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Control velocity of joints in Moveit/ROS

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Hey all!, I am trying to use Moveit to control the movements on my real robot. I have setup JointTrajectory Controllers which get the position and velocities from Moveit and relay it to my Arduino which in turn controls 3 steppes. The problems I'm having , is with the velocityof the joints in Moveit. They are a bit high , due to which my steppers cannot keep-up and they eventually lose-sync for complicated trajectories. Is there a way to scale the velocities down? I have tried joint_limits to control the max velocity, but it does not help as it only limits and does not scale or slow down the motion in Moveit. Is there a way to slow down the execution time? I have seen time parameterization...but is there any other way to my problem?

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