The Size command defines four different modes. These modes allow you to enter, calculate, and report different kinds of size calculations:
The Size command in this mode does the following:
It records a nominal size, an upper deviation limit, and a lower deviation limit.
It calculates the unrelated actual mating envelope. The command also calculates a long list of local sizes.
It reports the actual mating envelope. The command also reports the worst of the local sizes.
ISO 14405-1, Nominal with Deviation
The Size command in this mode records a nominal size, an upper deviation limit, and a lower deviation limit.
If there is a single specification operator, the operator applies to both limits.
If there are two specification operators, each operator only applies to one limit.
If a specification operator is a global size, that global size is computed, and the report compares the global size to the applicable limit or limits.
If a specification operator is a local size, a long list of those local sizes is computed, and the worst local size is reported for each applicable limit.
The Size command in this mode records a nominal size and an ISO code. This information, together with ISO 286-1, define the limits of size.
The ISO 286-1 standard defines hundreds of tolerance codes that look somewhat like "E9" and "H7". These tolerance codes are all supported by the size command. Reporting is much like the ISO nominal-with-deviations mode.
You should use this mode with the range of sizes modifier defined by ISO 14405-1 (the text SR enclosed in an oval).
The Size command in this mode does the following:
It only records one specification operator.
It does not record a nominal size, nor limits on deviations.
It records a single tolerance value, because the range of sizes modifier produces specification operators that are similar to form tolerances. For an example, see Figure 17 in the ISO 14405-1 standard. Reporting in this mode is similar to reporting for form tolerances.
Contact the Documentation Team
PC-DMIS 2019 R2
Copyright © 2019 Hexagon Manufacturing Intelligence – Metrology Software, Inc.
Help System last generated on 22 July 2019