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For some of my 5dof manipulators, I've run into the same issue.

What worked for me was to wrap the Collada file describing your manipulator in an OpenRAVE robot definition file (that is not official terminology). This provides OpenRAVE IKFast with enough information to be able to generate a plugin for your robot. This also requires passing different parameters to be passed to the openrave.py script (I used version 0.8):

openrave0.8.py --database inversekinematics --robot=/path/to/collada_file_with_manipulator.xml --iktype=translationdirection5d --iktests=100

The iktests parameter value was just a default, you can make it larger or smaller.

Unfortunately I cannot find my collada_file_with_manipulator.xml right now, so I cannot provide it to you, but I used something like:

<robot file="/path/to/converted.urdf.dae">
  <Manipulator name="YOUR_NAME">
    ...
  </Manipulator>
</robot>

Note that you don't need to manually edit the Collada file you got by converting your urdf, you can reference it in your wrapper model definition using the file attribute.

I used the following pages for information:

• OpenRAVE Custom XML Format, in particular the Defining Manipulators section
• Translation3D failed to find a variable to solve

For some of my 5dof manipulators, I've run into the same issue.

What worked for me was to wrap the Collada file describing your manipulator in an OpenRAVE robot definition file (that is not official terminology). This provides OpenRAVE IKFast with enough information to be able to generate a plugin for your robot. This also requires passing different parameters to be passed to the openrave.py script (I used version 0.8):

openrave0.8.py --database inversekinematics --robot=/path/to/collada_file_with_manipulator.xml --iktype=translationdirection5d --iktests=100

The iktests parameter value was just a default, you can make it larger or smaller.

Unfortunately I cannot find my collada_file_with_manipulator.xml right now, so I cannot provide it to you, but I used something like:

<robot file="/path/to/converted.urdf.dae">
  <Manipulator name="YOUR_NAME">
    ...
  </Manipulator>
</robot>

Note that you don't need to manually edit the Collada file you got by converting your urdf, you can reference it in your wrapper model definition using the file attribute.

I used the following pages for information:

• OpenRAVE Custom XML Format, in particular the Defining Manipulators section
• Translation3D failed to find a variable to solve