@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