Tools › Quality › Inspection and Metrology
Inspection and Metrology
1 tool in the Quality area.
GD&T Inspection
Inspection calculations for geometric tolerances from measured data, six analyses under one select. Position: a table of measured features against their true positions, the diametral deviation 2√(Δx² + Δy²), the bonus tolerance at MMC or LMC from each feature's actual size, the datum shift of the pattern as a whole when the datum is referenced at its material boundary (a best-fit translation within the clearance), the composite feature-relating check with the pattern free to translate and rotate, the projected tolerance zone from the entry and exit points of the axis, accept / reject with the margin, and the coordinate ± equivalent. Form from pasted points: flatness and straightness by the least-squares fit of Shakarji's NIST reference algorithms and by the exact minimum-zone (Chebyshev) fit; roundness by the Kåsa, Pratt and geometric least-squares circles, the minimum-zone, minimum-circumscribed and maximum-inscribed circles; cylindricity by the least-squares and minimum-zone cylinders; parallelism, perpendicularity and angularity of a surface to a datum plane fitted from its own points; circular and total runout from a rotation sweep with the eccentricity separated. Conversions: MMC, LMC, virtual and resultant condition, the inner and outer boundaries, the ± ↔ position equivalence and the bonus chart. Every fit is checked against the NIST L2 reference pairs and independent numerical solutions; the default case is an illustrative four-hole pattern (Ø0.250 ± 0.005 at MMC, position Ø0.010) with 12-point flatness, 24-point roundness, 24-point cylindricity, orientation and runout sets.
1 worked example reproduced, listed on the tool page.