What Measurement, Monitoring and Test Equipment Must Be Calibrated?

M

Martine

#1
Calibration or not ?

The company I work for is a machine building plant that has its own research and development, engineering and design, as well as workshops for the production of machinery, which are all used in the fastener manufacturing industry.

At the moment there is a discussing about which measuring instruments ought to be calibrated and which not.
The head of our assembly department states that the instruments used in his department are only used to “compare” two parts with each other (to see if they fit), and therefore should not be calibrated.
On the other hand, the instruments used in our workshop (we also produce our own parts) are used to check the dimensions of a part in production against the one mentioned on its drawing. So, these instruments should definitely be calibrated.
Could you please give me your opinion ?

Also, would it be profitable to do the calibrations in-house ?
Can anyone give an estimate of the costs involved (we have approximately 1500 instruments in use) ?

Thank you in advance.
 
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Jerry Eldred

Forum Moderator
Super Moderator
#2
I think a good, very simple definition of when to calibrate is if you care whether the instrument is correct. If you don't care whether the instrument is correct, then you MAY not need to calibrate. If this is a QS9000 plant, there are another more complicated set of answers. Please tell me if you are QS9000 or ISO9000 and we can address that question separately.

As for the cost to calibrate, that is a complicated question. If you only have calipers and micrometers, you may find it is not too costly. But if you have many different types of instruments, you will have to do a cost evaluation. There are a number of factors to be considered. You will need a properly trained person to do the calibrations. You will need a written policy and written procedures. You will need proper equipment to do the calibrations, and need to maintain proper externally done calibrations on all of those. If your instruments are pretty simple, all of the above is probably pretty simple, and not too costly. If you have many highly accurate instruments that measure many different types of parameters, it may be questionable as to whether you choose to calibrate in-house. If you can post a set of how many, and what type instruments you have, I can give you a little better idea as to whether or not to calibrate.

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J

Jim Biz

#3
We support the view that "Fit-up gages" (such as matching assembly parts) - should be handeled as - for reference fitup only - BUT we included clarification statments in our doc's allowing this to be done - by authority of our qualified head inspector... and included a work instruction on how to evaluate - fit-up gaging prior to each use.

TECHNICALLY they aren't "CALIBRATED" to a standard - identified - entered into the report history records - but each are evaluated and verified to our internally set tolerance ranges prior to being used.

All other gaging insturments that are used "to qualify products are part of the calibration system".
 
B

Bill Ray

#4
Calibration can be a reasonable insurance at a reasonable cost. The overall cost to calibrate 1500 instruments, assuming general inspection calipers, micrometers, torque, pressure, gage blocks, pin sets, etc. should be about $15,000 US$. However, if you do not have the calibration equipment, the most economical way is to subcontract to a general calibration service. Otherwise, you will have the supermicrometer cost, the cost of developing procedures, and the cost of calibration equipment maintenance and calibration.

Reasonabl insurance, if done in the most efficient manner. Costly, if not.

Bill Ray
 
L

louie

#5
Jerry,(and anybody else !)

We are seeking T&E Certification and would like your interpretation on our requirements for calibration.

Presently we are tagging / id'ing all employee owned tooling as "reference only" and only calibrating company owned tooling. We are trying to establish intervals for calibrating tooling.

Presently I have no way of knowing when / where any tool is used as there is no traceability to any prints / machines that we build to any tooling used to verify measurements, other than my CMM machines.

I think this is too loose - your thoughts?
 
M

Martine

#6
Jerry, Jim, Bill,
Thanks for your quick responses.

Jerry, to answer your first question, the company is ISO9001.
As for the different types of instruments, I will try to give you an estimate of what we have:
+/- 100 clock gages (external, internal, depth), +/- 500 micrometers (of all sorts: inside, outside, depth, 2-points, 3-points, digital, with build-in clock gage, blade, thickness, screw thread, tubular inside, disc), +/- 350 calipers (of all sorts: analog, digital, inside, depth), 2 surface plates, 41 pocket test indicators, +/- 20 gage block sets, 15 height gages, 25 graphometers, 12 torque wrenches, and some other instruments of which I don’t know the proper translation.

Two years ago, we send away a part of our instruments to a general calibration service. Using the cost of this calibration as a basis, we estimate the overall cost to calibrate all of our instruments at about $33,000 US.
Since we do not have any calibration equipment, or the personnel to do the calibrations, we wonder if it would be worth trying in-house calibration.

Any response still greatly appreciated.
 

Jerry Eldred

Forum Moderator
Super Moderator
#7
Martine - I will have to apologize that I am on vacation in COOL green Vermont until next Monday. I WILL give you an answer. I have a slow connection from a house up in the mountains, so I have to restrict myself to brief answers. I don't think I will do you justice until I am back in the office next week. Briefly though, it looks as though you have a mixed bag. A lot of what you have looks as though it very well be worth your while to calibrate in house (calipers and micrometers most certainly). The others, let me tackle next week in better detail.

Louie - Yes, I agree that is too loose. There should be little differentiation between company owned and personally owned measuring instruments. If they can easily be interchangably used, it is dangerous territory to leave one uncal'd and the other cal'd/. As above with Martine, more detail next week.



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Marc

Hunkered Down for the Duration
Staff member
Admin
#8
Originally posted by louie:

We are trying to establish intervals for calibrating tooling.

Presently I have no way of knowing when / where any tool is used as there is no traceability to any prints / machines that we build to any tooling used to verify measurements, other than my CMM machines.
Do you have any past calibration data? Take a look through and see how the cals went. Was the tool in cal? How much adjustment was made (if any)? Etc. You can use past data to justify intervals.
 
M

M Trammell

#9
Calibration of all "Gauges"

We were recently audited for TS16949 and the auditor stated that we must calibrate all guages on our equipment. This seems a little far fetched to me as most of them are for reference of things like Air pressure, water pressure, gas pressure and the like. I can understand calibration of "Gauges" that are used to measure the product but what is with calibration of "All Gauges"?

:thanks:
 
M

mshell

#10
I believe that you can identify those items used for a reference as "reference tools" and indicate that calibration is not required.
 
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