Checking Geometric Tolerances

• Reads and decodes geometric tolerances applied on CAD data,
• Accurately evaluates actual size, position and form of the mesh for each selected tolerance,
• Provides you with an OK/KO status for each tolerance,
• Summarizes the results in a report.

• Only the following tolerances are supported in this release:

  Tolerance Type	Tolerance Name	Applying to
  form	flatness	so called planar surface
  form	cylindricity	so called cylindrical surface
  form	circularity	so called cylindrical or conical surface
  form	straightness	cylinder axis
  orientation	parallelism	surface/reference plane
  orientation	perpendicularity	surface/reference plane
  orientation	angularity	surface/reference plane

• Reference planes are currently computed as mean planes. True reference planes computation based on infinite norm are not yet supported.

The mesh must be properly aligned with the corresponding exact CAD data (by best fit for example).

In order to be properly analyzed, the mesh must be segmented into different areas. An automatic segmentation is provided inside the command, but you can use any other segmentation tool as well (before entering the command):

• If the input is an already segmented mesh, the command takes this segmentation into account. No automatic segmentation is started. This way, you have full control over the segmentation used within the command.
• If input is a non-segmented mesh (a mesh with just one internal cell), the automatic segmentation is started (this segmentation is guided by the aligned exact geometry, hence the requirement of a proper alignment).

Open the GeometricTolerancesChecker01.CATPart from the samples directory.

1. Click Geometric Tolerances Checker in the Check Deviation toolbar.
   The dialog box is displayed.
   

2. Select the Mesh to inspect.
   

3. Select the geometric tolerances you want to check:

   Either pick them directly, or pick the CAD surfaces related to them in the 3D view (In this case, tolerances are deduced from the surfaces.) Multi-selection is available. The supported tolerances are listed with their requested tolerances: Selecting one line in the dialog box highlights the mesh zone computed to extract the primitive used to measure that FTA.

4. Optional: Select the Radius check box: when the cloud of points is noisy, it is difficult to have the boundaries of the CAD surface going through all the points.
   When you select this check box, the points inside a circular pipe centered on the surface edge are not taken into account. You can set the value of this radius.
   This option being useless for already segmented input meshes, it is available for non segmented meshes only (grayed otherwise).

5. Click Apply to start the inspection.

   Each tolerance is evaluated and the measured value is displayed, with an OK/KO status: The tolerances in the 3D view are painted in red or green accordingly.

6. Click OK to validate and exit the command.
   The inspection display is erased from the screen.
   A feature GD&T Check.x is created in the specification tree under the Deviation Check node.
   

7. Either add the GD&T Check.x feature as a More Elements to Export in a Deviation Report:

   Click Deviation Report in the Check Deviation toolbar. Go to the Deviation tab and to More Elements to Export. Click Add and select the GD&T Check.x you have created (you can select several GD&T Check.x features). The exported report looks like this: Each GD&T Check.x  feature has its own section in the Deviation check results web page, and can be accessed directly from the navigation panel.

8. Or capture the image of the GD&T Check.x feature to insert it in the deviation report.

   Double-click the GD&T Check.x  feature to display it. Create the image with the Tools > Images > Capture menu or by any other means. Click Deviation Report in the Check Deviation toolbar. Go to the Insert Images tab and click Add. Select the image to insert. The exported report looks like this: