Excluding undercuts from clamp force calculation
If a model contains undercuts or slides, the projected area calculation of the clamp force may be over-predicted.
The analysis log will show a double projection of surfaces to the parting plane for these regions. This over-prediction causes the clamp force calculation to be overestimated.
Select the undercut elements.
Right-click any of the selected undercut elements and click Properties.
The Part surface dialog appears.
Select the Exclude from clamp force calculation check box.
Click OK.