Tolerances on Drawing Title Block

K

Kamranabbasian

#1
I am wondering if there is any requirement from ISO 9001 or TS standard that drawing tolerances have to be per specific standard.
We are a manufacturer of electrical protection devices (Shuntrip, combiner boxes and enclosures).
The issue is our drawing for our enclosures suppliers (sheet metalworking and fabrication section) has a tolerance of +/-0.005” or0.010” in title block. This is much tighter than what we really require.
I want to know if make these tolerances wider and do not reference it to any standard, are we going to be in trouble for ISO or customer audit?
Also, is there any specific standard for dimensional tolerances in sheet metal working and fabrication industries? Then we can apply that standard in our tolerances.
Thank you
 
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Jim Wynne

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#2
There are no ISO 9001:2008 or ISO/TS 16949 requirements for tolerances to be based on a published standard. There are ISO standards available for tolerancing, bit there is no requirement to use them.

Your tolerance should reflect what's actually needed in the assembly and by the customer. I know firsthand that lots of time and money is wasted by the annoying habit of designers defaulting to block tolerances. If tolerances need to be tighter or looser than what the block says, they should be made tighter or looser.
 
S

silentrunning

#3
Jim is right - you can change it to whatever works for you. I would however be sure to get the signature of the design engineer or project manager on the print before doing it.
 
P

PaulJSmith

#4
If it's your design, then you set the tolerances you require. There is nothing in ISO 9001 to "standardize" that. The only limitation might be your fabricator's capabilities to hold tight tolerances, which they should be able to tell you with any quote.

We recently went through this with one of our suppliers. They were not comfortable with our ?0.007 on some formed edges, so we expanded it to ?0.015 where appropriate. Everyone was happy.
 
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