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As a teacher I wanted to give assignments to my students, but (IMHO) the available simulators were not intuitive enough. We worked out the first version of this simulator with José Antonio Matte, an engineering student at PUC Chile. The simulator was functional but a bit unstable, so I created this second version. Please let me know if the simulator is being used in new institutions. If you find any bugs or have comments feel free to contact me.
The designation is split into two distinct parts, covering different aspects of the physical part:
Section B — Table interpretation and application (20 marks) (Use the ISO 2768‑m and ISO 2768‑k tables below — simplified values given for the exam.)
| Nominal Length Range (mm) | Class f (Fine) | Class m (Medium) | Class c (Coarse) | Class v (Very Coarse) | | :--- | :---: | :---: | :---: | :---: | | | ±0.05 | ±0.10 | ±0.20 | — | | 3 up to 6 | ±0.05 | ±0.10 | ±0.30 | ±0.50 | | 6 up to 30 | ±0.10 | ±0.20 | ±0.50 | ±1.00 | | 30 up to 120 | ±0.15 | ±0.30 | ±0.80 | ±1.50 | | 120 up to 400 | ±0.20 | ±0.50 | ±1.20 | ±2.50 | | 400 up to 1000 | ±0.30 | ±0.80 | ±2.00 | ±4.00 | | 1000 up to 2000 | ±0.50 | ±1.20 | ±3.00 | ±6.00 | | 2000 up to 4000 | — | ±2.00 | ±4.00 | ±8.00 | general tolerance iso 2768-mk
Thus, the combination "ISO 2768-mK" acts as a complete package, simultaneously governing how much a part's size can deviate and how much its shape can deviate from perfection.
Straightness limits the variation of a line on a surface, while flatness limits the variation of an entire plane. The tolerance is determined by the length of the longest side or diameter of the surface. Nominal Length Range (mm) Tolerance Class (Medium) over 10 to 30 over 30 to 100 over 100 to 300 over 300 to 1000 over 1000 to 3000 2. Perpendicularity The designation is split into two distinct parts,
ISO 2768-mK is more than just a string of letters in a title block; it is a powerful tool for clear, efficient, and global communication in manufacturing. By setting default expectations for all untoleranced dimensions, it prevents costly misunderstandings between designers and producers.
It is tight enough to ensure parts fit together without wobbling, but loose enough that a standard 3-axis CNC mill can hit it every time without inspection headaches. Nominal Length Range (mm) Tolerance Class (Medium) over
The permissible deviations for linear dimensions under the 'm' class depend on the length of the feature: Dimension Length (mm) Permissible Deviation (mm) ('m' - Medium) Over 3 to 6 Over 6 to 30 Over 30 to 120 Over 120 to 400 Over 400 to 1000
| Nominal Length Range (mm) | Permissible Deviation ('m' Class, ± mm) | | :--- | :--- | | 0.5 up to 3 | ±0.1 | | over 3 up to 6 | ±0.1 | | over 6 up to 30 | ±0.2 | | over 30 up to 120 | ±0.3 | | over 120 up to 400 | ±0.5 | | over 400 up to 1000 | ±0.8 | | over 1000 up to 2000 | ±1.2 | | over 2000 up to 4000 | ±2.0 |