Safeguarding Calibration on Digital Equipment

A

aamoroso

#21
If an operator inadvertantly sets the zero on his calipers and makes bad product that goes unoticed until the next operation or worse shipped to a customer our NCP procedure would activate an investigation. If it could be determined that the operator used the instrument incorrectly, the corrective action procedure would kick in and the corrective action would state training in proper use of measuring instruments is required.

I would never say that Starret tools or Brown & Sharpe or any others make a product which is faulty or not acceptable. To remove adjustability from a measuring tool you would have to have solid measuring for everything you measure. There is nothing stopping someone from using a tool incorrectly other than training. If your operators do not understand how to use a pair of calipers properly train them or take the calipers away.
 
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Jim Wynne

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#22
aamoroso said:
...the corrective action procedure would kick in and the corrective action would state training in proper use of measuring instruments is required.
But you would probably have a job description that would include the need for the operator to be able to use the tools of the trade, no? So maybe the root cause goes a bit deeper.
 
A

aamoroso

#23
JSW05 said:
But you would probably have a job description that would include the need for the operator to be able to use the tools of the trade, no? So maybe the root cause goes a bit deeper.
Absolutley JSW05,

If you go back into my previous posts, I have preached that proper training is safeguarding against bad adjustments of the calipers. :agree1:
 
#24
Hehe - here is my 2 cents since I've been calibrating mechanical tools since 1975:

There is a difference between mechanical and electronic gages. In the mechanical world, we have a mechanical zero that is typically set at 3 points on a vernier micrometer for example. Once we have these 3 zero points set, we can then begin calibration. Once the vernier gage is calibrated and leaves our lab, the operators will usually call us to verify the gage since it no longer indicates a mechanical zero (they do not have the wrench necessary to make changes on the barrel). Usually the deviation from zero is the result of debris on the anvil surfaces. Once we show the operators that they need to wipe the anvils to check, they can see that the zero returns to it's original position. This mechanical zero remains accurate as long as the micrometer is not dropped or used as a C-clamp. This is the way it was 15-20 years ago.

Today with digital gages, you are no longer setting a mechanical zero, but instead a electronic one that can be set anywhere on the gage. We no longer get calls to verify gages because it's done by the operator, who might rezero the gage with debris on the anvils; thus, preventing an accurate measurement. I agree that training plays a very important part, but I guess I'm from the old school - I trust the ability of mechanical gages more readily than electronic.
 
R

Ryan Wilde

#25
Jeff Frost said:
JSW05

Gee and all the years I have been using a ASME recognized term Gauge which is an instrument for measuring, testing, or registering pressure above atmospheric pressure and its incorrect English.

You would thank that when an organization like ASME who wrote a pressure gauge, oops gage standard B40.1 would only use those terms recognized in a Quality Dictionary.

Boy that causes my Hysteresis to have a big error, oops can't find Hysteresis in Quality Dictionary. Now what do I.....

Jeff
Gauge, as in Gauge Pressure (psig) is referenced to atmospheric pressure. It is the most common type of pressure gauge, as opposed to an Absolute Pressure Gauge (psia), which is referenced to absolute zero (a perfect vacuum).

Now, none of this has anything to do with whether someone spells the measuring device Gauge or Gage. Gage is simply a commonly used variant spelling of gauge, which is the proper term. It is akin to spelling through as thru - technically it is incorrect, but so common that it is the norm (in the USA that is).
 
J

jane_ackerman - 2010

#26
Safe Guard Integrity

At a previous company that I worked for, we applied sealing wax to the gib stop screws on calipers. If the gib stop screws work loose and allow the gib to move, this can affect the accuracy of the gage.
Another example of this is with snap gages. After the dimension is set, some kind of sealer should be put on the adjustment screws so they don't come loose and allow the anvils to move.
For mics, you may want to plug the thimble adjustment hole and remove the little tool (from operator access) that is used for making that adjustment.
Just some food for thought.
~Jane
 
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