Interesting Discussion Using "Not A Calibrated Device" or "No Calibration Required" stickers

DAHSR

Registered Visitor
#1
What are the rules for using "Not A Calibrated Device" or "No Calibration Required" stickers? When would you use such a label? Would every tool that exists in your facility that is not calibrated required to be identified with a "Not A Calibrated Device" or "No Calibration Required" sticker?

In our Machine Shop we use wrenches, torque wrenches, pliers, files, screwdrivers, hammers, allen wrenches, socket wrenches, etc. Do these need to be identified with a "Not A Calibrated Device" or "No Calibration Required" sticker?
 
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Wesley Richardson

Wes R
Trusted Information Resource
#3
DAHSR said:
What are the rules for using "Not A Calibrated Device" or "No Calibration Required" stickers? When would you use such a label? Would every tool that exists in your facility that is not calibrated required to be identified with a "Not A Calibrated Device" or "No Calibration Required" sticker?

In our Machine Shop we use wrenches, torque wrenches, pliers, files, screwdrivers, hammers, allen wrenches, socket wrenches, etc. Do these need to be identified with a "Not A Calibrated Device" or "No Calibration Required" sticker?
No sticker would be required on items like wrenches, pliers, files, screwdrivers, hammers, allen wrenches, socket wrenches. These are not used to perform a measurement.

Calibration is required for torque wrenches, screwdrivers that have an adjustable torque value, feeler gauges, micrometers, calipers, steel scales, thread ring and thread plug gages, etc., if these affect the quality of your product.

For our clocks on the wall, I put a sticker "Calibration Not Required." However if that same clock is used to time a process, such as heat treating, then I would calibrate the clock, or provide a different means of timing for the operator, such as a calibrated stopwatch, calibrated chart recorder, etc.

Be cautious with the "Not Calibrated" and "Calibration Not Required" stickers, however. If you place this on a micrometer, and then it is used to measure a dimension on your product, it creates two problems. 1. It would be an audit deficiency if found, and more importantly, 2. if it is not calibrated, you really have no idea what that dimension actually is.

Wes R.
 

DAHSR

Registered Visitor
#4
CALIBRATION & TOOLS

The use of a torque wrench in this application is not used to measure, verify or record data, is not a customer requirement, does not affect product quality and is not used to accept or reject product. Does any of this matter? Does the fact that I have an "adjustable" tool within the four walls of my facility require that tool be calibrated or identified as not requiring calibration.

In the summary about wall clocks and a sticker "Calibration Not Required." Is every piece of time displaying equipment in your facility labeled with "Calibration Not Required" like the wall clock in the cafeteria or each employees wrist watch or your computer monitor display?
 

Hershal

Metrologist-Auditor
Trusted Information Resource
#5
Look at it logically (yeah, I know, that is outside the ISO realm at times).....the late Phil Stein phrased it best.....if the measurement matters, calibrate the equipment.....if the measurement does not matter, why make it?

Put another way, if you are making a measurement that matters to your device or product, calibrate the measuring device. If the measurement does not matter enough to calibrate the instrument, then why make the measurement at all? Now, use some common sense.....wooden rulers are an example of an item that should never be calibrated without some real specific reason.

As for NCR stickers, Wesley is right.....be careful with them.....use them only where you need them, not on things like pliers and hammers.

Hope this helps.

Hershal
 

Al Rosen

Leader
Super Moderator
#6
Hershal said:
Put another way, if you are making a measurement that matters to your device or product, calibrate the measuring device. If the measurement does not matter enough to calibrate the instrument, then why make the measurement at all? Now, use some common sense.....wooden rulers are an example of an item that should never be calibrated without some real specific reason.
That was the point I was trying to make in my first post, but my sarcasm was wasted.
 

Charles Wathen

Involved - Posts
#7
We have a Calibration Assessment form that is completed by the person requiring calibration. On this form, the Engineer has to answer some basic questions to help them determine if calibration is truly required or not, such as the logic that Hershal mentioned. If it's determined that calibration is not required, then we issue a Calibration Not Required label. If calibration is required, then we have to complete section B of our form that details the mfg's specs, our calibration ratio and measurement uncertainty, and a calibration procedure that has to be generated.
 
D

Dave Dunn

#8
Regarding items such as the hammers, pliers, etc., those wouldn't fall under calibration requirements as they are not measuring and test equipment, nor are the forces that they apply to products or tooling measurable or adjustable in application.

On the other hand, a torque wrench as mentioned, or for another example an adjustable air hammer might need to be calibrated, depending on the requirements of the process. It's not so much the type of tool, but the application that it's used for that dictates whether calibration is required. If a fastener simply needs to be fastened, use a screwdriver. If it needs to be fastened to a specific torque, use a calibrated torque screwdriver.
 

QChas

Involved - Posts
#9
Save the stickers!

In our tooling shop each toolmaker has his own gages. Rather then going to the expense of calibrating every tool, we identified a set of company tools used for accepting product. This way the toolmaker does what he has always done until he is "finished". Then he records the results with the company calibrated gages making note of the gage # used in the inspection. Our QMS states that "only gages with stickers on our master gage list require calibration". Saved a lot of money and kept everyone happy.
 
#10
QChas said:
In our tooling shop each toolmaker has his own gages. Rather then going to the expense of calibrating every tool, we identified a set of company tools used for accepting product. This way the toolmaker does what he has always done until he is "finished". Then he records the results with the company calibrated gages making note of the gage # used in the inspection. Our QMS states that "only gages with stickers on our master gage list require calibration". Saved a lot of money and kept everyone happy.
So when do the toolmakers' gages get calibrated? Is there a requirement for it? It's certainly possible to skirt the letter of the standard and use loopholes to avoid making good sense, but the fact is that gages need to be calibrated on a regular basis, regardless of who they belong to.
 
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