Temperature inspection room 1

[frugby1]

Do you know if any norm (ISO 9001 for example) imposes a temperature and a tolerance for the inspection room (mainly used for incoming goods). Thanks!

 

[tomwalz]

Darned good question.

I remember standing on a loading dock measuring a prototype piece for the B2. it was about 8 feet long. We deliberately delivered it first thing in the morning. As we measured it and they measured it the sun started hitting it and it started growing. Not only couldn’t the customer determine if it was in spec, they couldn’t get the same measurement twice.

Specifications were way too tight for a part that big but I had a partner who said we could build it. I still think we built it right but we never got paid for it. They didn’t say it was out of spec. They could just never determine if it was in spec so we never got paid.

Maybe the coolest part we ever built, though.


Thomas J. Walz
Carbide Processors, Inc.

http://www.carbideprocessors.com

Good engineering starts with a Grainger Catalog.

 

[dbooker630]

At our shop the receiving inspection area is at ambient temperature but the CMM layout and gage calibration rooms are held at 68F +/- 3F and 45% +10%RH. You may want to check ISO 17025 to see how environmental controls are called out.

 

[KENAT]

"Unless otherwise specified, all dimensions are applicable at 20°C(68°F). Compensation may be made for measurements made at other temperatures.

It doesn't give a tolerance on the temp, I'd suggest it needs to be accommodated in the typical 10% inspection allowance.

ANSI B4.4M-1981 (or newer version if there is one) Inspection of Workpieces may give some info.

Posting guidelines faq731-376

http://eng-tips.com/market.cfm?

(probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484​

 

[Duwe6]

Concur on 20-deg C. Had the same problem of measurement on a loading dock QC station in California. Wanted to tell us that the 42" part plus 0", minus 0.001" was too big. As soon as the idiots put the part in the actual QC lab and let it cool to 20-deg C., part was perfect 42.0005".