ISO 2768 provides general tolerances for linear and angular dimensions that are not specified on technical drawings. To create a new test plan using the ISO 2768 tolerance classes, the selection fields are available on the “General tolerances” tab.
These specified tolerances can be used for the following measured quantities (K2009). |
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Linear Dimensions - Length Radius |
General Tolerances on Straightness and Flatness  General Tolerances on Perpendicularity  General Tolerances on Symmetry  General Tolerances on Run-Out     |
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Important Once a dataset with ISO tolerances has been created and the measured quantity has been defined, the defined tolerance class is used for the selected measured quantity of the characteristic. It is not possible to subsequently change the measured quantity or tolerance class. The configured ISO tolerances are stored in the dataset in an encrypted form. Therefore, the selected tolerance class cannot be viewed. |
Here is an example using length and straightness.
| Extract from ISO tables on linear dimensions: Permissible deviations in mm for ranges in nominal lengths |
Tolerance Class Designation | |||
| f | m | c | v | |
| 0.5 up to 3 | ± 0.05 | ± 0.1 | ± 0.2 | - |
| over 3 up to 6 | ± 0.05 | ± 0.1 | ± 0.3 | ± 0.5 |
| over 6 up to 30 | ± 0.1 | ± 0.2 | ± 0.5 | ± 1.0 |
| over 30 up to 120 | ± 0.15 | ± 0.3 | ± 0.8 | ± 1.5 |
| over 120 up to 400 | ± 0.2 | ± 0.5 | ± 1.2 | ± 2.5 |
| over 400 up to 1000 | ± 0.3 | ± 0.8 | ± 2.0 | ± 4.0 |
| over 1000 up to 2000 | ± 0.5 | ± 1.2 | ± 3.0 | ± 6.0 |
| over 2000 up to 4000 | - | ± 2.0 | ± 4.0 | ± 8.0 |
| Extract from ISO tables on straightness and flatness: Ranges of nominal lengths in mm |
Tolerance Class Designation | ||
| H | K | L | |
| up to 10 | 0.02 | 0.05 | 0.1 |
| above 10 to 30 | 0.05 | 0.1 | 0.2 |
| above 30 to 100 | 0.1 | 0.2 | 0.4 |
| above 100 to 300 | 0.2 | 0.4 | 0.8 |
| above 300 to 1000 | 0.3 | 0.6 | 1.2 |
| above 1000 to 3000 | 0.4 | 0.8 | 1.6 |
A dataset has been created using ISO 2768 tolerances 'm' and 'H'. It contains two characteristics. "Test 1" with defined "Distance" for the measured quantity and "Test 2" with defined "Straightness" for the measured quantity.
The limits and allowance fields are automatically updated according to the configured ISO 2768 tolerance class when the "Nominal value" is entered. In order to update the "Nominal value", the limits and allowance fields must first be cleared.
