Siemens NX – Create, Edit, Delete Perimeter Dimension

For sketches, Perimeter dimension can be used to constraint total length of selected lines and/or arcs.

Note: Perimeter constrained dimension can not be created for Ellipses, Conics or Splines.

NX – Create Perimeter Dimension

In a active sketch

Home tab > Rapid Dimension drop down > Perimeter Dimension or

Menu > Insert > Sketch Constraint > Dimension > PerimeterSiemens NX CAD – Sketching Tips – Perimeter Dimension Dialog

Select the required curves (lines/arcs) to create perimeter dimension.

Note that, Perimeter dimension will not be displayed in the graphics window but it will created as a expression. Go the expressions (Ctrl+E), notice the generated expression. It will look like “perimeter_p01” as shown.

If you try to create perimeter dimension for the curves for which it is already created then NX will show error dialog with the message that constraint already exists.



NX – Edit Perimeter Dimension

You can edit perimeter dimension value in the following ways.

  • Go to expression (Ctrl+E or Menu > Tools > Expression) and edit the value of perimeter expression.
  • When sketch is inactive, From part navigator select sketch > RMB > Edit Parameters. In ‘Edit Sketch Dimensions’ dialog, select the perimeter dimension and edit it’s value.
  • Edit Sketch, From part navigator select sketch > RMB > Edit Parameters. In ‘Sketch Parameters’ dialog, select the perimeter dimension and edit it’s value.



NX – Delete Perimeter Dimension

Perimeter expression can not be deleted directly from expressions dialog.

To delete it, Edit the sketch and from part navigator select sketch > RMB > Edit Parameters. In ‘Sketch Parameters’ dialog, select the perimeter dimension and click on delete icon.

Note: If one or more curves are deleted that are used to create perimeter dimension then the perimeter dimension is also deleted.

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