Min/Max vs. Limits vs. Plus/Minus 2

[LargeNCharge86]

Hello all,
There is some debate at the moment between myself and coworkers about how calling out dimensions translates into gaging.

Is there really any difference at the end of the day between calling out a dimension as min/max vs. limits vs. plus/minus? I added an image just for clarification. Thanks!

 

[TheTick]

No difference.

 

[powerhound]

The way you phrased your question makes me think that you want to put MAX and MIN on those dimensions and your coworker/s want it removed.

Is that an accurate assumption?



John Acosta, GDTP Senior Level
Manufacturing Engineering Tech

 

[LargeNCharge86]

My boss wants MIN/MAX, my coworkers want it removed, and i honestly dont think a makes a difference. I say "myself" because I'm trying to justify my boss's reasoning (that it drives a go/no-go gage) but I'm losing faith that it's accurate.

 

[TheTick]

Yeah, the min/max thing is pointless, if not amateurish. Not sure about the "legality".

 

[powerhound]

Limit dimensions are already MIN/MAX limits. No need to confuse the issue. Redundancy does not always equal clarity.

MIN/MAX is addressed in the standard in the context of being a single limit.

John Acosta, GDTP Senior Level
Manufacturing Engineering Tech

 

[dgallup]

Does the boss want min/max because he can't tell which is bigger?

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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.

 

[Belanger]

Don't use the words MAX or MIN. Two reasons...

-- It might be confusing in relation to the phrase "maximum material condition" to some people. (Especially if it's an internal dimension!)

-- The word MAX or MIN has a special context in the Y14.5 standard when it's desired to only give that one limit. For instance, a dimension of 12.9 MAX (see paragraph 2.5 of the standard)

John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems

 

[greenimi]

And one more reason J-P:
MAX. could be used in the FCF to limit additional tolerance --the bonus--see 6.4.4 and Fig 6-15. (2009)
(could be again confusing)

 

[ctopher]

Ask your boss should his glass indicate EMPTY/FULL? No.
It's simple ignorance and a little training. Your boss is your boss because he doesn't know.
Let him do the hiring, meetings, and other boss stuff ... you create the drawing like they should be done. My 2 cents.

Chris, CSWP
SolidWorks '17
ctophers home
SolidWorks Legion

 

[JR97]

Whether a dimension is gaged with a Go/ NoGo functional gage or a fully graduated gage is not based on how the dimension is printed on the drawing. It is based on whether an actual as-built dimension is required to be recorded. In our business, that is specified by categorizing dimensions as minor (no actual values needed) or major (actual values needed).