Hi all,

I’m not getting the constraint of a rod on a door with v-arm correctly. See below an image of a real door closer with the corresponding real-life proportions.

To easen the complexity, I’ve tried to make a scheme with three cylinders, where two cylinders move on two individual circumference directions.

- The main cylinder to activate the movement is Cylinder.010.
- When this cylinder is turned, Cylinder.009 begins moving according to circle circumference Circle.005.
- Cylinder.009 in turn “pushes” then Cylinder.008, which in turn moves according to the circle circumference Circle.004.

In the screenshot you can see the parenting and constraint information.

I used *limit location* (to keep object always on z axis) and *limit distance* constraints (to keep the same distance of the cylinders to the circles‘ origins).

Cylinder 8 and 9 should always have the same distance. When I begin moving Cylinder.010, all begins good and Cylinder.009 moves along its circle circumference. The same applies to CYlinder.008. Strangely (or for some of you obviously ), at a certain point, the distance between them gets shorter (red arrow).

Thanks for your expert advice!

Dan