huangyhg

proper temperature for inspection. where? why?
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,
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."
"art without engineering is dreaming; engineering without art is calculating."
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
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
sr. mechanical engineer
swx 2007 sp 3.0 & pro/e 2001
xp pro sp2.0 p4 3.6 ghz, 1gb ram
nvidia quadro fx 1400
o
_`\(,_
(_)/ (_)
(in reference to david beckham) "he can't kick with his left foot, he can't tackle, he can't head the ball and he doesn't score many goals. apart from that, he's all right." -- george best
promoting, selling, recruiting and student posting
are not allowed in the forums.
(add stickiness to your site by linking to this professionally managed technical forum)
title: drafting standards,
description: drafting standards, gd&t & tolerance analysis technical support forum and mutual help system for engineering professionals. selling and recruiting forbidden.

__________________
借用达朗贝尔的名言：前进吧，你会得到信心!
[url="http://www.dimcax.com"]几何尺寸与公差标准[/url]