Any AutoCad users? If so I have a ??? I used UG NX 1.8 and 2.0 mostly but I have to do some work in AutoCad 2005. Basically, I have an 8 bar parallel mechanism and I need to model it at a few points to verify clearances and the like. I'd prefer UG but we can't always do things the easy way now can we. My qusetion is: Is there a way to produce a linked system in autocad where rotating one part of the system casuses appropriate changes on the other parts? Just wondering otherwise I have to seek another piece of software to help me verify my clearances in addition to drafting it in autocad. Thanks for any and all help.