coax1
Aerospace
- Jun 8, 2004
- 2
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