True Position (Coaxiality) reports how closely the axes of two features coincide.
To create a GD&T True Position (Coaxiality) item:
- Open a Geometric group in the inspection sequence.
- Click Geometry tab > GD&T panel > Location > Coaxiality.
- Enter a Name for the item.
- To exclude this item from the report, deselect the Output in report check box.
- To restrict the available datums to items that are close to coaxial with the feature you want to inspect, select the
Use angular tolerance to filter the available features check box, and enter the maximum angle by which the datum items can vary from the axis of the feature in the
Angular tolerance box.
To show all datum items in the list, deselect the Use angular tolerance to filter the available features check box.
- Enter any extra information about the item in the Comment box.
- Click Next. The Coaxiality Definition dialog is displayed.
- In the
Feature list, select the item whose coaxiality you want to report. You can select a line or the axis of a feature, such as a cylinder.
If you select a circle or a cylinder, select a material condition modifier to specify whether you want to take account of the tolerances of the item.
- In the
Datum list, select the line or axis to which you want to compare the coaxiality of the
Feature. Click
to
select an item from the CAD view using the mouse.
- Enter the width of the item's tolerance zone in the
Tolerance box. The control frame at the top of the dialog summarizes the tolerancing requirements.
This GD&T item is length-dependent. The whole Feature must lie within the tolerance zone to be in tolerance.
- Click
Next. The results of the GD&T calculation are displayed in the
Result Preview dialog. If the result is:
- Accepted, the measurement is in-tolerance.
- Out of Tolerance, the measurement is out-of-tolerance.
- Not Calculated, the measurement cannot be calculated because one or more of the selected features or datums is unmeasured.
- Click Finish to create the item and save the results, or click Back to change the item definition.