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PROBLEM SOLVED

Actually, The target value from the tutorial

pose_target = geometry_msgs.msg.Pose()
pose_target.orientation.w = 1.0
pose_target.position.x = 0.7
pose_target.position.y = -0.05
pose_target.position.z = 1.1
group.set_pose_target(pose_target)

was not reachable for COB 3 from its current position, SO when I tried with little change in position as bellow. It got the plan and works

    oldPose = group.get_current_pose().pose
    print "OLD POSE: ", oldPose

    ##shaon end
    print "============ Generating plan 1"
    pose_target = geometry_msgs.msg.Pose()
    pose_target.orientation = oldPose.orientation
    pose_target.position.x = oldPose.position.x
    pose_target.position.y = oldPose.position.y + 0.04 
    pose_target.position.z = oldPose.position.z 
    group.set_pose_target(pose_target)

Thanks

Shaon