# Launching URDF model in gazebo, when I press the "run" key, the model is in chaos? How to solve the problem?

**URL:** <https://discourse.openrobotics.org/t/launching-urdf-model-in-gazebo-when-i-press-the-run-key-the-model-is-in-chaos-how-to-solve-the-problem/48723>\
**Category:** Gazebo Help\
**Tags:** helloworld\
**Created:** [March 15, 2018, 12:28pm UTC](https://discourse.openrobotics.org/t/launching-urdf-model-in-gazebo-when-i-press-the-run-key-the-model-is-in-chaos-how-to-solve-the-problem/48723 "2018-03-15T12:28:16Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![848386626\_gazebo](https://sea2.discourse-cdn.com/flex022/user_avatar/discourse.openrobotics.org/848386626_gazebo/32/27789_2.png) [@848386626\_gazebo](https://discourse.openrobotics.org/u/848386626_gazebo)\
**Post date:** [March 15, 2018, 12:28pm UTC](https://discourse.openrobotics.org/t/launching-urdf-model-in-gazebo-when-i-press-the-run-key-the-model-is-in-chaos-how-to-solve-the-problem/48723/1 "2018-03-15T12:28:16Z")

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![2018-03-15%2020%3A27%3A23%E5%B1%8F%E5%B9%95%E6%88%AA%E5%9B%BE](https://us1.discourse-cdn.com/flex022/uploads/ros/original/1X/0f45c21fc64d936a7499f57c0cccaa567f1868f8.png)

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**Author:** ![848386626\_gazebo](https://sea2.discourse-cdn.com/flex022/user_avatar/discourse.openrobotics.org/848386626_gazebo/32/27789_2.png) [@848386626\_gazebo](https://discourse.openrobotics.org/u/848386626_gazebo)\
**Post date:** [March 15, 2018, 12:31pm UTC](https://discourse.openrobotics.org/t/launching-urdf-model-in-gazebo-when-i-press-the-run-key-the-model-is-in-chaos-how-to-solve-the-problem/48723/2 "2018-03-15T12:31:58Z")

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In Rviz ,the URDF model can run well, and every joint runs well.

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**Author:** ![jborrego](https://avatars.discourse-cdn.com/v4/letter/j/57b2e6/32.png) [@jborrego](https://discourse.openrobotics.org/u/jborrego)\
**Post date:** [March 15, 2018, 2:04pm UTC](https://discourse.openrobotics.org/t/launching-urdf-model-in-gazebo-when-i-press-the-run-key-the-model-is-in-chaos-how-to-solve-the-problem/48723/3 "2018-03-15T14:04:43Z")

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As far as I know, there may be several reasons for it.  
What do you mean by chaos? Twitching behavior?  
Maybe it would be useful if you could provide the URDF of the robot.

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**Author:** ![848386626\_gazebo](https://sea2.discourse-cdn.com/flex022/user_avatar/discourse.openrobotics.org/848386626_gazebo/32/27789_2.png) [@848386626\_gazebo](https://discourse.openrobotics.org/u/848386626_gazebo)\
**Post date:** [March 16, 2018, 5:09am UTC](https://discourse.openrobotics.org/t/launching-urdf-model-in-gazebo-when-i-press-the-run-key-the-model-is-in-chaos-how-to-solve-the-problem/48723/4 "2018-03-16T05:09:13Z")

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/neuoid transmission\_interface/SimpleTransmission PositionJointInterface PositionJointInterface 1 Thank you for your reply. Above is a part of the URDF file. When I press the "run" key in Gazebo, the coordinate of each joint comes together. So every link is in chaos. Thanks.