Page 114 - Tribology in Machine Design

100 Tribology in machine design

and so

To calculate the perpendicular distance z we have

and

and so

Substituting, the above equations become

from this

because P = Q

B. Graphical solution
We now produce the lines of action of P and Q to intersect at the point C,
and suppose the distance of C from the vertical guide through B is denoted
by d. Then, taking moment about C

By measurement (if the figure is drawn to scale) d=4.8m

4.2.2. Friction stability
A block B, Fig. 4.5, rests upon a plate A of uniform thickness and the plate is
caused to slide over the horizontal surface C. The motion of B is prevented