【转帖】question about pipe component drawing tolerances

yang686526

question about pipe component drawing tolerances
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!  
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,
diameter would be 113.7 per your writing.
what are the upper and lower tolerances.
asme y14.5m '94
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
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