Work Instruction to Calibrate or Verify a Combination Square

J

jcschwartz - 2009

#1
I was wondering if anyone could give me a work instruction for verifing a combination square. We use combo squares to check 90 degree angles and are spending a ton of money to get them calibrated outside. I want to do a verification in-house of all the tools that are verified and not calibrated. By this I mean tools that if found to be out of tolerance are thrown out since they cannot be changed. I can do the steel rule of the combo square but I do not know how to verify the 90 degree angle. We are a very small company but all of our shop guys have these squares. If someone could help that would be great.
 
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SteelMaiden

Super Moderator
Super Moderator
#2
Re: Calibrate or verify a combination square

What sort of resolution do you need? If you measure 3" on one leg of the square, 4" on the other, the Hypotonuse (sp??) will measure 5" (or any other unit of measure) I used to use this ratio for maintaining square in construction, we used feet instead of inches.
 

BradM

Staff member
Admin
#3
Re: Calibrate or verify a combination square

I was wondering if anyone could give me a work instruction for verifing a combination square. We use combo squares to check 90 degree angles and are spending a ton of money to get them calibrated outside. I want to do a verification in-house of all the tools that are verified and not calibrated. By this I mean tools that if found to be out of tolerance are thrown out since they cannot be changed. I can do the steel rule of the combo square but I do not know how to verify the 90 degree angle. We are a very small company but all of our shop guys have these squares. If someone could help that would be great.
Welcome to the Cove! Might I say you provided an excellent first post! It is really appreciated when relevant information is provided. Thanks!

What is the history on these squares? You may can extent the frequency. I would not see the 90 changing that often.

Are you paying for as found/ as left data? Could you get by without that information? Have you shopped around at competent labs to see if you can get a better deal?

Do you have any visual/comparator equipment? What kind of standards do you have in-place?

While this may be a cost you would prefer to avoid, in the end, it may benefit you sending them out to a qualified lab.

Just some thoughts.
 

Howard Lee

Trusted Information Resource
#5
Tape a piece of paper to a drafting table. Put the square on the straight edge of the table and draw a line on the paper. Reverse the square on the edge of the table and draw another line on top of or next to the first line. If the square is undamaged, the lines will be parallel.
 
#6
If you've got a shadowgraph/visual comparitor, throw it up on that and check it out. You're going to get an accuracy of 4:1 or better which is key to making any claims about 'calibration' of the square.
 

harry

Super Moderator
#7
Tape a piece of paper to a drafting table. Put the square on the straight edge of the table and draw a line on the paper. Reverse the square on the edge of the table and draw another line on top of or next to the first line. If the square is undamaged, the lines will be parallel.
I use this method but we termed it as verification and so far there are no problems from the auditors.
 
F

fireonce

#8
It depends the precision your require,you may verify the squares with a much preciser than your precision requirement.
 

Howard Lee

Trusted Information Resource
#9
I use this method but we termed it as verification and so far there are no problems from the auditors.
harry, it's been many years since I took geometry in high school, won't say how many, but I believe that this method can be tied to a "Proof" that we did in class. I would like to meet the auditor that would question the basic foundations of mathematics.
 

Howard Lee

Trusted Information Resource
#10
harry, it's been many years since I took geometry in high school, won't say how many, but I believe that this method can be tied to a "Proof" that we did in class. I would like to meet the auditor that would question the basic foundations of mathematics.
On second thought, maybe that wouldn't be so hard. Once upon a time I assisted an engineer that changed Pi in a line of program to make a measuring device work. Don't tell anyone, though, I was sworn to secrecy.:cool:
 
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