1. Group all parts of the gatling gun and group them in one group. 2. Make a Cylinder and put it where your roataing point is apply a texture that can't be seen or just hide it beneath the geometry. 3. Go to object attributes and make the cylinder the parent of the group then when you want to rotate the group rotate the cylinder not the group. 3. Now you can make the body of the bot the parent of the cylinder so when you move the body everything goes with it. I hope this helps some.

The wit of a misplaced ex-patriot.
I cheated on my metaphysics exam by looking into the soul of the person next to me.