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 callout with its datum references is "legal" and fully defines the orientation of the surface The tolerance zone is perpendicular to datum A (primary), but also at a direction set by B (secondary), C (tertiary): B gives a rotation axis and C stops that rotation, finally allowing the establishment of a single specific
Typical tolerances for perpendicularity of press-fit dowel pins So the perpendicularity has been basically whatever is best effort by the machinist I also don't have precise enough equipment to measure the perpendicularity of the parts we have now Does anyone have a ballpark good value for perpendicularity of a press-fit pin? Say, a 3 or 5 mm diameter pin with an h6 ISO tolerance Many thanks!
Composite callout for perpendicularity - Eng-Tips I thought composite callouts (or even two single segments) will help somehow (that's why I called the thread Composite callout for perpendicularity), knowing that the lower segment will refine the orientation on both of these callouts (composite and or two single segments)
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 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 So, no to specific line
Using Position to control perpendicularity | Eng-Tips In the perpendicularity case, the two tolerance zones have to be perpendicular to the datum center plane A And that's all In the position case, the two tolerance zones have to be perpendicular to the datum center plane A, but also coaxial with each other
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?