True Position ISO 2768-m

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

(see attached image)

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mdobb829 over 8 years ago

HI Marty,

Thank you for your input that is a great way to cover it. The pitch on the hole in question is in the over 6 up to 30 so would allow a TP of 0.565 using that method, I almost feel uncomfortable using such a high limit a great concept for using with the fine limit though.

Thanks again

That is quite a high limit, but if the Customer isn't telling you what tolerance to use, they can't argue with the results...
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mdobb829 over 8 years ago

HI Marty,

Thank you for your input that is a great way to cover it. The pitch on the hole in question is in the over 6 up to 30 so would allow a TP of 0.565 using that method, I almost feel uncomfortable using such a high limit a great concept for using with the fine limit though.

Thanks again

That is quite a high limit, but if the Customer isn't telling you what tolerance to use, they can't argue with the results...
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