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True Position ISO 2768-m

GEO3D
I am currently programming a job from drawing with a hole with no true position specified, it has boxed dimensions which would imply a true position. I've notified the customer to ask what the true position would be and they said I should be able to get the true position from the ISO Spec?

To my knowledge the ISO specification used being ISO 2768-m does not specify a true position to use for boxed dimensions with no positional tolerance, this is usually illustrated on the drawing in a tolerance frame around the hole call out? I'm looking to reply with words to that effect, am I right to say this?

I've checked the standard and I can't see anything on this, any advice would be greatly appreciated Slight smile (see attached image)





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  • The old standard ISO 2768-2 (general tolerances for form and orientation) has been withdrawn and should not be used for new constructions, the ISO 2768-1 (general tolerances for linear dimensions) has not been withdrawn yet, but the use of ISO 22081 is overall recommended.

    The main purpose of ISO 22081 is to not define "random" tolerances, but to force the designer to choose meaningful general tolerances by themselves that are less prone to misunderstandings than ISO 2768. The international ISO 22081 just provides the tools to do that, but doesn't give ANY general tolerances, whereas the German suggestion DIN EN ISO 22081 provides an appendix with exemplary tolerance tables that can be referred to by the designer.

    Still, it is expected to take a number of years to catch on, so don't panic...
Reply
  • The old standard ISO 2768-2 (general tolerances for form and orientation) has been withdrawn and should not be used for new constructions, the ISO 2768-1 (general tolerances for linear dimensions) has not been withdrawn yet, but the use of ISO 22081 is overall recommended.

    The main purpose of ISO 22081 is to not define "random" tolerances, but to force the designer to choose meaningful general tolerances by themselves that are less prone to misunderstandings than ISO 2768. The international ISO 22081 just provides the tools to do that, but doesn't give ANY general tolerances, whereas the German suggestion DIN EN ISO 22081 provides an appendix with exemplary tolerance tables that can be referred to by the designer.

    Still, it is expected to take a number of years to catch on, so don't panic...
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