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Basics of Coordinate Metrology
Unit 6: Basics of Metrology - Dimensions and Tolerances |
Step 4 of 8
Next |
| To make sure that the
parts of the technical drawing can be manufactured correctly, the
design engineer enters the individual dimensions on the drawing.
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| Since the design engineer
knows that it is impossible to manufacture with 100% precision, he
additionally enters the tolerances for the dimensions: |
Figure 1:  Figure 2: |
The following dimensions are used:
Figure 1 (left): |
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Figure 2 (right): |
| 19.8 mm |
Min. dim. |
20.1 mm |
| 20.0 mm |
Nom. dim. |
20.0 mm |
| 20.2 mm |
Max. dim. |
20.2 mm |
| 0.4 mm |
Tol. width |
0.1 mm |
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This means that the part
may have
- in the left figure: a side length of at
least 19.8 mm and at most 20.2 mm.
- in the right figure: a side length of
at least 20.1 mm and at most 20.2 mm.
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