NX A Radial Diametral dimension in NX Drafting has no extension line...

A diametral dimension has no extension line when created on a partial circular cutout.
This behavior is specific to cases where a partial circular cutout is perpendicular to the axis of a shaft.

Solution

In NX Drafting, when creating a diametral dimension on a partial circular cutout (that is perpendicular to the axis of a shaft), it is necessary to select the 'face' of the cutout, rather than the extracted edge (spline), to ensure that an extension line is created.

Notes and References

Hardware/Software Configuration

Platform: INTEL
OS: window
OS Version: 1064
Product: NX
Application: DRAFTING
Version: V1851
Function: DIMENSION

Ref: 001-9393149