Transcription of GD&T REFERENCE GUIDE
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Example: air traffic controller
GD&T REFERENCE GUIDE
GD&T REFERENCE GUIDE . FOR SURFACE TOLERANCE ZONE CAN USE MMC CREATES VIRTUAL. NAME SYMBOL OR SHAPE (see below) OR LMC MODIFIER? DATUM REF? CONDITION? Straightness Either a, c Yes, if a Never Yes, if on Flatness Either b Yes, if a Never Yes, if on Form controls Circularity Surface d No Never No Cylindricity Surface e No Never No Profile of a Line Surface a, d, f No* Usually No Profile controls Profile of a Surface Surface b, e, g No* Usually No Parallelism Either a, b, c Yes, if a Always Yes, if on Orientation controls Perpendicularity Either a, b, c Yes, if a Always Yes, if on Angularity Either a, b, c Yes, if a Always Yes, if on Position b, c, h Yes Always Yes Location controls Concentricity c No Always Yes Symmetry b No Always Yes Circular Runout Surface d No Always Yes**. Runout controls Total Runout Surface e No Always Yes**. a = 2 parallel lines b = 2 parallel planes c = cylinder d = 2 coaxial circles *The datum REFERENCE (s) may use e = 2 coaxial cylinders f = 2 irregular line boundaries MMB or LMB modifiers, if a datum g = 2 irregular surface boundaries h = sphere.
The current standard for GD&T is ASME Y14.52009, from the American Society of Mechanical Engineers. It replaces the 1994 version. The rectangular box that contains a GD&T callout is known as the "feature control frame." A geometric tolerance shown in a feature control frame is always total, not plus/minus. Depending on how it is used, it may be
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