Closed wellyowo closed 1 month ago
Since those 3 links you mentioned have no visual parts, they should really have zero mass/inertial properties. The reason those links exist are purely for convenience (either to signify the end of the arm/gripper kinematic chain or to provide a common reference frame for the two paddles on each gripper finger). However, as you discovered, Gazebo doesn't play nice with links in the URDF that have no mass/inertial properties. So the 0.001 you see there is just a dummy value. And no, I don't think it will affect the dynamics of the arm. The mass of each of those 'virtual' links are each 1 gram which I would imagine is negligible compared to the inertial properties of the other robot links.
Question
Hello,
When I run Gazebo with the WX200 simulator, I feel confused about setting up the inertia for three links: ee_arm_link, fingers_link, and ee_gripper_link. All these links have no visual parts and are set with a mass of 0.001 and inertia of 0.001 as well. However, when I look at the inertia visualization in Gazebo, it appears like the picture
I have two questions regarding setting the inertia to 0.001:
Please let me know if this setup won't affect anything, or if there are any considerations I should be aware of. Thank you.
Robot Model
wx200
Operating System
Ubuntu 18.04
ROS Version
ROS 1 Melodic
Additional Info
No response