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Hello,

Thanks for your answer. we did discover a new problem, however. After reading a bit more i found the following text:

'The Unified Robot Description Format (URDF) is an XML specification to describe a robot. We attempt to keep this specification as general as possible, but obviously the specification cannot describe all robots. The main limitation at this point is that only tree structures can be represented, ruling out all parallel robots.'

And a Delta Robot is a parallel robot. Now we are wondering on what to do. We could rewrite arm_kinematics and rename it to parallel_kinematics or something like that, but perhaps some of you have other/better ideas than we have :-)