How to apply a GDT surface profile call-out to a feature.
- Alignment to a CAD model is required.
- Surface Profile can be applied to:
- Point Cloud
- Inspect Surface
- 3D Geometrical features (planes, cylinders, cones, spheres etc.)
Creating the GDT Call-out
- Select the GDT tab
- Highlight the required feature in the Feature panel
- From the ribbon select Profile of a Surface
The GDT panel will open in the lower LH corner of the UI
Note: If the GDT icon is ‘greyed-out’ this details that the selected feature does not support this call-out.
- Within the GDT panel:
- Click into the tolerance, and enter the required value
- Select the required datum
Note: Partial datum frames for Surface Profile are not supported.
By default, the Surface Profile tolerance is equally applied to either side of the CAD surface. To apply an Unequally Disposed Surface Profile tolerance:
- Right click in the cell to the right of the tolerance
- Select Unequally Disposed Tolerance
- Enter the +ve tolerance to the right of , the remaining will be applied to the -ve side of the surface.
The call-out will be calculated and the result will be shown in the GDT label displayed in the 3D viewer.
Note: To display results in the GDT label select via View > GDT Label > Level of Detail
Copying GDT Call-outs to Other features
This allows multiple features of the same type to have the same call-out applied
- Apply the call-out to the first feature
- Highlight the first feature
- Right click and select Copy Tolerances
- Multi-select other features
- Right click and select Paste Tolerances
- Message ‘Do you also want to paste the GDT tolerances?’, select Yes
The GDT call-out will be applied to the selected features, and the GDT label will be displayed.
How it’s Calculated
Profile of a surface controls 3-Dimensional deviation relative to a surface or group of surfaces. Surfaces are commonly of a freeform condition. The tolerance zone directly mimics the nominal profile, and can be equally or unequally distributed on either side of the nominal profile
When applied to a surface, the entire measured surface must fall within the tolerance zone, therefore all points on the surface must remain within this zone to be deemed as acceptable.
|This on a drawing...||Means this when calculated...|