Page 455 - Marks Calculation for Machine Design

P2: Sanjay
P1: Shibu/Rakesh
15:34
January 4, 2005
Brown˙C10
Brown.cls
MACHINE MOTION
1 437
Cable
3
P
v P
4

2
v W
W (load)

FIGURE 10.26 Complex pulley system.

Therefore, the velocity (v W ) of the load (W), which is equal to the velocity of the center
of the lower pulley (2), is the fraction (1/x) of the velocity (v P ) of the force (P) and given
by Eq. (10.59) as
1
v W = v P (10.59)
x
where (x) is determined for specific diameters of all four pulleys and for a particular distance
between pulleys (3) and (4).
This completes the chapter on machine motion and thus we come to “The End” of the
ten chapters of this first edition of Marks’ Calculations for Machine Design. It has been a
pleasure uncovering the mystery of the formulas in machine design that are so important to
bring about a safe and operationally sound design. Having said so, it must also be mentioned
that for you it is just the beginning of a creative odyssey. The machines you would design
based on the knowledge gained from this book, and the new ideas, theories, equations, and
techniques you would come up with would go to increase the volume of books like this
considerably in each subsequent edition. Best wishes for your designs.