Grant, George B. (George Barnard), 1849-1917 · Boston, Grant gear works, incorporated · leaf 68
the normal sec-tion. The order of the contact is certainlyvery close, resembling that of two surfaces. The worm is limited in length, for thesides of the teeth cannot slant inward fromthe normal to the axis. The end tooth m inFig. 102 cannot be used, for it will destroythe teeth of the gear as it… … bearings wear, unless it is itself worn thesame amount. It is doubtful if this form ofgearing has any advantage over the plainspiral gearing, except when new and in per-fect adjustment. 123.—THE PEN WORM AND GEAR. If the hob and the worm are shaped bythe pin-shaped revolving milling tool b of JPin…
Gearing
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