The Minus Tols Show Negative check box controls whether or not the minus tolerances of the dimensions will be displayed with a minus sign. For example, if the dimension is specified as 5.0000 +0.3 (upper tolerance), -0.2 (lower tolerance), the dimension line may be displayed as follows if this check box is selected:
AX |
NOM |
+TOL |
-TOL |
MEAS |
MAX |
MIN |
DEV |
OUT-TOL |
Y |
5.0000 |
0.3000 |
-0.2000 |
5.0000 |
0.0000 |
0.0000 |
0.0000 |
0.0000 |
If this check box is cleared, the same example may be displayed as follows:
AX |
NOM |
+TOL |
-TOL |
MEAS |
MAX |
MIN |
DEV |
OUT-TOL |
Y |
5.0000 |
0.3000 |
0.2000 |
5.0000 |
0.0000 |
0.0000 |
0.0000 |
0.0000 |
This check box does not affect how the values are stored or used in calculations. It only controls how the values are displayed according to user preference. This check box is not selected by default.
If you have this check box cleared, you can still have a tolerance with a minus sign in front of it. Under usual circumstances, your lower and upper limits are on opposite sides of the nominal. If this check box is not marked, the values are displayed as positive values. However, if the upper limit and lower limit are both greater than the nominal - for example, your values actually read +TOL 0.03 and –TOL –0.02 before using this check box - then your minus tol value shows a positive value when you select this check box.