Dimension to Intersecting Corner
Dimension to Intersecting Corner
(OP)
Hello,
Question about ASME Y14.5.
When a drawing is dimensioned to a sharp point of two intersecting surfaces or planes and there is a note on the drawing requiring break edges, how does the inspector know (from the ASME Y14.5) to inspect to the broken corner or the point in space where the surfaces or planes would have intersected prior to the deburring or breaking the corner?
Question about ASME Y14.5.
When a drawing is dimensioned to a sharp point of two intersecting surfaces or planes and there is a note on the drawing requiring break edges, how does the inspector know (from the ASME Y14.5) to inspect to the broken corner or the point in space where the surfaces or planes would have intersected prior to the deburring or breaking the corner?





RE: Dimension to Intersecting Corner
Good question. I run into this problem sometimes.
If you prepare a straight plus/minus drawing without datums, I would measure from the physical edge of the point, i.e. tangent to the radius.
You need to prepare your drawings carefully.
If your two angled surfaces are datums_A and_B, or datums_B and_C, anything positioned from these datums comes from the theoretical sharp point.
Sometimes, I have the problem of dimensioning to the sharp point. Make the dimension basic. Apply a profile tolerance to the angled face. Think your datums out carefully. Typically, I am primarily concerned with the position of the flat face, rather than of the sharp point.
RE: Dimension to Intersecting Corner
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.
RE: Dimension to Intersecting Corner
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Dimension to Intersecting Corner
Should you dimension to it? Both standard demonstrate yes, but never explain what that means in terms of tolerancing. There is no need to label the dimension if you do so, however.
WWMD? (what would matt do?) I dimension to the point location when it was obvious what was meant or use a reference dim.
Matt Lorono, CSWP
Product Definition Specialist, DS SolidWorks Corp
Personal sites:
Lorono's SolidWorks Resources & SolidWorks Legion
RE: Dimension to Intersecting Corner
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.
RE: Dimension to Intersecting Corner
RE: Dimension to Intersecting Corner
"Art without engineering is dreaming; Engineering without art is calculating."

Have you read FAQ731-376: Eng-Tips.com Forum Policies to make the best use of these Forums?
RE: Dimension to Intersecting Corner
I hate TLAs.
I strongly recommend not using them. If you are using ASME Y14.5, you can use datums, basic dimensions and feature control frames, and make your requirements clear to everyone. There is no reason to resort to obscure terminology.
RE: Dimension to Intersecting Corner
RE: Dimension to Intersecting Corner
Obscurity is a pet peeve here as well.
(No offence intended to the Two-hundred, Thousands, Trillions or any other T-number not specifically enumerated here.)
RE: Dimension to Intersecting Corner
From a recient topic of discussion in the yahoo group GD&T forum it appears like we know less and less about how to set-up measurement without formal GD&T.
When I was taught the 1982 standard the line was that there is no legal definition without referencing the standard. It seems now with the 1994 & 2009 there is less certainty of definition of the intent of plus and minus dimensions than I was led to believe then.
Frank
RE: Dimension to Intersecting Corner
I don't think we have lost the knowledge of how to set up the measurements. We have stopped believing that we can set up the measurements. We have never actually been able to do this.
Far more important than GD&T, standards like ASME Y14.5 tell us exactly what the drawing means.
RE: Dimension to Intersecting Corner
What you can do if the tool maker and inspector in factory is not very understanding about profile tolerance, the intersection point gives me a good idea, after the calculation its easy to get max point (the outer profile boundary intersection point) and the min point ((the inner profile boundary intersection point), just tell them it's a good part as long as the intersection points lies between the max and min point on each respective points.
SeasonLee
RE: Dimension to Intersecting Corner
Jim Sykes, P.Eng, GDTP-S
Profile Services www.profileservices.ca
TecEase, Inc. www.tec-ease.com