Model-Based Definition > Model-Based Definition > Working with Legacy Datums > Converting Legacy Datums
  
Converting Legacy Datums
Use the Legacy Datum Annotations Conversion tool to convert legacy datums to datum feature symbol annotations.
To convert legacy datums, follow the steps below:
1. Set the configuration option combined_state_type to mbd or semi_mbd. See About the Visibility of the Combined State.
2. Right-click an annotation on the Detail Tree and click Convert All.
3. Click Annotate > Annotations > Legacy Datum Annotations Conversion. The Legacy Datum Annotations Conversion dialog box opens.
 
If you are working in Drawing mode, you must click Legacy Datum Annotations Conversion from the model.
If you are working in Assembly mode, you must click Legacy Datum Annotations Conversion from the top model.
If there are any annotations assigned from an inheritance feature, you must click Legacy Datum Annotations Conversion from the source model.
4. Click Convert All Set Datums to convert all the legacy set datums to set datum tag annotations. The results of the conversion appear in the Set Datums and Datum Annotations Table.
If the conversion is successful, the datum is removed from the Set Datums column and is listed in the Annotations column. There is nothing in the Status column.
If there is a conflict, the datum is removed from the Set Datums column and is listed in the Annotations column. In the Status column, appears and in the Required Actions column, Change Reference appears. For more information about the status, place the pointer on .
If there is a failure, the datum remains in the Set Datums column. In the Status column, appears and in the Required Actions column, Create DFS appears. For more information about the status, place the pointer on .
5. Resolve the conversion conflicts. These are identified by the required action, Change Reference.
Click Change Reference and select a reference on the model. The legacy set datum tag annotation converts to a datum feature symbol annotation. Repeat this step for all conflicts.
6. Resolve the conversion failures. These are identified by the required action, Create DFS.
a. Review Resolving the Set Datum Conversion Failures to see if there is a scenario and issue that matches the failure. If there is a match, implement the workaround for the failure. Repeat this step for all the failures with a workaround and then click Convert All Set Datums to convert the legacy set datums to set datum tag annotations.
b. If no workaround is available for the failure, click Create DFS to create a new datum feature symbol annotation with the same name as the set datum. The datum feature symbol annotation appears in green. Repeat this step for all failures that do not have a workaround.
7. Click Convert All to DFS to convert all the remaining legacy set datum tag annotations to modern datum feature symbol annotations. All the datum feature symbol annotations appear in green.
8. (Optional) Click Save Results to save the current state of Set Datums and Datum Annotations Table to an information file. By default, the .inf file is saved in the working directory.
 
* If you start work in a drawing, and then open the part and perform the conversion, you must return to the drawing and update all sheets. Follow the steps below:
1. Right-click a sheet and click Select All.
2. Click Review > Update > Update Sheets to update all the drawing sheets.
3. Click the Show Model Annotations command to display the newly created datum feature symbol annotations.
* For a drawing, the erased or unerased state of the converted datums and annotations remains unchanged.
Resolving the Set Datum Conversion Failures
When the Legacy Datum Annotations Conversion tool cannot convert a legacy set datum, Create DFS appears. The following table describes the scenarios and the workarounds to resolve these conflicts:
Scenario and Issue
Workaround
A set datum is placed on a datum axis, which is normal to the current orientation plane.
1. Click Annotate > Annotation Planes.
2. Select a plane that is parallel to the datum axis. The datum axis becomes parallel to the current orientation plane.
A set datum is placed on a datum axis, which is placed at an angle to the current orientation plane.
1. Create a datum plane that is passing through the datum axis.
2. Click Annotate > Annotation Planes and select the newly created datum plane.
3. Click Active Annotation Plane. The datum axis becomes parallel to the current orientation plane.
A model set datum is placed on a model GTOL. The GTOL was created in Drawing mode with the As Free Note placement type.
Since the GTOL was created as a free note in Drawing mode, it does not have any reference in the model. It is treated as a draft GTOL in Part mode and fails to convert.
1. On the Drawing Tree or the Model Tree, select the draft GTOL and click on the mini toolbar.
2. Select a reference on the model. The GTOL becomes a standard model GTOL.
A model set datum is placed on a model GTOL. The GTOL was placed on a model dimension in Drawing mode with the Dimension Elbow placement type and Edge reference.
Since the GTOL was created with an edge reference in Drawing mode, it does not have any reference in the model. It is treated as a draft GTOL in Part mode and fails to convert.
1. On the Model Tree, select the draft GTOL and click on the mini toolbar.
2. Select an edge on the model as a temporary reference. The GTOL is placed on the selected edge.
3. Select the GTOL and click on the mini toolbar.
4. Select the dimension on which the GTOL was placed. The GTOL becomes a standard model GTOL.
5. Right-click the GTOL and select the Dimension Elbow check box. The GTOL is placed on the dimension elbow.
A model set datum is placed on a model GTOL. The GTOL was placed on a model leader note in Drawing mode with the Note Elbow placement type.
Since the GTOL was created with on a model leader note in Drawing mode, it does not have any reference in the model. It is treated as a draft GTOL in Part mode and fails to convert.
1. On the Model Tree, select the draft GTOL and click on the mini toolbar.
2. Select the same leader note as a reference on the model. The GTOL becomes a standard model GTOL.