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Joint issues....

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  • V Offline
    Valkrist
    last edited by 6 Mar 2010, 03:37

    Ok, I had a lot of stuff here, but I'm editing it out. I started from scratch, and now the cylinders I made are ALL acting as if they are static, but none of them are. I'll post the file if I can to show what I mean. I want the two front wheels to drive forward and backward, so that they will control turning as well as drive. The third wheel is just a free turning caster wheel. I can't seem to get this put together without something being permanently frozen in place.


    Here it is without joints or groups, why are the cylinders static when simulated?

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    • H Offline
      hpnisse
      last edited by 6 Mar 2010, 12:51

      Hello.

      The biggest problem in the model is that it´s to small. When objects are to small the physics won´t work.
      But if you scale it up two or three times the physics will work, and the physics joints will work correct when you add them.

      I downloaded the model and change it, scale the vehicle up and add physics joints.
      The script o drive the vehicle is in the "main body".

      Robot Design.skp

      Hope this is what you ask about, sorry for my bad english.

      You drive with the arrow keys.

      ` /hpnisse`
      ` Windows 7 U -Sketchup 8 -SketchyPhysics 3.2-Dec2 - from Sweden`

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      • V Offline
        Valkrist
        last edited by 6 Mar 2010, 20:11

        Oh, wow! Thanks so much for that. I didn't think the size would be an issue like it was. I just made the model to scale and figured it would work. Now I can really start planning and adjusting my design. Thank you, again!

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        • V Offline
          Valkrist
          last edited by 7 Mar 2010, 03:24

          Ok, so with the problem figured out I started over with a more detailed model. I have everything set up fine, everything works like it should I added some large hidden primitives that are set to ignore to stiffen up the caster wheel. That worked great. Now I just need some tips on how to make this simulation more accurate. The one hpnisse showed me worked great, it was very smooth. I know that one was scripted, I don't know much about scripting. I just have the left wheel's hinge set to joyLY and the right hinge set to joyRX as controllers.


          Robot Design.skp

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          • H Offline
            hpnisse
            last edited by 8 Mar 2010, 16:19

            Good that I help you a little bit.
            But what do you mean by "more accurate" ??? maybe I could help you more`!

            ` /hpnisse`
            ` Windows 7 U -Sketchup 8 -SketchyPhysics 3.2-Dec2 - from Sweden`

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            • V Offline
              Valkrist
              last edited by 9 Mar 2010, 21:09

              I actually fixed it already. Thank you for responding though. The wheels were acting strange because they were cylinders. I changed the physics shape to sphere and everything got much smoother.

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              • H Offline
                hpnisse
                last edited by 9 Mar 2010, 21:40

                Funny that you fix it by yourself 😛
                The best way to learn something on computer is to click on everything you see 😄

                /hpnisse

                ` /hpnisse`
                ` Windows 7 U -Sketchup 8 -SketchyPhysics 3.2-Dec2 - from Sweden`

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