@faust07 said: This is the world of MSPhysics … Sorry, but there are a mass of examples for caterpillar. Dear faust07! Yes I know, thats usual a MS Physics topic. However Ms Physics uses motor operated driving rollers to move the chain. This I don't need (like any other physics) . also I am not sure whether animations created by MSPhysics can be combined with Fredo6-Animator. Does anybody know this? rgds DWH