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Hey flyingRobot78,
Could you please ask future MoveIt! related questions on the moveit-users mailing list: moveit-users@googlegroups.com. Its easier for us to track MoveIt! specific questions there.
Regarding your question:
(1) Could you please mention which robot you are doing this with - you mention first roll joint but without knowing the robot its hard to put this in context.
(2) If you are trying to move only one joint of a robot, the right way to do this (if you want to do it with planning) is to have a group just consisting of that one joint and move it directly. The way you are doing it seems overly complicated for a 1 DOF motion.
(3) when you specify path constraints, you need to specify a "planning volume" by setting the workspace bounds in the motion plan request: workspace_parameters.min_corner and workspace_parameters.max_corner.