Thomas, Hugh Kerr · New York : McGraw-Hill Book Co. · leaf 36
the worm drives the wheelor the wheel the worm; with a square thread, however, such agliding angle is only possible if the proportions of the worm aresuch that they are satisfied by the equation 71 d = L (18) The gear ratio and the dimensions of the worm and wheel may,and generally w^ill, make this… … working surface of the thread is shown in perspective by theplane a e dh and, in a square-threaded worm, the angle a 6 c isthe gliding angle of the rubbing surfaces. As drawn, how^ever,this angle is much less than 45 degrees and such a gear cannotbe reversible, except to a slight degree. Now…
Gearing, Worm
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