You can round off all dimension values except tolerances. For example, if you specify a round-off value of 0.25, all distances are rounded to the nearest 0.25 unit. The number of digits displayed after the decimal point depends on the precision set for primary and alternate units and lateral tolerance values. The following illustration provides rounding examples.

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You can suppress the display of leading and trailing zeros in dimension units. You can also suppress the display of feet and inches when their values are zero. Zero Suppression options are provided on the Primary Units, Alternate Units, and Tolerances tabs of the New, Modify, or Override Dimension Style dialog boxes.

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Tolerances show the range within which a dimension can vary. You can add tolerances as dimension text, using the options on the Tolerances tab to format them. These tolerances differ from geometric tolerances, which are displayed in feature control frames. For information about geometric tolerances, see “Adding Geometric Tolerances.”

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Alternate dimension units communicate the dimension in an additional measurement system. They commonly display the metric equivalent for imperial dimensions, or the imperial version for metric dimensions. Alternate dimension units are displayed in square brackets [ ] next to the primary units in the dimension text. You use the Alternate Units tab in the New Dimension Style dialog box to format alternate dimension units.

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AutoCAD provides many ways to format dimension units. You can set the unit type, precision, fraction format, and decimal format. You can also add prefixes and suffixes. For example, you can add a diameter symbol as a prefix to a measurement or add a unit abbreviation, such as mm, as a suffix. You set the format for primary dimension units on the Primary Units tab in the New Dimension Style dialog box.
Under Linear Dimensions, you can set the format for linear, aligned, radius, diameter, ordinate, and nonangular baseline and continued dimensions. Continue reading →