Mechanical movements, powers, devices and appliances (1901)
Hiscox, Gardner Dexter, 1822?-1908 · New York, N. W. Henley & company · leaf 31
25. THE SCREW. All measures in equalunits or inches. W = P X [2 X rX 3-1416) Pitch of screwP z= W X pitch of screw2 X r X 3.1416 … 26. WORM GEAR or ENDLESS SCREW. P = power. r = length of crank. R = radius of pitch line of gear. Jf =. pitch of screw. r = radius of winding drum. W= Pxrx6.28xR P = W X / X ^6.28 X /- X R w / X r if screw is double-thread.
Mechanical movements
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