maximum hole diameter and minimum shaft diameter LMS: The dimension defining the least material condition of a feature. Used when defining a reference surface using one or more daturm target features LMC: Least material condition of a component at that limit of size where the material of the feature is at its minimum everywhere, e.g. CM: Common zone, Applying single set of geometrical tolerances to a number of separate features DTI:Datum target indication. Notation Note: The following descriptions are very much shortened versions of those found in the standards and are not considered to be definitive.
Reference Standards BS ISO 1101:1983 Technical Drawings - Geometrical tolerancing - Tolerancing of form, orientation, location and run-out - Generalities, definitions, symbols, indications on drawings BS ISO 5459:1981 Technical Drawings - Geometrical tolerancing - Datums and datum-systems for geometrical tolerances BS EN ISO 2692:2006 Geometrical product specifications (GPS) Geometrical tolerancing Maximum material requirement (MMR), least material requirement (LMR)and reciprocity requirement (RPR) BS ISO 8015:1985,Technical drawings Fundamental tolerancing principle BS ISO 10579:1985,Technical drawings -Dimensioning and tolerancing Non-rigid parts Detailed notes are found in the identified standards and it is suggested that these standards are consulted for clearest understanding of the requirements. Introduction These notes attept to clarify the meanings of the supplimentary symbols used for geometric tolerancing. Home Drawing Page Geometrical Tolerances Geometrical Tolerancing Introduction.
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