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3. Functional rating considerations
3.1 The futility and harmfulness of a general tolerance indication
1) Unilimited dimensions, whether minimum or maximum, cannot be tolerated, since they are the absolute tolerated limits.
2) Bilimite ratings are the result of the combination of a minimum and a maximum, each dependent on such varied conditions that their deviation can only exceptionally be the same for several ratings of the same piece.
Consequently, a general tolerance cannot be functional.
Why do most designers impose one?
because the cartouche of the drawings very often engages them;
because their boss had thoughtlessly...
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