## Creating an Iterative Alignment

Iterative Alignment dialog box

In automotive terms, an Iterative Alignment will give "body" coordinates. | When the Iterative button is selected from the Alignment Utilities dialog box (Insert | Alignment | New) , PC-DMIS will display the Iterative Alignment dialog box. This dialog box provides a way for you to three dimensionally "best fit " the measured data to the nominal points (or surfaces, if available). This technique requires at least three features to be measured. Certain feature types, such as points and lines, have poor three dimensional locations. If one of these types of features is selected, additional features are needed to provide accurate measured data.

- The first set of features establishes the orientation of the normal axis of the current working plane by fitting a plane through the feature centroids. At least three features must be used in this section (LEVEL - 3 +).

- The next set of features rotates the defined axis of the work plane to the features, fitting a line through the features. At least two features need to be used in this section (ROTATE - 2 + ).
  If no features have been marked, the alignment will use features from the LEVEL section. (The two features used from the LEVEL section are the second and third from last feature.)

- The last set of features translates the part origin to a specific location (SET ORIGIN - 1 ).
  If no features have been marked, the alignment will use the last feature from the LEVEL section.

More:

Understanding Iterative Alignments

To Create an Iterative Alignment

Description of the Iterative Alignment Dialog Box