Question about pipe component drawing tolerances 1

[joedvo]

I am reviewing a German flow meter diagram. Many of the dimensions on this drawing have the typical plus or minus tolerances. Several others have a superscript or subscript tolerance. I am trying to determine the minimum thickness. If the outer diameter of this pipe component is 114mm with a subscript of -0.3mm, does that mean the OD can reduce up to 0.3mm or does it mean that the OD can exceed the nominal 114mm by 0.3mm? I am also in need of a reference standard that explains this, where can I find this in writing? Thank you!

 

[KENAT]

Take a look in the FAQ section, one of them has a list of drawing related iso specs and may give you some idea.

KENAT,

Have you reminded yourself of faq731-376 recently, or taken a look at

http://eng-tips.com/market.cfm?

 

[ctopher]

Diameter would be 113.7 per your writing.
What are the upper and lower tolerances.

ASME Y14.5M '94

http://www.engineersedge.com/training_documents/advantages_geometric_dimensioning_tolerance.htm

Chris
SolidWorks/PDMWorks 08 3.1
AutoCAD 08
ctopher's home (updated Aug 5, 2008)
ctopher's blog
SolidWorks Legion

 

[JMarv]

If the tolerance is a "subscript -0.3" I would interpret that as +0/-0.3 The zero tolerance has just been omitted. A superscript tolerance would mean +X/-0. It's not that unusual for a zero tolerance to be left off on ISO drawings.

Joe
SW Office 2008 SP4.0
P4 3.0Ghz 3GB
ATI FireGL X1

 

[ctopher]

Joe,
That was sort of my guess, but it wsn't clear to me what tolerances joedvo indicated.

Chris
SolidWorks/PDMWorks 08 3.1
AutoCAD 08
ctopher's home (updated Aug 5, 2008)
ctopher's blog
SolidWorks Legion