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1-Visitor
October 11, 2012
Question

Mechanism cam liftoff with follow

  • October 11, 2012
  • 2 replies
  • 1219 views

I have an assembly involving a cam constrant. I have a cam constraint set which allows two parts which are not initially in contact to follow a predescribed motion once they come into contact during convergence.


NOW


When I move the cam features away from each other I cannot get them to stay in contact during the motion seen in convergence. Instead the "follower" stay completly depressed while the cam rebounds. I do have allow liftoff set since I am not trying to keep them in contact through the whole motion an I do need separation after the follower returns to its initial position.


Any takers?


Mechanisms, WF4


Thanks,


Matt


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2 replies

8-Gravel
October 11, 2012
I have a colleague with the following Mechanism problem.

I have an assembly involving a cam constrant. I have a cam constraint set which allows two parts which are not initially in contact to follow a predescribed motion once they come into contact during convergence.

NOW

When I move the cam features away from each other I cannot get them to stay in contact during the motion seen in convergence. Instead the "follower" stay completly depressed while the cam rebounds. I do have allow liftoff set since I am not trying to keep them in contact through the whole motion an I do need separation after the follower returns to its initial position.

Mechanisms, WF4

Thanks,

Matt

Matthew.Tyler@Emerson.com


1-Visitor
October 12, 2012
Without being familiar with the Pro/E cam feature...

Is there any reason for the follower to return? Some spring or
something?
And did you check the timescale? I.e. inertia may be the cause.

Best regards,
Patrick Asselman