Internal calibration lab

[table]

We would like to establish an internal calibration department. It'll be about 10 m2, contain air-conditioner etc.
Any advice would be appreciated. (What kind of devices we have to buy, which one is useful and has good quality? What are the most important things that we should pay attention?)

By the way our lab will be dimensional calibration lab and we'll calibrate micrometers, calippers

Ozan

 

[IRstuff]

Something like this?

http://www.ipnews.com/archives/quality_control/mar98/ls_starrett.htm

http://www.1gg.com/html/calibmics.html

I assume you've made the cost-benefit trade? It seems to me that you'll need a rather large volume to justify the cost of a person, the lab and the equipment.

You should have a computer with at least Word and Excel. You'll need to develop a procedure and datasheet for procedure. You may need a database program to log the calibration datato spot trends, etc. TTFN

 

[ilan7]

Ozan
As one used to tell me: The shortest destance between two points is to walk there with someone how already did...
Try to find a similar lab in your area and ask them for advice. The point is that you will need to establish good relationship with Master - Calibration lab. in order to keep your eqipment working. A local company that have similer equipment in house will be able to help you most.
If you are in Yavne area I will be happy to have you visiting our measuring lab.
Call 08-9433746 - ilan

 

[QADirector]

This is more of a request for help than an answer because I can't figure out how or where to ask this question. I want to calibrate a micrometer that reads to .001" How accurately does it need to be calibrated? I always heard that the calibration should be 10X as accurate...or using a standard that has an accuracy to .0001" Is this accurate? If so, where can I find that kind of information.

I have a dimension of .256 +/-.0005. What accuracy does the measuring device have to be calibrated to? .00005" ?

 

[IRstuff]

>> You should have posted this as a separate thread. Hijacking old threads is quite annoying

>> As for your question, calibration test accuracy ratio (TAR) is desired in documents such as MIL-HDBK-52 to be at most 1/4 of the accuracy of the instrument being calibrated. BUT, that's also dependent on the physical feasibility of achieving that level of performance.

>> What is the consequence of being higher or lower than the specified tolerance? If there are consequences, then the acceptance criteria must allow for the error in the instrument. Since this is a potential yield loss, you must balance the desire to maximize the yield vs. the cost to calibrate your instrument.

Since it is possible to get instruments that are accurate to better than 1 micron, that may still be the easier way out.

TTFN