Worksusr,
You can get the gears to interact with each other using physical dynamics funtionality in SWX 2001 plus. In the assembly mode, select "move part", in the property manager, check "interference detection" and "physical dynamics" now when you grab the gear, it will move the other when it contacts the other.
The thing I want to tell you is that you had better have a sooper-dooper-gigundo vidoe card when you do a gear interaction simulation. Performance is a problem when using Phys Dynamics with gears. and complex objects
Hope this helps
JOn