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proper temperature for inspection. where? why?
3

proper temperature for inspection. where? why?

proper temperature for inspection. where? why?

(OP)
I have an inspection question.  Wherever i have worked they always say that the part, surface to inspect on, and the gaging equipment must all be between 68-72 degrees F.  

Where is this officially stated?  

Does anyone have experience with heat charts/graphs to machine and inspect parts in a 70-80 degree building, but also pass inspection once in the 68 degree CMM room?  

thanks,

RE: proper temperature for inspection. where? why?

ASME Y14.5-1994, Section 1.4 Fundamental Rules, paragraph (k)
"Unless otherwise specified, all dimensions are applicable at 20C (68F).  Compensation may be made for measurments made at other temperatures."

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RE: proper temperature for inspection. where? why?

Also see ASME B89.6.2-1973 (reaffirmed 2003), "TEMPERATURE AND HUMIDITY ENVIRONMENT FOR DIMENSIONAL MEASUREMENT".  This standard has a lot of good information on tempature and humidity compensation in measurements, coefficient of expansion ratios, thermal conductivity, etc.  All good things that an inspection shop should know and follow.

GDT_GUY

RE: proper temperature for inspection. where? why?

GDTGUY - is correct with that ASME B89.6.2 is a must have specification for setting up company QA standards.  We have parts that are machined from unobtainium that require special inspection processes.  A for you

Heckler
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