Transcription of GD&T REFERENCE GUIDE
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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**.
measurements must be within the given tolerance range, according to Rule #1. But with the I modifier, only the crosssectional size is to be measured. It is the equivalent of the fomer note, “Perfect form at MMC not req’d.” See paragraph 2.7.3. This can be used with the two profile symbols, and it indicates an unequal tolerance zone.
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