A cam is to be desinged for an automated part loader.Using the motion equations,

Question

A cam is to be desinged for an automated part loader.Using the motion equations,construct a chart that tabulates follower displacement versus time and cam rotation. Also plot this data when the prescribed motion for this application is as follows:

    1) Rise 50mm in 1.5sec using the constant velocity motion scheme.

    2) Return in 2.0 sec using the cycloidal moyion scheme.

    3) Dwell for 0.75 sec .

    4) Repeat the sequence.

a) Select a motion scheme that you recommend to the desinger ,And why.

b) Calculate the highest velocity,Acceleration and jerk that part would experience under that motion sheme.

c) Sketch a displacement curve ,and label the points.

Explanation / Answer

1)the distance is d = 50 mm = 50 x 10^-3 m

the time is t = 1.5 sec

the velocity is v = (d/t)

2)the velocity in time t1 = 2.0 sec is

v1 = (d/t1)

3)the velocity in time t2 = 0.75 sec is

v2 = (d/t2)

let a be the acceleration

we know that

v2^2 - v1^2 = 2aS

where S is the distance travelled

or a = (v2^2 - v1^2/2S)

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