A coordinate illustration
For a planar point offset by Δx = 0.03 mm and Δy = 0.04 mm from a known target, the radial offset is 0.05 mm and its diameter expression is 0.10 mm: 2√(Δx² + Δy²). This is Euclidean geometry, not a GD&T pass/fail calculation.
What a full evaluation still needs
Check the feature over its required extent, the datum establishment, size and modifiers, composite requirements if present, drawing version and measurement uncertainty. An axis may tilt even if one measured section appears centered.
Circular and rectangular regions differ
A diameter-defined region must be interpreted as such. An equal-width square is not an equivalent region and must not replace it by applying ± values independently.
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Sources and review scope
Reviewed 23 October 2026. Arithmetic examples are labelled separately from source-table facts and standard scope.
KEYENCE — GD&T drawings and symbols
Manufacturer teaching: control groups, profile with/without datum relationships and theoretically exact dimensions. Not an exhaustive ASME 2018 symbol table.
Open the original source ↗KEYENCE — Measuring true position
Measurement setup and feature sampling; isolated XY deviations do not establish full feature compliance.
Open the original source ↗