For example, you might want to create a 'centered' relation that would keep a body centered between two faces on another solid. In addition to just moving and positioning these bodies, you can build 'relations' that keep the design intent intact. Just like Solidworks, Catia, NX, and all the other 'big boy' CAD packages, TopSolid lets you work with, and create, assemblies. TopSolid has a full assembly modeling environment. However, for any serious modeling needs, you'll often hear the Resellers pushing you to buy a copy of Solidworks. For simple jobs, the tools are there to let you get the job done. But the tools in Mastercam don't go far enough to let you build a true assembly. Yes, there are some new tools for dealing with solid models from other software packages. There are some new tools that were finally introduced in X9 to position or make copies of Solid bodies, but there are no real tools to maintain your assembly model. Mastercam doesn't have full assembly modeling. Reason #14 of 15 - Full Assembly Modeling

Hsmworks vs mastercam