1. Tolerances and fits
Only the information essential for understanding the subject of smooth gauges is given here.
1.1 General
The inevitable imprecision of manufacturing processes, combined with the fact that perfect dimensional accuracy is not necessary for most machined parts, has led to the concept of tolerances.
In fact, for a feature of a part to fulfil its function correctly, it is sufficient for its actual dimensions to lie between two permissible limit dimensions, the difference between which constitutes the dimensional tolerance.
On the other hand, interchangeability - the basic concept of modern, economical manufacturing - and the need to increase international trade opportunities led to the principle of adjustment....
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Mechanical and dimensional measurements
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Tolerances and fits
Interpretation of part dimensional limits
Standardization
French standards
Association Française de Normalisation (AFNOR): http://www.afnor.fr
- Système ISO de tolérances et d'ajustements - Partie 1 : base des tolérances, écarts et ajustements (identique ISO 286-1). - NF EN 20286-1 - 12.93
- Système ISO de tolérances et d'ajustements - Partie 2 : tables des degrés de tolérance normalisés et des écarts limites des alésages et des arbres (identique ISO 286-2)....
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