing cutter and operates on the reciprocating principle,...