GPS సహనం కాలిక్యులేటర్ — ISO 14405-1

GPS (Geometrical Product Specifications) is a framework of ISO standards for specifying and verifying workpiece geometry. ISO 14405-1 specifically covers linear size tolerances and defines how size is specified and interpreted.

The default specification operator is LP (two-point size) — measured between two diametrically opposing points. This is the traditional caliper/micrometer measurement. If no modifier is shown on the drawing, LP applies.

ISO 14405-1 defines: GG (Gaussian/least-squares), GX (maximum inscribed, for holes), GN (minimum circumscribed, for shafts), CC (circumference diameter), CA (area diameter), and others.

ISO 286 defines the limits and fits system (IT grades, fundamental deviations). ISO 14405-1 defines HOW size is measured. Together they fully specify size: ISO 286 gives the numerical limits, ISO 14405-1 gives the measurement interpretation.

The envelope requirement (Ⓔ) requires the feature not to violate a perfect-form boundary at MMC. It links size and form — the feature must fit a perfect gauge at maximum material size. This is indicated by the circled E symbol.