Strange GDT callouts
Strange GDT callouts
(OP)
We are quoting a new job, but the print has a strange general call out box. Look at the attached PDF. We understand the profile & true position but if you look at the tolerance part the is a /1 next to the 0.007 tolerance. Any ideas as to what the /1 means? Our engineer, QA manager and I are stumped.





RE: Strange GDT callouts
Anyway you can ask the customer to confirm?
As to whether it's really legal or meaningful I'm not so sure, what drawing standard does this drawing claim to comply with?
forum1103: Drafting Standards, GD&T & Tolerance Analysis is generally a better place for this kind of question.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Strange GDT callouts
They are quoting datums A and B. Usually, you need three datums to fixture a part for inspection, as per ASME Y14.5M-1994. Perhaps they do not understand the standard.
Foundries routinely quote .005"/inch for linear tolerances on investment castings, permanent moulds and diecastings, so KENAT's comments make sense to me.
RE: Strange GDT callouts
RE: Strange GDT callouts
RE: Strange GDT callouts
the /1 is tolerance per 1 unit of how the total length is measured.
i.e. inches, millimeters, etc.
RE: Strange GDT callouts