Model-Based Definition > Model-Based Definition > Creating Various Annotation Types > Tolerances > Working with Dimensional Tolerances > Dimensional Tolerance Basics > Specifying Default Dimensional Tolerances
Specifying Default Dimensional Tolerances
When you begin creating a model, Creo Parametric uses default dimensional tolerance values. Therefore, you must specify default tolerances beforehand by setting the configuration file options linear_tol and angular_tol. Using linear_tol, you can set default tolerances for integer dimensions as well.
A linear dimensional tolerance does not have to have the same number of decimal places as the dimension. That is, dimensions can acquire tolerances that have a higher significant number of decimal places (num digits).
For example, a dimension with six decimal places can have a tolerance value with seven decimal places. To set the default display of linear dimensional tolerances, specify the value of linear_tol as follows:
# tolerance x
- where # is an integer representing the number of decimal digits for the dimension, tolerance represents the default tolerance value, and x specifies the number of decimal digits for the tolerance.
The x value must be equal to or greater than the # value. If x is less than #, the system uses the default value (equal to the number of decimal digits for the dimension) and rounds it to the significant number of digits of the dimension.
* If you do not include x in the value, the system sets the default display equal to the number of decimal digits of the dimension.
Linear_tol 0 .05 2
For the tolerances specified in the example, a dimension of a whole number would have a tolerance of .05.
When you begin creating a part, the system displays a table at the bottom of the window with the current default tolerances. This table appears only when you have set the configuration file option tol_display to yes.
If you have not specified tolerances, Creo Parametric assumes the system defaults.