Creating a GDT Perpendicularity Call-out in CAM2

Preparation

• Create the datum features as detailed in the following articles:
  • Applying Datums to Features in CAM2
  • Creating Composite Datums in CAM2
• Measure the features that require the GDT call-out

Creating the GDT Call-out

• Select the GDT tab
• Highlight the required feature in the Feature panel
• From the ribbon select  Perpendicularity

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:
  1. Click into the tolerance, and enter the required value
  2. Select the required datum
     

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

Perpendicularity measures the condition of a plane or axis, at a right angle (90 degrees) to a datum plane or axis.

A tolerance zone is applied, that is exactly 90° to the datum feature. The measured surface or axis of the feature, across its full length, must remain within this zone to be deemed as acceptable.

Note: When measuring the feature to be checked, the length of the feature is critical to this calculation. Therefore the full length of the feature must be measured.

This on a drawing...	Means this when calculated...