Spinning objects on spinning objects

Hi, im trying to get the highlighted object to spin on the Z whilst the boom its connected to spins on the Y. have tried a bunch of things but am looking for advise.

thank you

To connect objects and make them collaborate Bongo uses hierarchical relationships. When an object is made child of another it is undergoing the same transformations like its parent.
The child not only follows its parent, it can also perform actions of its own, whereas it will act relative to its parents.

This technique is treated in the first minute of the tutorial-video http://bongo.rhino3d.com/video/whys-of-ik.

And here is a sample model :ParentChild.3dm (54.2 KB)


Thank you so much!!

My pleasure.