GD&T question/symbol

[Matthew D. Hoedeman]

Well, we keep talking about screwed up prints/GD&T from idiots. Well, I got a few today that in addition to just being flat out wrong on a bunch of stuff, it has some stupid symbol that I have not seen before. Anyone got any idea WTF this is? Specifically, the area outlined in YELLOW, (the datum toleranced to itself), the CIRCLE-U 0, never seen that one before and it is not in my ASME Y14.5M-1994 anywhere that I can find. 3 bonus points to the first (real) response.

[Andrew Gardner]

I couldn't find anything in my books. Looks like a call to the engineer

[trice]

unilateral tol. found in Y14.41 and may appear in a future version of Y 14.5.'
Go to cmm talk and search for unilateral tol. you will find a good discussion about it there.

http://www.cmmtalk.com/views.aspx?topic_id=3389&forum_id=76&topic_title=New

[cmmguy]

What does the 0(zero) mean in that case?

[STANLEY]

That's a new one on me. I would just ignore it and check the part the way it should be.
I stopped complaining about prints a while ago and just check the part the way it should be. Never had a problem yet. I'll tell them up front what I'm doing, still haven't
had a problem. I should add I don't deviate far from the print.

[Matthew D. Hoedeman]

unilateral tol. found in Y14.41 and may appear in a future version of Y 14.5.'
Go to cmm talk and search for unilateral tol. you will find a good discussion about it there.

Print states it is made blah, blah, blah to ASME Y14.5M-1994, so if the circle-u is NOT part of that, it should not be there.

[#2#]

Feign illness, go home, start drinking.

[John Kingston]

Feign illness, go home, start drinking.

They already think I'm sick. don't get paid at home. Who stopped?

Sorry Matt. can't help unless you want me to run over the engineer.

[Matthew D. Hoedeman]

QUOTE=John Kingston;57596]They already think I'm sick. don't get paid at home. Who stopped?

Sorry Matt. can't help unless you want me to run over the engineer.[/QUOTE]

Oh, COULD YOU? That would help a lot!

Never stops amazing me HOW much time we waste in THIS day and age, trying to figure out what supposedly educated people do to screw up our job. Supposed to be getting 'leaner' to compete in a global market and instead we waste 10 times as much time trying to figure out what some ignorant idiot puts on a print, then can't explain it to us.

Here's another one, just for you to look at. Figure out THIS datum scheme!


[

[John Kingston]

They already think I'm sick. don't get paid at home. Who stopped?

Sorry Matt. can't help unless you want me to run over the engineer.

Oh, COULD YOU? That would help a lot!

Never stops amazing me HOW much time we waste in THIS day and age, trying to figure out what supposedly educated people do to screw up our job. Supposed to be getting 'leaner' to compete in a global market and instead we waste 10 times as much time trying to figure out what some ignorant idiot puts on a print, then can't explain it to us.

Here's another one, just for you to look at. Figure out THIS datum scheme!


[

We have Administrative Assistants Day, Take your Kid to work day, etc. Lets start "RUN OVER AN ENGINEER DAY!"

Looks like -A- should be -C- , -B- should be -A-, and -C- should be -B-.
Even that is iffy.

[phil george]

Unequal Bilateral Tolerance

http://www.tec-ease.com/tips/october-05.htm

[Matthew D. Hoedeman]

We have Administrative Assistants Day, Take your Kid to work day, etc. Lets start "RUN OVER AN ENGINEER DAY!"

Looks like -A- should be -C- , -B- should be -A-, and -C- should be -B-.
Even that is iffy.

And the one in the middle is on the left and the one on the right is an all-night DJ and the guy in the rear got drafted.

[smoke]

Maybe this DCX GD&T standard will help some.

[phil george]

Unequal Bilateral Tolerance

There's also this from a GM addendum. Although with a Zero next to the tolerance it's really just a unilateral tolerance and kind of pointless unless they just wanted to avoid drawing the ghost lines on the print. I hope they referenced one of these documents on the print otherwise it's not legit.

[DaddyBluto]

Looks like Phil wins the cupie doll. Your tolerance is all negative. I hope it is punched from that side.