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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
  • Hi Aaron,

    I agree with your comment and currently PC-DMIS is too restrictive for the offset tolerance value (currently 1/2 the total tolerance). ISO and ASME are not clear regarding a maximum value as you have indicated. We plan to change the rule for the max offset value to be equal to or larger than the total tolerance value for ASME and ISO in a 2020 R2 SP. I would like your feedback on this (ISO perspective), please e-mail me if you would like to discuss this further and can share some example callouts we need to support.

    Thanks,

    Rob
Reply
  • Hi Aaron,

    I agree with your comment and currently PC-DMIS is too restrictive for the offset tolerance value (currently 1/2 the total tolerance). ISO and ASME are not clear regarding a maximum value as you have indicated. We plan to change the rule for the max offset value to be equal to or larger than the total tolerance value for ASME and ISO in a 2020 R2 SP. I would like your feedback on this (ISO perspective), please e-mail me if you would like to discuss this further and can share some example callouts we need to support.

    Thanks,

    Rob
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