Meaning of dimentional tolerances
Meaning of dimentional tolerances
(OP)
Hi,
What does "our industry standard dimensional tolerances of +/-0.125mm per 25mm" mean? Thanks
What does "our industry standard dimensional tolerances of +/-0.125mm per 25mm" mean? Thanks





RE: Meaning of dimentional tolerances
clear as mud ?
0.125mm = 0.005" per 1" is pretty darn tight
RE: Meaning of dimentional tolerances
What I'm not sure I agree with rb1957 on is whether it's discrete steps or proportional. I've always treated it as proportional, so (0.125/25)*Dimension, so for 80mm I'd think +/-0.4.
I've usually seen this type of tolerance expressed as "+/-0.125mm for dimensions less than 25mm, +/-0.125mm per 25mm for larger dimension" or similar.
Then again, I've actually seen "+-.005 per inch", I'm assuming your mm is trying to say the same thing, but maybe it is saying descrete steps, but it doesn't' ring true.
Note, this type of tolerance is appropriate for a design guide - it is not generally appropriate for a drawing (or MBD), at least in US documentation systems (ISO2768 does something similar though).
http://www.eng-tips.com/threadminder.cfm?pid=1103 might be better in future.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?