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GOAL_TOLERANCE_VIOLATED ros trajectory control

i have an in house parallel delta robot im controller with the joint_trajectory_controller.

I wrote an action client with a action done callback registered to know when the trajectory has terminated. Unfortunately, every trajectory i execute is returning error_code: -5 (GOAL_TOLERANCE_VIOLATED),

To be sure, i tried setting the goal tolerances for the action AND the joints to a exteremely high number (5000000.0), thinking that there is no way it would fail.. but it does, each time.

What can possibly be the cause of this ?