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This section shall support you when preparing your
own design. Ceramics can be ground, lapped and
polished to extreme tolerances. Due to the
material characteristics, these tolerances will
usually remain unchanged even in severe
environments.
The table below gives you an impression about what
is possible and which price levels have to be
taken into consideration when certain tolerances
are required.
Apart from tolerances, there are some basic rules
about the design of ceramics which, when regarded,
can reduce costs and prolong the life of your
products greatly.
Please contact our application engineers for
further information. They will be happy to support
you with your particular design! |
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Tolerances |
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Measurements |
Low
priced, as fired |
Economical, ground |
High-precision,
ground |
| 0
- 3
mm |
±
0.15 mm |
±
0.05 mm |
±
2 µm |
| >
3 - 6 mm |
±
0.2 mm |
±
0.05 mm |
±
2 µm |
| >
6 - 30 mm |
±
0.5 mm |
±
0.05 mm |
±
2 µm |
| >
30 - 120 mm |
±
0.8 mm |
±
0.05 mm |
±
3 µm |
| >
120 - 400 mm |
±
1.2 mm |
±
0.1 mm |
±
4 µm |
| Straightness |
2%
of length |
0.1%
of length |
0.01%
of length |
| Flatness |
2%
of length |
0.1%
of length |
<
1 µm |
| Parallelity |
1%
of length |
0.1
mm |
2 µm |
| Rectangularity |
±
3° |
±
1° |
±
10' |
| Roundness |
2%
of Æ |
0.1%
of Æ |
2 µm |
| Radius-run-out |
2%
of Æ |
0.1%
of Æ |
2 µm |
| Position |
2%
of nominal size |
0.1
mm |
5 µm |
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Values above are typical
values, actual values might vary according to the
geometry. |
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