Telescope joint?

Hello,

I am developing a Kind of robot Simulation app. Different robot arms and parts can be simulated.

I have already added hinge Joints for rotation axis, and use a child Hierarchie to have a Translation axis, both work great.

Now I have a Kind of a "Telescope". Two barres / rods, one is thinner and stuck in the other one, so they can get longer and Shorter but cannot Change their orientation / angle to the other one.

Can this be done using a hinge Joint with a spring?

Or is there a better way?

Thanks a lot

 

You would be better of using Configurable Joints

 

Yes, and Freeze some motions. Looks very promising, Thanks