Metrology fundamentals
Metrology fundamentals
(OP)
Hello,
just to be sure:
is a thesis that "measurement should be done with an instrument which resolution is 10x greater than measured eg. length" is a "golden rule" or is it described in any norm?
example: to avoid measurement error analysis for length 23,5 I should use caliper with resolution 0,01,
or for length 23,54 I should use caliper with resolution 0,001?
thanks in advance
just to be sure:
is a thesis that "measurement should be done with an instrument which resolution is 10x greater than measured eg. length" is a "golden rule" or is it described in any norm?
example: to avoid measurement error analysis for length 23,5 I should use caliper with resolution 0,01,
or for length 23,54 I should use caliper with resolution 0,001?
thanks in advance





RE: Metrology fundamentals
Might be in ANSI B4.4M (not sure if that's an ASME now).
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Metrology fundamentals
Doug
RE: Metrology fundamentals
Note, however, just because one specific tool has a TAR of 10:1 does not necessarily mean that an analysis can be ignored. There may be other factors that might magnify errors in other parts of the system.
TTFN

FAQ731-376: Eng-Tips.com Forum Policies
Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers
Of course I can. I can do anything. I can do absolutely anything. I'm an expert!
There is a homework forum hosted by engineering.com: http://www.engineering.com/AskForum/aff/32.aspx
RE: Metrology fundamentals
We just had a TS16949 audit and the auditor insisted that every gauge had to have at least 10 increments in either direction from nominal to the upper or lower limit. We got dinged because we were measuring a +/-8 micron tolerance with a 1 micron resolution gauge.
----------------------------------------
The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.
RE: Metrology fundamentals
TTFN

FAQ731-376: Eng-Tips.com Forum Policies
Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers
Of course I can. I can do anything. I can do absolutely anything. I'm an expert!
There is a homework forum hosted by engineering.com: http://www.engineering.com/AskForum/aff/32.aspx
RE: Metrology fundamentals
RE: Metrology fundamentals
I didn't get clear answer but they motivate me to look at the problems from other angle.
RE: Metrology fundamentals
"Know the rules well, so you can break them effectively."
-Dalai Lama XIV
RE: Metrology fundamentals
If I wanted to be very sure that a +/-.25 tolerance was met, but had a tool that was +/-.03 I'd change the inspection limits to no larger than +/-.22. To get to .+/-.249, the instrument accuracy would have to be +/-.001.
Like I said, it depends on how things will be if you don't know what you are paying for and what you are throwing away. The closer to the edge, the more it costs and the more careful you need to be.
RE: Metrology fundamentals
RE: Metrology fundamentals
A.
RE: Metrology fundamentals
----------------------------------------
The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.
RE: Metrology fundamentals
RE: Metrology fundamentals
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
[IMG http://tinyurl.com/7ofakss]
Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers
Of course I can. I can do anything. I can do absolutely anything. I'm an expert!
There is a homework forum hosted by engineering.com: http://www.engineering.com/AskForum/aff/32.aspx
RE: Metrology fundamentals
RE: Metrology fundamentals
This was the effect of the false economy that certain pols have continued to preach, even now.
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
[IMG http://tinyurl.com/7ofakss]
Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers
Of course I can. I can do anything. I can do absolutely anything. I'm an expert!
There is a homework forum hosted by engineering.com: http://www.engineering.com/AskForum/aff/32.aspx