HEIDENHAIN IK 5494-2D - Manual (Page 235)

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Tolerancing
Parallelism
Parallelism tolerances can be applied to lines and are used to
specify the acceptable deviation from a line perfectly parallel
to a Reference feature. Minimum and Maximum Projected
zone values are added to the feature length to continue the test
of parallelism beyond the line end.
Enter the acceptable parallelism deviation value into the Tol
Zone data field, select a Reference feature from the drop-
down list, add any Projected Zone values and then click OK.
Projected zones are discussed in Appendix C: Tolerances Appendix C: Tolerances.
Perpendicularity
Perpendicularity tolerances can be applied to lines and are
used to specify the acceptable deviation from a line perfectly
perpendicular to a Reference feature. Minimum and Maxi-
mum Projected zone values are added to the feature length to
continue the test of perpendicularity beyond the line end.
Enter the acceptable perpendicularity deviation value into the
Tol Zone data field, select a Reference feature from the drop-
down list, add any Projected Zone values and then click OK.
Projected zones are discussed in Appendix C: Tolerances Appendix C: Tolerances.
Angularity
Angularity tolerances can be applied to angles and are used to
specify the acceptable deviation from a Nominal angle made
between two lines selected in the Features list. The line clos-
est to the top of the list is the reference for the measurement.
Minimum and Maximum Projected zone values are added to
the feature length to continue the test of angularity beyond the
end of the angle.
Enter the acceptable angularity deviation value into the Tol
Zone data field, add any Projected Zone values, enter a nomi-
nal angle and then click OK. Projected zones are discussed
in Appendix C: Tolerances Appendix C: Tolerances.
Tolerance Types