Page 85 - Mechanical Engineer's Data Handbook
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74 MECHANICAL ENGINEER'S DATA HANDBOOK
Simple harmonic motion cam
(2:)
Velocity v= -
Lift y = d( 1 -cos 6)
where: d =eccentricity. Acceleration a=O during rise and fall but infinite at
direction reversal.
Velocity u = od sin 6
Acceleration a = dd cos 6 Constant acceleration and deceleration cam,
Maximum lift y,, = d roller follower
The shape of the cam is a circle.
The following refers to the motion of the roller centre.
Lift y=2ym,, ( - 61)2 (for first half of lift).
f
y = 2ym,, [ - rey] (for second half of lift).
Velocity u=40ymx6 (for first half of lift)
6LX
-
second
half
6)
(for
u = 4oymar 7 of lift)
(emax
emax
Acceleration and deceleration a = 4w2y,x (constant)
C x
I
Constant velocity cam, knife-edge follower
where: 6,,, = angle for y,,,.
Axial cam vace cam)
The cam profile is on the end of a rotating cylinder and
the follower moves parallel to the cylinder axis.
