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Control Dimension Values

May 20, 2011

Set the display format of dimension values.


Dimension Units

      You can determine the appearance and format of the primary and alternate dimension units. The preview frame on the upper right corner of the Modify Dimension Style dialog box shows the appearance of the dimensions based on the current dimension style settings.

     On the Primary Units of the Modify Dimension Style dialog box, you can set the primary units for linear and angular dimensions, including unit format, numeric precision and so on. These settings control the display of dimension values. For linear dimension, you can also specify the prefix or suffix. The specified prefix replaces the prefixes used for diameter and radius dimensions (Ø and R, respectively).

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To round off dimensions

  1. Choose Dimension > Dimension Style.

  2. In the Dimension Style Manager, select the style you wish to change and choose Modify.

  3. Click the Primary Units tab.

  4. In the Linear Dimension field, type or select the nearest value to which you want to round off dimensions.

  5. Click OK.

  6. Choose Close to exit.

Dimension toolbar\

Command line DIMSTYLE

NOTE You can also specify units for linear dimensions using the DIMLUNIT system variable. You can specify fraction formats using the DIMFRAC system variable.


Alternate Units

      You can create a dimension in two systems of measurement simultaneously in a drawing. This feature is helpful when you want to add feet and inches dimensions in a drawing created using metric units. The alternative units appear in a square brackets ([]) in the dimension text. Alternative units can be applied to linear dimensions only.

       If you turn alternative-units dimensioning on when editing a linear dimension, the measurement is multiplied by a specified alternate scale value. This value indicates the number of alternate units per current unit of measurement. The default fault value for imperial units is 25.4, which represents that each inch is equivalent of 25.4 millimeter. The default value for metric units is 0.0394, which represents that each millimeter is equivalent of 0.0394 inch. The precision for alternate units determines the number of decimal places.

       For example, for imperial units, if you specify the default value of 25.4 to the alternate scale setting, and 0.00 to the alternate precision, the dimension is shown as the following figure.

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To create an alternate dimension

  1. Choose Dimension > Dimension Style.

  2. In the Dimension Style Manager, select the style you wish to change and choose Modify.

  3. Click the Alternate Units tab.

  4. Click the Display Alternate Units check box.

  5. Make your selections.

  6. Click OK.

  7. Choose Close to exit.

Dimension toolbar \

Command line DIMSTYLE


Round Off Dimension Values

       Except of angle dimensions, all other dimension values can be rounded off. For example, if you specify a round-off value of 0.75, all distance are rounded to the nearest 0.75 unit. The number of decimal places is determined by the precision set for primary and alternate units and lateral tolerance values.

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Suppress Zeros in Dimensions

       Control how to deal with leading and trailing zero in the numeric portion of dimension text. If you suppress leading zero in decimal dimensions, 0.700 becomes .700; if you suppress trailing zero, 0.7000 becomes 0.7. If you suppress both leading and trailing zeros, 0.7000 becomes .7 and 0.0000 becomes 0.

      The following paragraph shows the effect of selecting zero feet and zero inches using architectural units style. If feet are included with a fractional inch, the number of inches is always indicated as zero and ignores any option you select. So, the dimension 4'-3/4" becomes 4'-0 3/4".

 

Option Effect Examples
No options selected Includes zero feet and zero inches 0'-0 1/2" 0'-6" 1'-0" 1'-0 3/4"
0 Inches selected Suppresses zero inches (includes zero feet) 0'-0 1/2" 0'-6" 1' 1'-0 3/4"
0 Feet selected Suppresses zero feet (includes zero inches) 1/2" 6" 1'-0" 1'-0 3/4"
0 Feet and 0 Inches selected Suppresses zero feet and zero inches 1/2" 6" 1' 1'-0 3/4"


Display Lateral Tolerances

      Lateral tolerance represents a value that the amount a measured distance can vary. You can control the degree of accuracy needed for a future by specifying tolerances in manufacturing. A feature is some aspect of a part, such as a line, axis, point, or surface.

      You can append tolerances to the dimension text directly. These dimension tolerances indicate the largest and smallest permissible size. You can also apply geometric tolerances to indicate deviations of form, profile, location, orientation, and runout.

      You can specify exact measurements to lateral tolerances theoretically. They are called basic dimensions and have a box drawn around them.

        Deviation tolerances represent with the plus and minus values that are appended to the dimension values. If the deviation tolerances are equal, the ± signs precede them and they are known as symmetrical. Otherwise, the plus value locates above the minus value. Shown as the following figures.

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       If you create a limit tolerance, the system displays a maximum and minimum value. These values replace the original dimension values. The upper limit locates above the lower if you specify limits.

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       The vertical placement of tolerance values that is relative to the main dimension text can be specified. For example, you can align the tolerances with the top, middle, or bottom of the dimension text.

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        You can also control how to suppress zero for tolerance values, as you can with the primary and alternate units. The effect of suppressing zero in lateral tolerance is the same as suppressing zero in the primary and alternate units.


Commands Reference

DIMSTYLE: Creates and modifies dimension styles

System Variables Reference

DIMALT: Controls the display of alternate units in dimensions

DIMALTD: Controls the number of decimal places in alternate units

DIMALTF: Controls the multiplier for alternate units

DIMALTTD: Sets the number of decimal places for the tolerance values in the alternate units of adimension

DIMALTU: Sets the units format for alternate units of all dimension style family members except angular

DIMALTZ: Controls the suppression of zeros for alternate unit dimension values

DIMAPOST: Specifies a text prefix or suffix (or both) to the alternate dimension measurement for all types of dimensions except angular

DIMAUNIT: Sets the units format for angular dimensions

DIMDEC: Specifies a text prefix or suffix (or both) to the alternate dimension measurement for all types of dimensions except angular

DIMLFAC: Sets a scale factor for linear dimension measurements

DIMLUNIT: Sets units for all dimension types except Angular

DIMPOST: Specifies a text prefix or suffix (or both) to the dimension measurement

DIMTDEC: Sets the number of decimal places to display in tolerance values for the primary units in a dimension

DIMRND: Rounds all dimensioning distances to the specified value

DIMAZIN: Controls the suppression of zeros in tolerance values

DIMZIN: Controls the suppression of zeros in the primary unit value

DIMALTTZ: Sets the number of decimal places for the tolerance values in the alternate units of adimension

DIMGAP: Sets the distance around the dimension text when the dimension line breaks to accommodate dimension text

DIMLIM: Generates dimension limits as the default text

DIMTFAC: Specifies a scale factor for the text height of fractions and tolerance values relative to the dimension text height, as set by DIMTXT


 

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