[ros-users] roll in PR2 end effector
Gokul Subramanian
gokul2411s at gmail.com
Mon Apr 26 21:24:32 UTC 2010
Dear all,
I am writing a program for the SBPL arm planner. In this regard, I had a
conceptual doubt regarding the roll of the end effector (as computed by the
forward kinematics solver).
If I start with a roll of 0.5 radians, and add a roll of -0.5 radians, I am
supposed to end up at '0' right?? But when I change the roll by the
indicated amount, the forward kinematics solver does not indicate a
resultant roll of 0.
I am assuming that the wrist roll is about the end effector length axis. And
any change in wrist pitch (or change in forearm roll angle) is completely
decoupled with a change in wrist roll.
Please let me know where I could possibly be going wrong.
Thanks
Gokul.
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