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Mates have no effect on COSMOS. They only restrain the assembly on the assembly level, not in the analysis level. You will also have to define contact between the parts.
Pin connectors and other restraints are for analysis purpose. I dont think it would affect the assembly anyway.
But, depending upon the objective of the analysis you have to define the constraints in CAD model.
thanks for the reply,
yes, mates are not used in analysis. may be my assembly overdefined due to some other reason. i will find out the real cause.
by the way,
thanks again for the help...........