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The Role of Geometric Dimensioning & Tolerancing (GD&T) and How to Capitalise on its Value Proposition
http://www.hexagonmi.com/solutions/technical-resources/technical-articles/the-role-of-geometric-and-tolerancing-and-how-to-capitalise-on-its-value-proposition
I would say he's right...
I found this picture from a gdt article, which seems to be case close to yours. The article has been written for a well known teacher of gdt. (from ISO10579)
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Maybe the inclusion of the F meaning free state basically changes it into two different tolerances depending on how it is measured. So far I haven't found any reference as to how to use the F.
What is strange on your dimension is that the tol is smaller in the free state than in the fixing state...
The free state measurements are to a more local datum system so in theory there should be less error, but I also questioned the design engineer on this
In ISO standards, the first principle is the independancy of dimensions, so you can write the symbol in the same box without linking both dimensions...
In your case, you should tell us where are Q and J from ABC.
Q is two points that control in the Y direction located at the top of the drawing I posted, J is three points locally around the hole controlling Z, No X control.
Another point : 8888 is a BS standard, not a ISO . Maybe NB can confirm it or not ?
you are right that it is a BS standard BS EN ISO 8888, but also still ISO I believe?
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