Worst case means variable ? -Resultant condition
Worst case means variable ? -Resultant condition
(OP)
Y14.5-1994 question:
I am sure I miss something, but I don't know what:
1.3.23 Resultant Condition. page 3
The variable boundary generated by the collective effects of a size
feature’s specified MMC or LMC material condition,
the geometric tolerance for that material condition,
the size tolerance, and the additional geometric tolerance
derived from the feature’s departure from its
specified material condition.
Appendix A - page 199
Resultant condition is introduced and explained as
a worst case inner locus or outer locus condition.
I am sure I miss something, but I don't know what:
1.3.23 Resultant Condition. page 3
The variable boundary generated by the collective effects of a size
feature’s specified MMC or LMC material condition,
the geometric tolerance for that material condition,
the size tolerance, and the additional geometric tolerance
derived from the feature’s departure from its
specified material condition.
Appendix A - page 199
Resultant condition is introduced and explained as
a worst case inner locus or outer locus condition.





RE: Worst case means variable ? -Resultant condition
"Know the rules well, so you can break them effectively."
-Dalai Lama XIV
RE: Worst case means variable ? -Resultant condition
What is RC:
a.) The variable boundary generated by the collective effects .............
b.) A worst case inner locus or outer locus condition.........................
The other options you could eliminate and does not have a AND b option:)
What would you do?
RE: Worst case means variable ? -Resultant condition
So I would wait for 2009 exam.
RE: Worst case means variable ? -Resultant condition
The answer is the committee was not structured for workers on different sections to review each other's work. This introduced a number of conflicts, such as this one. In addition, they were adding definitions for cases that are of dubious value - such as resultant condition - for descriptive completeness. In this case, the Appendix writer's were wrong.
Looking at 2.11.2 and the associated figures 2-7 to 2-12 support that Resultant Condition varies based on the combination of feature 'actual mating envelope' (AME) and the affect the AME has on the available tolerance to describe the unreachable volume of the feature. For example - 2-7, External feature. The minimum size of the pin .29.5 and they subtract another 0.5 for position tolerance to leave 29.0, which is a diameter that would be perfectly positioned and still be inside the solid pin. Since it is inside the pin, it is unreachable.
The definitions flip for LMC. For no good reason they are not applicable to RFS.
RE: Worst case means variable ? -Resultant condition
1973 - basis
1982 = 9 years
1994 = 12 years
2009 = 15 years
Extrapolating, the next version will follow an 18 year gap -> 2027?
RE: Worst case means variable ? -Resultant condition
The definition of RC was changed in 2009 to be a worst-case constant value. So it's fun to talk about this in 1994, but they've cleaned it up so it's no longer an issue.
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
RE: Worst case means variable ? -Resultant condition
RE: Worst case means variable ? -Resultant condition
So it's constant because that's how they define it, not because of any inherent concept. Still a improvement, I would say.
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
RE: Worst case means variable ? -Resultant condition
What was puzzling was the lack of utility of the concept for Resultant Condition. They spent a lot of effort on it for 1994 and then threw most of that away, but there's no reason given to even have it.
RE: Worst case means variable ? -Resultant condition
Ref: certification exam:
Are you saying that you are not going to be tested from the appendix?
RE: Worst case means variable ? -Resultant condition
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems