Grant, George B. (George Barnard), 1849-1917 · Boston, Grant gear works, incorporated · leaf 83
proportion,and then find by trial a point P such that thelength PE plus the length of the perpendicu-lar PF is equal to the known center distanceEe. F will be the other focus of the re-quired ellipse. When the driving gear has turned throughthe angle PEF, from the position of thefigure at the… … Quick return Fig. 133. Fig. 134 shows the arrangement of theradii {PF = Pe of Fig. 133) in the case of afour to one quick return, and it is seen, bythe parallel lines, that the motion of the toolis very uniform, coming quickly to its maxi-mum speed, and holding a quite uniformspeed until near the…
Gearing
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