During export, the common tolerances can be calculated for marked dimensions without a tolerance specified. In this area you can view the standard definitions and create your own definitions.

There are two different definition types “Table-based” and “Precision-based”. The first depends on the value of the test dimension and the second depends on the specified precision of the dimension.

A definition consists of two elements of the superordinate “class” and the associated “tolerance groups”. Ideally, groups are created for all dimension classes (lengths, angles, chamfers) and assigned to a class.

You can create or edit your own definitions for common tolerances. The standard definitions can not be edited.

Tolerance classes combine several tolerance groups into a common tolerance. Use the buttons displayed next to the list of tolerance classes (top) to create new classes or edit or delete existing classes. In the “Edit Tolerance Class” dialog you can specify the display name.

You can assign one or more tolerance groups to a tolerance class or delete an assignment using the buttons displayed next to the list of tolerance classes (bottom). Ideally, groups are created for all dimension classes (lengths, angles, chamfers) and assigned to a class. The groups assigned to a tolerance are displayed to the right of the list of tolerance classes.

Tolerance groups define the actual deviations for a dimension class (lengths, angles, chamfers). There are two types of groups “Table-based” and “ Precision-based”. The first depends on the value of the test dimension and the second depends on the specified precision of the dimension.

In the “Edit Group” dialog you can define the following properties:

• Name: Name of the tolerance group
• Dimension class: Dimension class of the tolerance group (lengths, angles, chamfers)
• Unit: Unit on which the definition is based.
• Definition type: Table or precision-based

The list displayed in the dialog shows the dimensions defined for the tolerance group. For “Table-based” groups, this shows the Min. value, Max. value and the deviation, for “precision-based” groups the precision and the deviation.

The content refers to version 3.3