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.”
Under Tolerance Format, set the following tolerance display options:
- Method: Sets the tolerance method. None turns off display of tolerances. Use Symmetrical when the tolerance plus or minus values are the same, and use Deviation when plus or minus values differ. Limits incorporates plus or minus values into the dimension value and displays the maximum dimension over the minimum. Basic draws a box around the dimension text, a format often used to indicate theoretically exact dimensions. Basic is also controlled by the Draw Frame Around Text option on the Text tab. Changing one of these options changes the other.
- Precision: Sets the number of decimal places for tolerance values.
- Upper Value: Sets the upper value for deviation and limits methods. AutoCAD also uses this value for symmetrical tolerances.
- Lower Value: Sets the lower value for deviation and limits methods.
- Scale Factor for Height: Sets the tolerance text height as a scale factor of the primary measurement text height.
- Vertical Position: Sets vertical position for symmetrical and deviation tolerances. Top aligns the tolerance text with the top of the dimension text, Middle with the middle, and Bottom with the bottom of the dimension text.