| Scaling Tolerance Variables |
| List of: | Discussion Topic | |
| Subjects: | Precision and Tolerance | |
| Contents: | Fundamental Concepts | |
| For interchange of model data between systems, the "real-world" distance represented by SPAresabs and the actual numeric value of SPAresnor in the two systems should agree. The "real-world" distance refers to an application's interpretation of the numerical value of SPAresabs in conjunction with the assumed units as the distance represented. | |||||
| For example, two applications may use different numeric values for SPAresabs, but if they assume different units as well, the distance represented by SPAresabs may be the same. If application M uses a unit of millimeters and has a SPAresabs value of 10-6 and application N uses a unit of meters and has a SPAresabs value of 10-9, the "real-world" distance represented by SPAresabs is the same in each application, because 10-6 millimeters = 10-9 meters. The largest dimension represented in each is also equivalent, because SPAresnor does not change. In application M, the largest dimension is 104 millimeters, which is equivalent to the 101 meters representable in application N. | |||||
| The object transferred should be scaled by the restoring system to maintain the object's original "real-world" size in the restoring system's units. When an object is scaled, the absolute tolerance for which the model is valid is scaled by the same amount. | |||||