Create Ordinate Dimensions - Autodesk 057B1-41A111-1001 - AutoCAD LT 2010 User Manual

Create Ordinate Dimensions

Ordinate dimensions measure the perpendicular distance from an origin point
called the datum to a feature, such as a hole in a part. These dimensions prevent
escalating errors by maintaining accurate offsets of the features from the
datum.
Ordinate dimensions consist of an X or Y value with a leader line. X-datum
ordinate dimensions measure the distance of a feature from the datum along
the X axis. Y-datum ordinate dimensions measure the distance along the Y
axis.
Locate the Datum
The location and orientation of the current UCS determines the ordinate
values. Before creating ordinate dimensions, you typically set the UCS origin
to coincide with the datum.
408 | Chapter 9 Annotate Drawings