Izzy! That works perfectly! I figured out how to do it in mere seconds! You take a circle and a cube and position the cube on the edge of the circle. You then parent the cube to the circle so it...

That helps. I've never used lattices before, so I guess I'll dive into that.

About SDK's. I just couldn't get it to work quick. I fiddled around a bit, but no results. I'll have to take some time...

Here are the expressions used for the gears for those who care to know.....

(odd numbered gears)
Expression for gear2 - gear2.rotateX = -gear1.rotateX;
Expression for gear4 - gear4.rotateX =...

Well, I was having too much trouble with set driven keys, so I chose a different path. I have decided to not use dynamics at all since they are turning out to be quite unreliable as far as animating...

I used a hinge constraint, which allowed them to rotate properly, but they flew away from the constraint sometimes for no reason at all, which should not have happened.

The set driven kay would probably be the best thing. I had forgotten about that. I actually did figure out how to set keys for the passive rigid body and everything worked. The only problem was that...

I'm trying to animate a simple gear scene with dynamics, but can't get it to work. I have four gears all the same size and want them to rotate. I was thinking I could make three of them active rigid...