10.3.3.2 Hard
Machined Ceramic
For parts made of technical ceramics for
machine construction applications, the tolerances mentioned
above for functional surfaces are often inadequate for the
user's needs. For this reason, tolerances for ceramic parts
in accordance with
DIN ISO 2768-m-K
are quoted. These can be achieved through
hard machining.
Drawing specifications
Should it be necessary to specify a different level
of precision for the straightness to that specified for the
shape, this must be noted additionally in this block.
E.g.: general tolerance DIN 40 680-A-m
general tolerance
DIN 40 680-B-g
The rules for identification and quotation
on drawings apply correspondingly to flatness and cylindrical
form.
See DIN 40680 for further details and examples.
Table 31: General tolerances
for straightness
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