ASME Y14.5.1:2019 pdf free download

ASME Y14.5.1:2019 pdf free download.Mathematical Definition of Dimensioning an Tolerancing Principles.
(a) Definition. If Rule #1 does not apply, the MMC limit of the size tolerance Is a half-space formed by sweeping a ball having the diameter of the size limit along a spine of appropriate dimension for the feature (zero-dimensional point for a sphere feature of size, one-dimensional curve for a cylindrical feature of size, or a two-dimensional surface for a parallel plane feature of size). This is referred to as the MMC half-space.
(b) Conformance. For an external features, the tolerance limit is satisfied if the feature is contained within the MMC half-space for some spine. For internal features, the tolerance limit is satisfied if the feature is contained within the complement of the MMC hall-space for some spine.
(c) Actual Value. The actual mating size is the diameter of the smallest ball that can be swept along a spine so that the feature Is contained within the resulting hall-space (for external features) or largest ball that can be swept along a spine so that the feature is contained within the complement of the resulting hall-space (for Internal features).
2.3.2.3 LMC Size Limit
(a) Definition. The LMC size limit describes a half-space formed by sweeping a ball having the diameter of the LMC size limit along a spine of appropriate dimension for the feature (zero-dimensional point for a sphere feature of size, one-dimensional curve for a cylindrical feature of size, or a two-dimensional surface for a parallel plane feature of size). The resulting volume is referred to as the LMC half-space.
(b) Conformance. For an external feature, the tolerance limit is satisfied if the feature is contained in the complement of the LMC half-space for some spine. For an internal feature, the tolerance limit is satisfied if the feature is contained within the LMC half-space for some spine.
(c) Actual Value. The actual minimum material size is the largest ball that can be swept along a spine so that the feature is contained within the complement of the resulting half-space (for external features) or smallest ball that can be swept along a spine so that the feature is contained within the resulting half-space (for internal features).
2.3.3 ActuaL LocaL Size Limits
In addition to the tolerance zone containment requirements for satisfying a size tolerance, requirements on the actual local size of a feature of size may be induced from the specification. ASME Y14.5 is not overly prescriptive in its definition of actual local size, stating merely that actual local size is any individual distance at any cross section of a feature of size. In some sections of the ASME V 14.5 standard, it appears this is a point-to-point distance.