How it revolve a object under my control?

I've created a revolute joint , but I don't like the revolving object affected by gravity or other external forces, or by its own inertia when the other object of the joint starts to move. I need it revolve to certain degree ONLY when I told it.

How this can be achieved?

Thanks in advance!

by looking into the physx docs!

However, certain special effects can require that some dynamic actors not be influenced by gravity. To do this you can call NxActor::raiseBodyFlag(NX_BF_DISABLE_GRAVITY).

I state my problem another way:

How to create a joint in which two actor "tightly" connected with each other, but I can control one actor to rotate to change its direction while the the other one remain its orientation ?