A critical dimension is a specific part dimension, which must meet the defined tolerances. A critical dimension is defined by two points, and can be used in a DOE analysis to study warpage.
Click (Boundary Conditions tab Dimensions panel Critical Dimensions) and select Design of Experiment from the drop-down menu.
In the DOE Critical Dimensions dialog, type the ID of a node that defines one end of the critical dimension. Alternatively, click on the node on your model and the ID will be placed in the Node 1 box automatically.
Repeat the process for the second node.
Type a name in the Name box that is unique to this study.
Click Close to close the dialog.
Click (Finish Boundary Conditions) to close the Boundary Conditions tab.