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  17025, Guide 25, A2LA (Cal., Meas., and Test)
  In house calibration

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Author Topic:   In house calibration
AviGeva
Lurker (<10 Posts)

Posts: 4
From:Ganey Tikva 55900, Israel
Registered: Apr 2000

posted 11 July 2001 04:24 AM     Click Here to See the Profile for AviGeva   Click Here to Email AviGeva     Edit/Delete Message   Reply w/Quote
Hello there,
I am thinking of going into in house calibration for clippers, micrometers etc.
I believe that it will save som emoney to the company.
I wonder if some one could help me and email me tamplates, generic forms (Word or Excel) or ideas how these procedures should contain and look like.

Thanks a lot

avigeva@rada.com

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Dave Stauffer
Lurker (<10 Posts)

Posts: 3
From:O'Fallon, MO, USA
Registered: Jul 2001

posted 18 July 2001 09:46 PM     Click Here to See the Profile for Dave Stauffer   Click Here to Email Dave Stauffer     Edit/Delete Message   Reply w/Quote
Please send your e-mail address to DECONDAVE@aol.com and I can help.

------------------
Dave Stauffer

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Al Dyer
Forum Wizard

Posts: 814
From:Lapeer, MI USA
Registered: Oct 2000

posted 18 July 2001 10:00 PM     Click Here to See the Profile for Al Dyer   Click Here to Email Al Dyer     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Dave Stauffer:
Please send your e-mail address to DECONDAVE@aol.com and I can help.


You can upload files here with your browser - see the link near the top of the page - and share them with everyone, Dave. Otherwise we end up a a long thread of nothing but requests from others and you end up with a lot of e-mails.

'ASD...

*********

Link added: See CAL_PROC.pdf at /pdf_files/ for some ideas as well.

[This message has been edited by Marc Smith (edited 18 July 2001).]

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Ken K
Forum Contributor

Posts: 47
From:Wisconsin, USA
Registered: Jun 2000

posted 19 July 2001 01:36 PM     Click Here to See the Profile for Ken K     Edit/Delete Message   Reply w/Quote
I looked over the calibration procedure referenced in Al's post, and I would like to address what I feel could be a real problem.
The first step mentioned is to clean the gage. If the gage was out on the floor, used to check outgoing goods, I would want to know if that gage was within tolerance before I would do anything to it.
My first step would be to try to calibrate it before proceeding. That way, if a problem is found, you know it was that way when it came off the floor.
I think this is critical. Then proceed to clean, examine and calibrate.

Just my thoughts.

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Marc Smith
Cheech Wizard

Posts: 4367
From:West Chester, OH, USA
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posted 19 July 2001 03:49 PM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
You are 100% correct. I posted the link to that 'old dog' text for, as I noted, some ideas only.

I'm not a dedicated cal person. But if it was me, I'd do checks immediately. Once you clean it you've changed it. I agree with you, Ken. Your point is well made and appreciated.

Then I'd clean it and check again and go from there. Just as you suggest.

I again want to point out I am not a calibration professional - I do not work in a lab - this is only my opinion. The text I linked in Al's message above is ONLY for some ideas.

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Ryan Wilde
Forum Contributor

Posts: 34
From:Mineola, NY, USA
Registered: Feb 2001

posted 19 July 2001 08:37 PM     Click Here to See the Profile for Ryan Wilde   Click Here to Email Ryan Wilde     Edit/Delete Message   Reply w/Quote
Ken,

If the gage was used to check outgoing goods, and is filthy, I would call my quality manager to show him what people are using for acceptance testing. I would then note it, and clean it (not a thorough cleaning, but a good wipe-down that the person that uses the tool should ALREADY be doing).

Reasoning - Gage blocks are used to calibrate these items. Contaminants such as machine oil laced with metal shavings ruin gage blocks, and the water-based machining coolants rust blocks in under an hour. I would not allow a filthy tool near traceable calibration gauges. Or, possibly the budget for the $2500 gage block set could come from the outgoing inspection activity.

I would chase the problem from the other end, and find out why the people that use the tool do not feel it is necessary to keep it in useable condition.

Just my opinion,

Ryan

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Ken K
Forum Contributor

Posts: 47
From:Wisconsin, USA
Registered: Jun 2000

posted 20 July 2001 10:37 AM     Click Here to See the Profile for Ken K     Edit/Delete Message   Reply w/Quote
Point well taken Ryan. But what if the instrument is not filthy, but was dropped or knocked out of tolerance at some point before calibration? I still want to check calibration before anything else.
Afterall, the $2500.00 for gage blocks could be minute compared to what already went out the door.
The Firestone deal comes to mind.

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Ryan Wilde
Forum Contributor

Posts: 34
From:Mineola, NY, USA
Registered: Feb 2001

posted 20 July 2001 01:17 PM     Click Here to See the Profile for Ryan Wilde   Click Here to Email Ryan Wilde     Edit/Delete Message   Reply w/Quote
I agree with you Ken. Damage or out of tolerance conditions must be checked and documented prior to any adjustment.

But cleanliness is not a characteristic of the instrument, merely a preventive measure that should be performed often that does not affect the true accuracy of the instrument. I've been to companies that require instruments to be wiped clean before each use, and oddly enough, their instruments lasted much longer and held tolerance very nicely.

As far as the importance of cleanliness and checking outgoing product, how important is it if you are measuring the product with 0.003" of error added?

Ryan

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AviGeva
Lurker (<10 Posts)

Posts: 4
From:Ganey Tikva 55900, Israel
Registered: Apr 2000

posted 22 July 2001 02:05 AM     Click Here to See the Profile for AviGeva   Click Here to Email AviGeva     Edit/Delete Message   Reply w/Quote
Thank you all folks for the great help
Avi Geva

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