To Select a Measurement Units System
1. Click > > 
Model Properties. The Model Properties dialog box opens.
Model Properties. The Model Properties dialog box opens.2. In the Units line, click change. The Units Manager dialog box opens to the Systems of Units tab. In the system list, an arrow points to your current system of units.
3. Select a system of units. A description of the metric and non-metric measurement units appears under Description. The PTC icon (blue stripes) appears in front of the descriptions of the system-provided systems of units. You can use any of the system-provided systems of units or create a custom system of units.
4. Click Set. If the units do not require scaling, the model converts to the new setting. If the units have changed, the Changing Model Units dialog box opens offering the following options:
◦ Convert dimensions—Scales the dimension values so that the model is the same size. For example, if you change a cube that is 1 inch square to millimeters, it becomes 25.4 mm square. For this option:
▪ User-defined parameters are not scaled. You must update these parameters yourself.
▪ Angular dimensions are not scaled. For example, a 30-degree angle remains at 30 degrees.
The model is regenerated.
 | To set the default for whether or not the absolute accuracy is converted when the model is converted, use the modify_abs_accuracy_on_convert configuration option. |
◦ Interpret dimensions—Does not change dimension values. Use this option if you want to get mass properties and then realize that your units are in inches. For example, if you change a cube that is 1 inch square to millimeters, it becomes 1 mm square.
After you click Set, the arrow points to your newly chosen system of units.
| | To set the default for whether or not the absolute accuracy is interpreted when the model is interpreted, use the modify_abs_accur_on_interpret configuration option. |
5. Click Close to close the Units Manager dialog box.