Rotation problem animation (Inventor studio)

[Kermisboy12]

Dear readers of the message,

I want to make a part rotate in the animation, but the problem is that if the part is rotating and it is on half way its turning back.
I tried different things to solve the problem but it would'nt work.

A youtube movie to show the problem:

Link

How I made the animation is simple, the parts are constrained on the way they sould be constrained, the angleconstraints are loaded on the parameters so I can import them to Inventor studio.
In Inventor studio I have made the annimation on the way how the parts have to move.

I have met this problem before, als with 1 rotating piont.
It is frustrating me how to fix this problem, maybe someone can help me?

By the way, I am using Inventor 2011 student version.

Beforehands thanks for helping. 

[pcrawley]

There are 3 types of angle constraint. I suspect you might be using the first option. Try the third type - it will prompt you for 3 selections: Face 1, fase 2, and the axis of rotation. That'll fix it.

[Kermisboy12]

The problem is solved this way, thanks