[Dan Zollman]

In Studio, choose Animate Component.

Choose the part you want to rotate, then put in your start time and length of time for animation (or, your start and end times).

Then there's another button (I don't remember what it looks like, and I can't open Inventor right now, but it's near the middle of the Animate Component dialog box) to define how the part moves. The symbol with three axes will appear in front of the part. Choose the axis that you want the part to rotate around, and then you should be able to specify the number of degrees or rotations through which you want the part to move. (More than 360 degrees will make it rotate multiple times.)

The second tab in the dialog box gives you the option to have the rotation accelerate at the beginning and end of the time period, instead of having the part immediately start and stop rotation.

If you want the entire assembly to rotate, you could also animate the camera (move it from one place to another) instead of animating the part. Consider whether you want the lighting to be stationary relative to the camera, or relative to the part.

If my instructions are too vague, if you go into the Help section for Studio: under the topic for animating components, there's a tutorial for animating an arbor press. That tutorial has instructions for making a part rotate, and you can just apply the same idea to your own animation.

I hope that works.