10.3.4.1 Abrasion
Protection Plates
Large numbers of such plates are placed
in the way of impacts, glued to a substrate, to protect surfaces
against abrasion.
Close tolerances are required here for the individual plates,
so that the total tolerance of adjacent plates is kept within
reasonable limits.
A typical dimension for such plates is 100 x 100 mm. The plates
are manufactured by dry pressing, and are not machined after
firing.
According to DIN 40 680-A-m a tolerance of ± 1.8 mm
or ± 1.8 % per plate would be permissible.
Using present techniques, the total of length tolerances arising
from 10 adjacent plates does not exceed + 2 mm / - 0 mm or
+ 0.2 % / - 0 %.
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