Title Block and Use of "MAX"

[dthom0425]

Hi all,

I'm curious to hear your thoughts on how the use of MAX (or MIN for that matter) can be interpreted.

Say we have a dimension on a drawing shown as R.125 (radius). No tolerance associated with the dimension other than the default title block of +/- .005 for 3 place dimensions. So as shown, the feature can range from R.120-R.130.

Now, if we add the MAX nomenclature to the dimension such that it reads R.125 MAX, does that actually negate the lower limit? So if I were to be provided with a radius on the actual part of R.005, does that fall within spec because the MAX nomenclature is only specifying an upper limit? Or does the title block still apply regardless of the MAX nomenclature such that we essentially have .125 +.000/-.005?

Interested to hear your thought

Thank you

 

[greenimi]

2.5 SINGLE LIMITS
MIN or MAX is placed after a dimension where other
elements of the design definitely determine the other
unspecified limit. Features, such as depths of holes,
lengths of threads, corner radii, chamfers, etc., may be
limited in this way. Single limits are used where the
intent will be clear, and the unspecified limit can be zero
or approach infinity and will not result in a condition
detrimental to the design.

So if I were to be provided with a radius on the actual part of R.005, does that fall within spec because the MAX nomenclature is only specifying an upper limit?

Yes, it does fall within spec

Or does the title block still apply regardless of the MAX nomenclature such that we essentially have .125 +.000/-.005?

The title block does not apply because of the unless otherwise specified UOS.

 

[dthom0425]

Awesome, thank you. I missed that section in Y14.5 - thanks for pointing it out.