Using the Tolerance Policy Editor
You use the Tolerance Policy Editor to enter tolerance and roughness values for all GCDs in a component. You also use it to control the import of PMI attributes from the CAD model (see the next section).
To open the Tolerance Policy Editor
1 There are two ways to open the Tolerance Policy Editor:
• From the middle tab of the Cost Guide, or
• From the Edit menu in the Manufacturing Process panel.
2 The Tolerance Policy Editor provides the following features:
• A: A set of fields for manually entering tolerance and roughness values that should be applied by default to GCDs in the component.
• B: Radio buttons and checkboxes for controlling tolerance and roughness behavior, including whether or not to import PMI values directly from the CAD file.
• C: A reference panel showing common drafting symbols for supported tolerance and roughness specifications.
The tolerance mode controls include:
• Assume tolerance and roughness achieved by the manufacturing operation selected for that GCD is sufficient — This is the default tolerance policy. If you do not manually enter tolerance or roughness requirements for any GCDs, and do not import PMI attributes from the CAD model, the GCD tolerance and roughness requirements are set to unspecified and aPriori evaluates routings assuming that the processes have sufficient tolerance capabilities to manufacture the GCD. That is, aPriori does not determine that a process or operation is infeasible or check secondary machining operations based on achievable tolerance and roughness requirements. If you do specify or import tolerance or roughness requirements for a GCD, tolerance and roughness capabilities are evaluated during routing and operation sequence selection.
For more information on explicitly setting tolerance and roughness values for a GCD, see Editing values in the GCD properties table and GCD commands.
• Use the following values — Select this option to enter the default tolerance and surface roughness for the part. These values are used for each GCD that does not have values manually set at the GCD level.
• Use CAD model values —Select this option if you want aPriori to use the tolerance and roughness specified by semantic PMI attributes in the CAD model (currently supported for Creo, CATIA, and NX).
• Replace CAD tolerance values less than: -- If the CAD model has overly tight tolerance values (which sometimes occurs if tolerance defaults are set by CAD PMI imports), check the box, enter a limit for the overly tight tolerance values, and enter a replacement value.
Use current settings as my default… -- Check this box if you have changed tolerance policy settings and want these settings to be the default settings for all future (new) cost components.
To edit the tolerance policy for a component
1 Open the Tolerance Policy Editor as described in the previous procedure.
2 Click the Use the following values: radio button and enter values for the tolerance and/or roughness settings you wish to control.
Refer to the table in How tolerances map to GCDs for information about specific settings.
3 Click OK to apply changes, recalculate the cost, and close the Tolerance Policy Editor.
You can also click Apply to apply changes and recalculate the cost without leaving the Tolerance Policy Editor.