Thomas, Hugh Kerr · New York, McGraw-Hill Book Company, Inc.; [etc., etc.] · leaf 67
6 54 WORM GEARS Worm: Number of threads 5 Pitch diameter <• 3.25 in. Pitch circumference 10.21 in. Length of worm 5 in. Lead 5. 9375 in. Lead angle 30° 11 Thread angle • 60° Length of thread per rev 11.812 in. Rubbing speed 18.5/. p. s. Worm Wheel: No. of teeth 39 Pitch diameter , 14.75 in.… … BFJ speed was also nearly constant at 18.5 ft. per second. Conse-quently the heat generated in friction (from equation 68, Chap-ter IX) was 12.6 B.T.U. per minute and (from equation 73,Chapter IX) the area of rear axle surface should be 8.6 sq. ft. THE WIDTH OF THE WORM WHEEL 55 The actual surface…
Gearing, Worm
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