How to 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.

Create Perimeter Dimension

In a active sketch

Home tab > Rapid Dimension drop down > Perimeter Dimension or

Menu > Insert > Sketch Constraint > Dimension > Perimeter

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

Siemens NX - Perimeter Dimension Dialog
Siemens NX – Perimeter Dimension Dialog

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.

Siemens NX Sketch - Perimeter Dimension Expression
Siemens NX Sketch – Perimeter Dimension Expression

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.

Siemens NX Sketch - Perimeter Dimension Error
Siemens NX Sketch – Perimeter Dimension Error

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.
Siemens NX Sketch - Edit Perimeter Dimension
Siemens NX Sketch – Edit Perimeter Dimension

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.

Siemens NX Sketch - Delete Perimeter Dimension
Siemens NX Sketch – Delete Perimeter Dimension
Siemens NX Sketch - Delete Perimeter Dimension

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