Martin, Louis Adolphe, 1880- · New York, J.Wiley & Sons, Inc.: [etc. etc.] · leaf 142
lso let BC be an element ofthe helicoid forming the surface of the screw; then (3 isthe semi-angle of the thread, and the plane ABC is thetangent plane to the helicoid at B. The angle 7 between FRICTION — APPLICATIONS TO MACHINES 125 the normal to this plane and the axis of the screw mustnow be… … Fig. 91 At every point along the mean helix of contact (suchas B) we thus find two forces acting: a normal force Nmaking an angle 7 with the axis of the screw and a tan-gential (frictional) force /iN making an angle a with aplane normal to the axis of the screw (acting in thedirection AB at B, Fig.…
Mechanics
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