Class fit dimensions

Because the tolerance specification for the proper fit between holes and shafts is such a common and critical aspect in the design and manufacture of parts, international standards bodies have established rule-based systems of tolerances for the Limits and Fits of holes and shafts.

The terms hole and shaft can also be taken as referring to the space between two parallel faces of any part, such as the width of a slot, the thickness of a key, etc. Only distance dimensions are covered by the standards. The standards do not apply to angular dimensions.

Solid Edge provides ASCII text files that you can use to automatically define the limit or fit for a dimension whose type is set to Class using the dimension command bar.

Class dimension display options

When you set the dimension display type to Class, you can choose one of several methods to display the limits or fits for the dimension.

Fit

Fit, tolerance only

Fit with tolerance

Fit with limits

Fit Hole/Shaft only

Fit Hole/Shaft, tolerance only

Fit Hole/Shaft with tolerance

User-defined

(Any user-defined text is valid)

Formatting options for class fit dimensions

You can specify formatting options for tolerance dimensions and for class fit dimensions by editing the dimension properties or by defining it in the dimension style. Refer to the following options on the Text tab, in the Tolerance Text group:

Hole/Shaft

Three separator types are available to specify the layout of class fit hole/shaft dimensions with tolerance.

Use these options

To get this layout

Separator

Vertical

Space

Vertical

Slash

Horizontal

Position

Use these options

To get this layout

Bottom

Tolerance aligned to the bottom of the dimension text.

Center

Tolerance center-aligned with the dimension text.

Top

Tolerance aligned to the top of the dimension text.

Align to

The following options are available to specify alignment of the upper tolerance value with the lower tolerance value:

  • Decimal Point

  • Sign

Use tolerance text size for combined tolerance text values

When upper and lower tolerance values are the same, specifies that the combined values are displayed using the tolerance text size entered in the Size box.

Example:

Class fit ASCII text files

Three ASCII text files are available that provide support for ANSI and ISO class fit dimension standards:

By default, the files are located in the Solid Edge Program folder. You can instruct Solid Edge to look for these files in a different folder, including a folder on another machine on the network using the File Locations tab on the Options dialog box.

Note:

If you edit these files, save a copy of these files before you uninstall Solid Edge.

Controlling the display of zero value tolerances

When placing a class fit dimension that displays a tolerance, you can set an option to inhibit the display of a tolerance that has a value of zero.

The Inhibit Display of 0.0 Values for Automatic Fit Tolerances option on the Text page controls whether zero value tolerances are displayed or hidden.

You can set this option for an individual dimension using the Properties command, or you can set it for all dimensions using the Style command.

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