Estimate of uncertainty for thread-measurement standards : Virtual diameter on flanks

Virtual diameter on flanks
Estimate of uncertainty for thread-measurement standards

Author : Georges-Pierre VAILLEAU

Publication date: December 10, 2007 | Lire en français

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8. Virtual diameter on flanks

The formulas for calculating the diametrical equivalents of the pitch and flank angle errors are: $E_{p} = \frac{2 Δ P}{tan α_{1} - tan α_{2}}$ $E_{α} = \frac{1}{2} [\frac{L_{1}}{sin α_{1}} tan | Δ α_{1} | + \frac{L_{2}}{sin α_{2}} tan | Δ α_{2} |]$

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Virtual diameter on flanks

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page Consideration of unmeasured elements

Calculation examples

Bibliographic references

(1) - AFNOR XP E 03-110. Décembre 2003 - Spécification géométrique des produits (GPS) – Filetage – Vérification par mesure directe - .
(2) - AFNOR NF E 03-000. Décembre 1985 - Filetages – Définitions des termes usuels. Termes particuliers aux filetages triangulaires, cylindriques et coniques - .

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Virtual diameter on flanks Estimate of uncertainty for thread-measurement standards

8. Virtual diameter on flanks

Bibliographic references

Virtual diameter on flanks
Estimate of uncertainty for thread-measurement standards