REF dimensions

**Matthew D. Hoedeman** · 05-31-2006, 01:52 PM

As far as I am concerned, are REF dimension is a "do-nothing" dimension. It is for reference only, not for serious inspection. So for what you will have to do about it, if someone is requiring you to report it, I would only report the ACTUAL, no tolerance, nothing else, just the measured value.

**Underspec** · 05-31-2006, 01:55 PM

Then I will do nothing and insert a nice "REF Dimension"

Thanks.

**T Miller** · 05-31-2006, 01:56 PM

I add comment to the report and no dimension
Balloon Number xx is ref dim

**John Kingston** · 05-31-2006, 01:57 PM

Ref (or reference) dimensions are exactly that. They are for refeing to when manufacturing the part. If all other dimensions are held to nominal (and the engineer did his math correctly

) the ref dimension will be right on. They are also used to show a dimension that may be toleranced elsewhere on the print. It can help the person reading the drawing to understand a section view better. I don't balloon reference dimensions.

**JIM HARRIS** · 05-31-2006, 01:57 PM

We list them on are fairs & dips as ref. dim.

**bboyd** · 05-31-2006, 01:59 PM

Depends on the Customer but I never put REF or Basic Dimensions in my FAIR's

**kbotta** · 05-31-2006, 02:02 PM

I Never balloon, or check ref dimension's. Usually for tooling purposes - or as Matt pointed out.
Kb

**rangerboat72** · 05-31-2006, 02:11 PM

Maybe a SILLY QUESTION . . .

What are you referring to by FAIR ? ? ?

**Matthew D. Hoedeman** · 05-31-2006, 02:15 PM

Oh, it's that thing where they set up rackety rides and show pigs and sheep and have little crooked games.

**bboyd** · 05-31-2006, 02:26 PM

first article inspection report
Aerospace equivilent to PPAP (but only 1 part measured)

**BSchwark** · 05-31-2006, 02:30 PM

Originally posted by rangerboat72

What are you referring to by FAIR ? ? ?

First article inspection report but I like Matt's description better

BS

**Underspec** · 05-31-2006, 02:30 PM

LOL Matt.

**J. Pick** · 05-31-2006, 02:31 PM

REF dimensions are for tooling. I never report them in PPAP's.

**why me** · 05-31-2006, 02:39 PM

I have never balooned a Referance dimension & have never had a customer call back wanting them measured. as far as I'm concerned they are there for
tooling and exactly what they say they are for referance only, not to be toleranced.

REF dimensions

REF dimensions

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