Tolerances block interpretation
Tolerances block interpretation
(OP)
Our company has established certain procedure in regard to the standard tolerance block in the drawing format. Recently, I notice that the interpretation of these tolerances is awkward.
Our standard tolerance for 3 digits behind decimal is .xxx ±.005. Occasionally we have other dimensions that required tighten tolerance such as ±.002. So, in order to eliminate repetitive ±.002 on each critical dimension, we created another standard tolerance with 4 digits behind the decimal just for the ±.002. This is how it looks now:
.xxx ± .005
.xxxx ± .0020
I think the four digits tolerance should not be mixed with three digit tolerance value. I have never seen this kind of format before. Can anyone tell me if the above format violated ANSI Y14.5M-1995 standard? or latest.
Sincerely
Our standard tolerance for 3 digits behind decimal is .xxx ±.005. Occasionally we have other dimensions that required tighten tolerance such as ±.002. So, in order to eliminate repetitive ±.002 on each critical dimension, we created another standard tolerance with 4 digits behind the decimal just for the ±.002. This is how it looks now:
.xxx ± .005
.xxxx ± .0020
I think the four digits tolerance should not be mixed with three digit tolerance value. I have never seen this kind of format before. Can anyone tell me if the above format violated ANSI Y14.5M-1995 standard? or latest.
Sincerely





RE: Tolerances block interpretation
If you had .xxxx ± .002
that would be wrong.
--Scott
For some pleasure reading, try FAQ731-376
RE: Tolerances block interpretation
RE: Tolerances block interpretation
I've been told that US and EURO interpret decimal place numbers differently. In European countries; 0.01 means exactly the same as 0.0100, but in US the more decimal places would indicate a tighter (or more precise) tolerance (even though it's the same numerical value). Any comments?
RE: Tolerances block interpretation
--Scott
For some pleasure reading, try FAQ731-376