Section 2.1.1.2 Allows for a note to specify that untoleranced dimensions are basic (not needing to use basic boxes on dimensions)if this note is used it also states that general dimension tolerances are not allowed. I read this to clarify that all other dimensions (not basic) need to be individually tolerance. Is this correct?
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ANSI Y14.5 2009
- Thread starter Rick B
- Start date
Yes. What other mechanism would one use? The individual tolerance might be directly applied, though I wouldn't argue against using a flag note if so desired. TACOM, part of the US DOD, requires only directly applied tolerances for non-basic dimensions.
Rick,
I would say yes, unless you want to confuse whoever is reading the drawing. If you specify that untoleranced dimensions are basic, while also including a general print tolerance how is anyone supposed to tell which one applies? And if you include such a note, what exactly are you applying the print tolerance to? It just creates confusion.
Now if you want to have your cake and eat it too you could include another note either on EACH dimension saying "GENERAL PRINT TOLERANCE APPLIES" or "IS BASIC" or any other combination of additional notes/symbols but this seems not only excessive (more work) but also an additional layer of confusion. At that point I would just resort to standard notation.
I would say yes, unless you want to confuse whoever is reading the drawing. If you specify that untoleranced dimensions are basic, while also including a general print tolerance how is anyone supposed to tell which one applies? And if you include such a note, what exactly are you applying the print tolerance to? It just creates confusion.
Now if you want to have your cake and eat it too you could include another note either on EACH dimension saying "GENERAL PRINT TOLERANCE APPLIES" or "IS BASIC" or any other combination of additional notes/symbols but this seems not only excessive (more work) but also an additional layer of confusion. At that point I would just resort to standard notation.
Rick B,
ASME Y15.6-2009!
The general tolerances note applies to all dimensions that are not explicitly toleranced. If you a note specifying these dimensions as basic, then the general tolerances cannot apply. If you have a metric drawing, note[ ]1.6.1 forbids trailing zeros on metric dimensions. The general tolerance note is not functional on metric drawings.
I find it is easy to apply explicit tolerances to metric drawings. If there is a problem with tolerance stacks, it is an engineering problem, not a drafting problem.
--
JHG
ASME Y15.6-2009!
The general tolerances note applies to all dimensions that are not explicitly toleranced. If you a note specifying these dimensions as basic, then the general tolerances cannot apply. If you have a metric drawing, note[ ]1.6.1 forbids trailing zeros on metric dimensions. The general tolerance note is not functional on metric drawings.
I find it is easy to apply explicit tolerances to metric drawings. If there is a problem with tolerance stacks, it is an engineering problem, not a drafting problem.
--
JHG
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