Nystrom, John W. (John William), 1824-1885 · Philadelphia, J.B. Lippincott · leaf 166
189. Force by a Screw. P = Pitch of the screw,r = radius on which the force .Facts. Fi W=P:2/rr. F-WP*~ 27trJ W = F2nr … 190. Force hy Compound Screws. P = Pitch of the large screw,p = Pitch of the endless screw.R = radius of spur-wheel for the endlessscrew W: F^^Rr : Pp. F = WPi W= F^nRr 4:n*R r9 Pp On the spur-wheel is a cylinder by whichthe weight W is wound up, the formula willbe r = radius of the cylinder, and…
Mechanical engineering · Engineering
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