Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Gage Calibration

Gage Calibration

Gage Calibration

During our last ISO Audit, our Auditor cited us because we did not have our Squares, calibrated.  Employees use these to monitor the angle of the parts after forming or bending.  I have always used the rule if you are making a decision about the part based on the measurement you are taking then it should be calibrated. However I have lots of squares on the shop floor and would take months to calibrate all of them.  What are some ways the rest of you handle this.

RE: Gage Calibration

I have been a quality consultant for years developing automotive supplier and then ISO/TS systems.

The 3rd party auditing firm was correct. Each of the squares on the shop floor must be in your gauge log and confirmed and I would suggest yearly. That should not be a big cost factor then.

Here is how I would do it.

Have 1 square confirmed by an outside calibration firm and retain the certificate on that square. It will now be the master square in your plant and not used for anything else except for calibration purposes.

The remaining squares will be confirmed using the master. If one sees light through the squares as the kiss back to back, then the shop floor square must be replaced.

Remember, place both the master and the square on the granite table. Push them together so that the vertical squares are touching each other. Look for light.

3rd party auditing firms cannot tell a company how to confirm the calibration so perform it in the easiest, most effient way possible.

Hope this helps.

Dave D.

RE: Gage Calibration

What square are you referring to, machinist, inspection, etc?

RE: Gage Calibration

I think I got a good Idea as to what I need to do.  These are mostly machinist squares that our operators are using to monitor the bends on their parts as they are running.

RE: Gage Calibration

We had some trouble with machinist squares getting a setup to check the angles. As I recall it was three points required for calibration. One thing that bugged us was the scale used in square. We had sveral where the scale had been changed out and it didn't match the original equipment scale.
We used a cylindrical square checker on a granite table to check all inspection squares, which were just as good as the standard.  

One interesting point is they were going to include the carpenter squares used by the fab shop until they put a couple on the table to check. They gave up real quick as nearly all were Al.

RE: Gage Calibration

I have seen a dual system utilized where if a tool is not being used for obtaining quality data or to actively control/adjust a process it gets labeled as "reference only, calibration not required".  

Since you indicate that part decisions are based on measurements taken, such a system is likely inappropriate.  I agree with the previous posters that you should use as simple a calibration process as is effective for product control.


Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close