Major Dia callout for position of threaded hole
Major Dia callout for position of threaded hole
(OP)
Is "MAJOR DIA" placed under a position FCF, for threaded holes, something that should be done? Initially I was taught to do this from my first GD&T mentor. But I do not regularly see this and I can't find documentation to support this.
Thanks,
Sean





RE: Major Dia callout for position of threaded hole
Frank
RE: Major Dia callout for position of threaded hole
On a threaded stud, it may be appropriate to place "MAJOR DIA" under the positional feature control frame otherwise the positional tolerance would default to its pitch diameter.
In the above situation, one may create a checking fixture to confirm the position of the studs at its largest diameter while using a pitch diameter, one would need an additional operation of threading a checking plug onto each of the studs. The checking fixture would then apply to the plug diameter rather than the threaded stud.
Dave D.
www.qmsi.ca
RE: Major Dia callout for position of threaded hole
Thanks,
Sean
RE: Major Dia callout for position of threaded hole
The reason I ask is the only way can picture pitch being inspected with position is with a pattern (if more than 1 FOS) of pitch gages that are simultaneously threads, is that correct?
Thanks,
Sean
RE: Major Dia callout for position of threaded hole
MINOR DIA is used on a threaded hole while MAJOR DIA is used on a threaded pin. Placing MINOR or MAJOR in the wrong situation would really cause havoc.
Dave D.
www.qmsi.ca
RE: Major Dia callout for position of threaded hole
Does anyone know of where this topic is documented?
Thanks,
Sean
RE: Major Dia callout for position of threaded hole
RE: Major Dia callout for position of threaded hole
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?