AnsweredAssumed Answered

Event Based Motion

Question asked by Scott Baugh on Feb 17, 2011
Latest reply on Feb 23, 2011 by Scott Baugh

Like • Show 0 Likes0
Comment • 6

I am looking for someone that actually understands this function of SW?

It was recommended to me to use Event based motion for the large Animation I have to do. So I am starting off some what small, but I am havign a really hard time understanding this as well as making anything work.

First question I have at the moment is - Can you Hide/Show a part or parts?

I do have the Step-by-Step book, but its not been a lot of help at the moment.

How do you know what action to use? I know how I want my assembly to move, but how do I define that in this type of motion?

The assembly is of a multi-cavity mold Sectioned to see one of the parts. I want the Piece part to appear, then the mold to open, and hte piece part to stay on the core, then the stripped plate to push the part off as well as the ejector pin and the part fall away and the stripper plate closes back and the mold close... seems simple enough, but I can't get it started.

Regards,

Scott

No one else has this question

Outcomes

6 Replies

Shrikant Savant Feb 17, 2011 3:51 PM
Mark Correct
Correct Answer
Hi Scott,

If you know the times at which various movements are supposed to take place and if all you want to do is manipulate the display attributes (show, hide, transparency, section) or just move parts from one point to another, then you don't need event based motion. Simple Animation should work for you. Event based motion is for doing full dynamic simulation i.e. you are interested in displacements, acceleration, forces, torques etc. and you can't use time-based simulation because you don't know the times at which various events occur.

Regards,
Shrikant
Like • Show 0 Likes0
Actions
- Scott Baugh @ Shrikant Savant on Feb 18, 2011 12:10 AM
  Mark Correct
  Correct Answer
  Thanks for your reply!!
  
  I really thought I would have had more by now.
  
  Anyway - I really don't care about the simulation portion of the animation... if I was to use real times, the whole process would take just a couple of seconds.
  
  I am using Linear motors now and that allowed me to open the mold, but now when I add another motor to push the Stripper plate out .125, the core closes back to its original location. So I tried adding a Distance mate that kept the Core from returning to the original spot. No good, it still closed the core and while the stripper plate and the piece part was getting ejected. I checked for other mates to try and understand what was going on and I can't see any reason why the core would return... unless its because of the original linear motor I added... I turned the original motor off and the new one on, thinking that was the problem, but no dice. I worked for 4-5 hours at home tonight trying to figure it out... I finally just gave up. I don't remember Animation being this darn hard.
  
  Regards,
  Scott
  Like • Show 0 Likes0
  Actions
  - Shrikant Savant @ Scott Baugh on Feb 18, 2011 9:51 AM
    Mark Correct
    Correct Answer
    From your description, it is not clear whether you are following the right steps or not. Can you post your model or some pictures?
    Regards,
    Shrikant
    Like • Show 0 Likes0
    Actions
    - Scott Baugh @ Shrikant Savant on Feb 18, 2011 11:08 PM
      Mark Correct
      Correct Answer
      Let me ask you like this then
      
      If I have a Linear motor 1 that pushes Plate 1 in one direction and another Plate (we will call it Plate 2) on that same first sub-assembly has another Linear motor 2 pushing it the opposite direction, after Plate 1 stops. I turn off Linear motor 1 and then turn on Linear motor 2, does Linear motor 1 automatically reset the location of Plate 1?
      
      Should Linear Motor 1, be suppressed or left on, to keep Plate 1 in its position?
      
      Does that make more sense?
      Thanks,
      Scott
      Like • Show 0 Likes0
      Actions
      - Shrikant Savant @ Scott Baugh on Feb 22, 2011 4:34 PM
        Mark Correct
        Correct Answer
        Hi Scott,
        
        Suppressing a motor removes the motor completely from the model - it is as if the motor was never there in the model. Whereas, turning off the motor at a particular time just deactivates that motor at that time. It would be included in the model before you turned it off. Note that motors create constraints that the solver always tries to satisfy regardless of any load or resistance.
        
        In your example, if plate-2 is attached to plate-1 directly or indirectly in the subassembly, then once you turn off motor-1 the resultant motion of plate-1 will be decided by two factors- the motion plate-1 had when motor-1 was turned off and the motion plate-1 receives due to the movement of plate-2. If you want to keep plate-1 in its position, you need to edit the motor at that time and set its function to be equal to zero. This will lock the plate in that position and will not move even if plate-2 moves. Of course, if the motion of plate-2 contradicts the locking motion of plate-1 then the solver will fail but that would be due to contradictory input. You will have to correct that.
        
        You mentioned in your previous email that you know the times at which various events take place. Have you tried dragging the parts in their respective positions at proper times and adding part position keys and then running the "Animation" study type?
        
        Hope this helps,
        -Shrikant
        Like • Show 0 Likes0
        Actions
        Scott Baugh @ Shrikant Savant on Feb 23, 2011 9:15 AM
        Mark Correct
        Correct Answer
        At the moment I can't go back to my original problem, since I had a major job land in my lap the other day, but I think you might have answered my question on the motor scenario. How you describe it sounds like that is what I am doing wrong. I will have to test it out when I can get back onto this job, hopefully next week.
        
        I know the sequence of events to happen, but the entire process only takes a few seconds in the real world. I am slowing it down to allow others to make sense of it all. Some things I still want to happen quickly, while others i want to slow down. Some items are simple reactions to another part moving. The example I am working with at the in this example is a Multi-Cavity mold. So you can imagine the cavity filling up (Hidden to shown Part), Plate 1 (Core) opens, Plate 2 (Stripper Plate) Pushes the Piece part off the core and the all the pieces fall indepedently. I have seen the example of the marbles running down the ramp, would be interesting to create some thing like that when the parts fall into a bin or a conveyor of some sort. Plate 2 closes against Plate 1 and Plate 1 closes to Cavity plate (Fixed) and the Cavity refills and the process starts over again. I might have to fill the cavity a couple of times, not sure yet since this is only the first piece to a much larger puzzle I am trying to create.
        
        Thanks for the help!!! I will have to test out what you mention here probably next week.
        
        Cheers,
        Scott
        Like • Show 0 Likes0
        Actions

Event Based Motion

Outcomes

Related Content

Recommended Content