Linear dimension measures the distance between the centroid of a plane, line, or axis normal to a datum plane or axis. Use the GD&T Linear Dimension item to determine how closely the distance between a feature and a parallel datum match the nominal.
Note: Linear dimension is not a true GD&T measure, but it can be used to calculate the relative positions of features.
To create a GD&T Linear Dimension item:
- Open a Geometric group in the inspection sequence.
- Click Geometry tab > GD&T panel > Location > Linear Dimension. The Item Definition dialog is displayed.
- Enter a Name for the item.
- To restrict the available datums to items that are close to parallel 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 parallel 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.
- In the Feature list, select the plane, line, or axis of an item from whose centroid you want to measure the distance.
- In the Datum list, select the datum to which you want to measure the distance.
- In the Nominal box, type the nominal distance between the Feature and Datum.
- Enter the Low tolerance and High tolerance for the measurement.
- 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.