what is difference between positional tolerance& perpendicular tolerance
what is difference between positional tolerance& perpendicular tolerance
(OP)
what is difference between positional tolerance (considering primary datum) & perpendicular tolerance





RE: what is difference between positional tolerance& perpendicular tolerance
A positional tolerance positions a feature from datums or specific feature in the XYZ planes but does not always control perpendicularity.
RE: what is difference between positional tolerance& perpendicular tolerance
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
RE: what is difference between positional tolerance& perpendicular tolerance
Are you, by any chance, thinking about quite common situation where a single secodary datum feature of size is nominally perpendicular to primary datum plane A, and this feature is controlled either by perpendicularity or position callout relative to A?
If that is the case, geometrically there is no difference between both controls, although it is worth to remember that perpendicularity is more in line with the letter of Y14.5 standard, mainly because in this very situation position tolerance adds no extra value to geometric definition of considered feature.
RE: what is difference between positional tolerance& perpendicular tolerance
Otherwise if not ISO forget it!
Frank