Handbook for machine designers, shop men and draftsmen (1916)
Halsey, Frederick A. (Frederick Arthur), 1856-1935 · New York, McGraw-Hill book company, inc.; [etc., etc.] · leaf 148
s more than 15° the tooth parts should be figured on the normalas for spiral gears. In using the formulas for spiral gears, it shouldbe borne in mind that while P is the axial pitch for worms it is thecircular pitch for spiral gears. a = 60° to 90 Z,= I m P = nD N+2 NP N D = 71 P D-- ^ 1= X + h=Tt… … , Li Practical only when width of wheel on wheel-pitchtano = -j| Fig. I.—Notation of formulas for worm gearing. The profiles of worm teeth being the same as those of rack teeth,the same interference takes place if the wheel has less than 30 teeth.If the wheel be finished with a hob, the…
Machine design
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