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PC-DMIS 2020R2 – Profile ISO 1101

Hi & neil.challinor

I would like to ask you about your opinion about this issue.

We often have profile callouts similar to this |ꓵ|0.1 UZ -0.1| on our customer drawings,
where both tolerance “borders” are on one side of the nominal geometry.
I have seen these callouts since a few years from customers in the automotive industry as well as other industries.
I was looking forward to the new GeometricTolerance command to finally measure these callouts.


 ​​
Now it looks like the new command doesn’t support this kind of evaluation (at least I can’t get it to work).
PC-DMIS only allows me to put a value of maximum half the tolerance after the UZ modifier.
So I can’t have both “borders” on one side of the nominal geometry.



In my opinion these callouts are valid according to ISO 1101 as the standard doesn’t prohibit,
that both tolerance “borders” are on the same side of the nominal.
For me they would serve the same purpose as ISO Code fittings (egg. g6).

Furthermore as you also support the OZ modifier the calculation should already be supported by PC-DMIS.

What is your opinion on this?
Is this a valid callout but is not supported by PC-DMIS?
Do I understand the standard wrong?

Has anybody else these kind of callouts? What is your opinion about this?

Thank you for the answer.
Parents


  • Thank you for the answer.

    At the moment I have a part that calls for |ꓵ|0.0095 UZ -0.00975|. So greater than one time the total tolerance value.
    Unfortunately, I don’t have access to the old drawings as I changed the company recently.

    I personally would prefer to have no max. offset rule at all but maybe a warning when the offset is greater than two times the total tolerance value,
    which the user would have to accept? I think with a hard cap the same problem can occur again in the future. As you said the standard doesn't rule out big offsets. One time the total tolerance value it definitely too small, as I have seen bigger offset values before.

    What about the OZ modifier in PC-DMIS? Is there a max. offset value in the calculation behind the scene?

    If I will find any more drawings I will send you an email, could you send me the address in a PM?
  •  , you already have my email so you can send them to me if you like - I can forward things to Rob if necessary.
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