I am trying to mate a timing belt with two different gears. It works perfectly with one gear but when i mate with the other gear it says one of the pulleys selected is fixed. How can i avoid that? If i don't mate with the other pulley the teeth of belt just passes right through the pulley teeth.
Have you modeled all the teeth on the timing belt? Not the norm in my world. But I digress, you probably need to make the "gears" free to rotate in order to mate how you are trying.