HEIDENHAIN ND 1300 OED and Crosshair Systems - Manual (Page 150)

132 QC-300 Series User’s Guide
True position
True position tolerances can be applied to points, lines, circles and arcs.
Points and lines
The tolerance screens for points and lines are identical, and are used
to specify the acceptable deviation from the nominal feature position.
The true position tolerance compares the measured location of the
center point to the nominal center point.
Enter the nominal values into the X and Y axis data fields. Enter the
allowed tolerance diameter into the Tol Dia field.
Circles and arcs
The tolerance screens for circles and arcs are identical, and are used to specify the acceptable deviation
from the nominal feature position, and from the nominal diameter. The true position tolerance compares
the measured location of the center point of the circle or arc to the nominal center point and compares the
measured diameter to the nominal diameter. Touch the D (diameter) or r (radius) choice field in the DRO
screen to toggle between the display of diameter and radius if desired.
Enter the nominal values into
the X and Y axis and D (diam-
eter) data fields provided. Enter
the allowed Tol Dia (Tolerance
diameter) and feature diameter
limits into the Limit data fields
as +/- ranges or as absolute lim-
its. Touch the Limit data fields
to toggle between +/- ranges or
absolute limits.