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Posted by Protagonist on August 1, 2006, 11:33 pm
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How frequently measuring tools need to be calibrated at the company?
Is there any guide line?
Company I work for calibrates every 6 months, mostly calipers and micro
meters. Told them, I think it's too much.
Once a year or two would be enough!
JS
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Posted by John on August 1, 2006, 11:55 pm
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Protagonist wrote:
>
> How frequently measuring tools need to be calibrated at the company?
> Is there any guide line?
> Company I work for calibrates every 6 months, mostly calipers and micro
> meters. Told them, I think it's too much.
> Once a year or two would be enough!
> JS
You start with a short calibration period and develop an error history
on each instrument. If the instrument holds calibration over the period
you bump up the period between calibrations until you reach the maximum
of one year or what is the max recommended by the mfgr. If the
instrument does not hold calibration, you throw it away or send it out
for repair.
John
John
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Posted by Tom Accuosti on August 2, 2006, 12:14 am
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| How frequently measuring tools need to be calibrated at the company?
| Is there any guide line?
| Company I work for calibrates every 6 months, mostly calipers and
| micro meters. Told them, I think it's too much.
| Once a year or two would be enough!
Are you working with ±.005? Then maybe that's okay.
If you're working with ±.0005, then it should be oftener. We calibrate
our stuff all the time, especially when starting jobs that might be
±.0002 or .0003. And then we make sure that the QC and the floor
instruments agree.
You know - measure twice, cut once, and all that.
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Posted by Protagonist on August 2, 2006, 7:11 am
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Tom Accuosti wrote:
> | How frequently measuring tools need to be calibrated at the company?
> | Is there any guide line?
> | Company I work for calibrates every 6 months, mostly calipers and
> | micro meters. Told them, I think it's too much.
> | Once a year or two would be enough!
>
> Are you working with ±.005? Then maybe that's okay.
> If you're working with ±.0005, then it should be oftener. We calibrate
> our stuff all the time, especially when starting jobs that might be
> ±.0002 or .0003. And then we make sure that the QC and the floor
> instruments agree.
>
> You know - measure twice, cut once, and all that.
>
>
>
My question is about official rules, like ISO9001 or some thing, not
what you think it should!
I own my tools and I know when they are out or needs to be replaced, if
they are bad!
Quality tools last!
JS
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Posted by Tom Accuosti on August 2, 2006, 4:32 pm
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| Tom Accuosti wrote:
| | | How frequently measuring tools need to be calibrated at the
| | | company? Is there any guide line?
| | | Company I work for calibrates every 6 months, mostly calipers and
| | | micro meters. Told them, I think it's too much.
| | | Once a year or two would be enough!
| |
| | Are you working with ±.005? Then maybe that's okay.
| | If you're working with ±.0005, then it should be oftener. We
| | calibrate our stuff all the time, especially when starting jobs
| | that might be ±.0002 or .0003. And then we make sure that the QC
| | and the floor instruments agree.
| |
| | You know - measure twice, cut once, and all that.
| |
| |
| |
| My question is about official rules, like ISO9001 or some thing, not
| what you think it should!
| I own my tools and I know when they are out or needs to be replaced,
| if they are bad!
We are in the middle of an AS9100 program, and I dont' remember anything
about a recommended frequency - although most of the standards are
open-ended enough so that you can make your own determinations as to the
frequency, again, depending upon the kind of work that you're doing.
Our optical comparators and several other larger pieces of equipment are
done annually. Most of our other stuff is done on an as-needed basis;
that is, when a job needs a certain micrometer, gauge, etc., it's
calibrated before it hits the floor and checked against the QC standard.
We may not need that piece for another 6 months or two years, so there's
no point calibrating it when we don't need it.
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> How frequently measuring tools need to be calibrated at the company?
> Is there any guide line?
> Company I work for calibrates every 6 months, mostly calipers and micro
> meters. Told them, I think it's too much.
> Once a year or two would be enough!
> JS