If a Blueprint calls for ASME Y14.5 wouldn't this be the standard rules apply. How would I know if and when to apply ISO? I have yet to see anything on a blueprint stating this. The reason I bring this up is for the good old Profile callout. Before I make an argument, I want to cover all my resources. Customer already claims in an email that PC-DMIS is not capable of doing this. I and everyone on here already that's horse_S_H_I_T. But its Friday and I'm ready to P_I_S_S someone off
Y14.5 is a tolerancing standard, not a reporting standard. It does not absolutely require a part to be held in a certain way when it's machined. All it does is describe the size and shape of tolerance zones and datums. Nothing that I'm aware of says to report anything in a specific fashion. It's convenient to try and reduce things down to a single useful number. However, most things in the standard, including profile and position, simply can't be reduced to a single useful for all things number. Identical position numbers by the formula can have a near infinite number of XY locations. Doubling deviations might make sense on an equally disposed profile callout but fall apart on unequal disposed profile callouts. I've even seen ++ and -- profile requirements. WIth flatness and straightness, you will want to know how and where the part is not flat or straight. The single numbers are nice but context in the form of XYZ points is what's required to make decisions on.
Y14.5 is a tolerancing standard, not a reporting standard. It does not absolutely require a part to be held in a certain way when it's machined. All it does is describe the size and shape of tolerance zones and datums. Nothing that I'm aware of says to report anything in a specific fashion. It's convenient to try and reduce things down to a single useful number. However, most things in the standard, including profile and position, simply can't be reduced to a single useful for all things number. Identical position numbers by the formula can have a near infinite number of XY locations. Doubling deviations might make sense on an equally disposed profile callout but fall apart on unequal disposed profile callouts. I've even seen ++ and -- profile requirements. WIth flatness and straightness, you will want to know how and where the part is not flat or straight. The single numbers are nice but context in the form of XYZ points is what's required to make decisions on.
Bingo! And the same goes for ISO - it defines the tolerance zones, i.e. defines PASS/FAIL condition, but doesn't say anything about how to present actual deviations.
