Hello everybody I am bending a pipe by rotating the bending die ( circular instance )  

As you can see in the second picture I have used a kinematic coupling then I applied a velocity angular around z axis.

when it rotates It bends the pipe but around the bending die ( circular instance ) it appears huge constrains.

How can I rotate the bending die easily without creating constrains? the only constrains I want to see, are those created by the bending process, not the velocity.