Translations:Assembly3 Workbench/33/en

Constraints
The designer uses constraints to achieve the desired result for the relation of two parts. The art is the selection of the right constraints best suited to deal with each problem. Each eliminated DOF should in theory only be eliminated once between two objects, but in practice with many CAD tools selected constraints cause over-constrained combinations, often compensated by complex algorithms, sometimes not. Assembly3 does use algorithms to detect and compensate over-constraints, but clearly they are not very matured yet. So in practice for Assembly3 constraints avoid trouble by being aware of how many degrees of freedom (DOF) have been used and which ones are still to be locked down by constraints. No part should have a connection by constraints using more than 6 DOF.