Perpendicularity to Two Datums | Eng-Tips Y14 5-1994 shows perpendicularity to two datums, which I've always used (Fig 6-35, p 182) Y14 5-2009 and 2018 show perpendicularity to two datums but add an angularity constraint to A|B (Fig 6-4, p 101) I believe the intent is the same, but the addition of the angularity FCF is just confusing
Perpendicularity to 3 datums | Eng-Tips The perpendicularity requirement could be a refinement of profile modified by <CF> (profile for location could be applied as a "2X" pattern) The role of the 18 non-basic dimension is not clear - if there is an attempt to apply it for location with some default title block tolerance that's not a supported practice
Perpendicularity Callout | Eng-Tips The perpendicularity callout is a zone tolerance of the perpendicularity of the flange on the tube to the axis of Datum A You take the basic location of the flange and project a line 1 2 the callout window one direction and 1 2 the other and that is your target window for the OD
Perpendicularity | Eng-Tips Perpendicularity is an angularity control but this one is set at 90 degrees It is not strictly angularity though Perpendicularity on a flat surface also includes flatness
Perpendicularity | Eng-Tips Can anyone please clarify if a perpendicularity call out is controlled by a basic dimension or not? In other words is the tolerance zone centered on a basic dimension?
Perpendicularity callout with curved datum | Eng-Tips perpendicularity: the condition of a line element, surface, tangent plane, feature’s center plane, or feature’s axis at an implied or specified basic 90° perpendicular) angle relative to one or more datum planes or datum axes
GD T (Perpendicularity Surface profile) | Eng-Tips Does it make sense to call out a perpendicularity and surface profile for the same feature w r t the same datum? Doesnt one serve to tighten negate the other? If my understanding is right, if I have a 3d curved surface whose every point must be located within parallel planes (tolerance zone)
True position with Perp control | Eng-Tips Positional to 1 hole relative to a surace reflects perpendicularity or any other angularity symbol which is the orientation Why place positional when the appropriate symbol should be perpendicularity, parallelism or angularity?