Grant, George B. (George Barnard), 1849-1917 · Boston, Grant gear works, incorporated · leaf 65
allgears of 26 teeth, or smaller, should be madein this way, but the correction is not strictlynecessary for gears of more than 20 teeth,unless particularly nice work is required. Fig. 100 shows the proper construction of agear of 21 or more teeth, and Fig. 101 showsthat of a gear of less than 21… … 118.—CLEARANCE OF WORM TEETH. There is another practical point that is sel-dom recognized, and that is that worm teethshould have clearance (40), for there is noreason for clearing spur teeth that will notapply quite as well to any other kind. The clearance is easily obtained by makingthe tooth of…
Gearing
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