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How to wind up a rope via engines (motion study)

Question asked by Reiner Fritz on Jun 5, 2012
Latest reply on Jun 6, 2012 by Jim Boland

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Hi,

I want to do a motion study with my rope-robot assembly. Therefore I have 8 engines which should be connected to a moveable plattform via ropes (see the attached assembly). I can control these engines with the LabVIEW-interface. But to drive a plattform with these engines I need a corresponding connection to each other. Still I don't know how to create a rope (or something like that), that I can connect all motors via the plattform. So is there a way to move a plattform via these engines?

I would be deeply greatful for an answer!

Thanks

Reiner

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RopeRobot_motion-study.zip30.6 MB

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Jim Boland Jun 5, 2012 1:04 PM
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Are you trying to create an animation or an analysis?

If you are creating an animation, you don't use the ropes to actually move anything. Instead you move the components with mates or keypoints and then create the ropes as in-context features that adjust themselves based on the distance between components.

If you are trying to do an analysis where you are trying to use the ropes to move the components and then determine the foreces, acceleration, etc., I don't think that you can do it, but I'll leave that for one for the analysis experts to comment on.
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- Reiner Fritz @ Jim Boland on Jun 6, 2012 8:10 AM
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  Hi Jim,
  
  thank's for your quick answer! Yes, I'm trying to create an animation, just as simple as possible. Right, and I already included movements (virtual) motors to the shaft of all 8 engines. But now I have a platform inbetween of the assembly, which I want to move due to the rotations or movements of the engines. An idea is, to create dimensionless, massless (like I sad, as easy as possible) ropes, to connect the plattform with the movements of the engines. The size and thikness of the rope doesn't matter. Maybe I can realize it with "belts and chains"?
  
  Thanks
  Reiner
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  - Jim Boland @ Reiner Fritz on Jun 6, 2012 11:35 AM
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    OK, I'm assuming that what you are trying to do is something like that shown in the attached video. I learned this technique from Deepak Gupta and while it is actually pretty easy, once you see how it is done, it is a little too much to explain in a post. The answer can be found however in the book "Creating Animations using SolidWorks" available from the SolidWorks store at http://store.solidworks.com or Amazon.com. The technique was also explained in the presentation "Smoke and Mirrors" at SolidWorks World 2012 and is available at the proceedings web site at: http://www.solidworks.com/sww/proceedings/index.htm
    
    Watch the video presentation from about 46 minutes. It is also covered in the PowerPoint on slides 54-56, but they probably will not make sense without the audio portion of the presentation.
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    Cable Roll On-Off.mp4684.5 KB
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