If launching from Autodesk® Inventor, Pro/Engineer, SolidWorks, or SpaceClaim, the model units for this example are set automatically to mm. No further steps are necessary for length unit assignment.
If launching from the other CAD tools or from the Desktop, change the length units to mm by right clicking on the Geometry branch of the Design Study Bar:
On the Change Units dialog, leave Change Units checked, and click OK:
Note: This dialog does not appear when launching with the Mechanica method from Pro/Engineer.