How to Properly Calibrate a Bore Gage

J

jfgunn

#11
Questions for Bore Gages: What type of bore gage are you using? Does it have a three point measuring head or two? Does it have a removable dial indicator? Does it have setting rings with it?

The previous suggestion of GIDEP is a good one. They have a nice procedure that I would like to attach except that that would be a federal crime! If you have 1 military contract, go to www.gidep.org and sign up for free.

We are an accredited lab for bore gages. For a threee point measurment device, we specifically make a note on our accreditation scope that if the gage has a removable dial indicator, that we will remove it and just calibrate the indicator. We will then peform a function test of the bore mechanism and fixtures.

If the gage has two points, we will use an id stack of gage blocks and calibrate everything.

If the gage has setting rings, we calibrate those and use the rings to check the bore gage.



If the gage has setting rings, we will
 
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Miner

Forum Moderator
Staff member
Admin
#12
The previous suggestion of GIDEP is a good one. They have a nice procedure that I would like to attach except that that would be a federal crime! If you have 1 military contract, go to www.gidep.org and sign up for free.
Unless the rules changed, if you supplied to a company that supplied to the US government, you could join for free. This meant that any supplier of GM could join.
 
M

marcez2

#13
I would really like to know the opinion of some professional who works on a specialized lab..

Anyone there..?
Anyone has sent a bore gage to calibrate in a lab?
 

Stijloor

Staff member
Super Moderator
#14
I would really like to know the opinion of some professional who works on a specialized lab..

Anyone there..?
Anyone has sent a bore gage to calibrate in a lab?
Yes yes! We are here, and many of my Fellow Covers have tried to help you. :yes:

The most obvious response to your request would be: "Have you talked to the manufacturer of the bore gage?"

In addition, most equipment comes with operating- and calibration information/instructions.

Many organizations use these types of gages. Your best bet is, and just to make sure, is to go to the source.

Stijloor.
 

harry

Super Moderator
#15
I would really like to know the opinion of some professional who works on a specialized lab..

Anyone there..?
Anyone has sent a bore gage to calibrate in a lab?
......................We are an accredited lab for bore gages. For a three point measurment device, we specifically make a note on our accreditation scope that if the gage has a removable dial indicator, that we will remove it and just calibrate the indicator. We will then peform a function test of the bore mechanism and fixtures.

If the gage has two points, we will use an id stack of gage blocks and calibrate everything.

If the gage has setting rings, we calibrate those and use the rings to check the bore gage.
Have you missed the above response? It's from the Lab Manager of an accreditated lab for bore gages.
 
M

merrick65

#16
I would recogmend calibrating the indicator and then the bore gauge as whole system/unit. You could always put a tamper eseal on the gauge to verify the indicator hasn't been changed. We calibrate bore gauges with master ring gauges and also with a bore gauge calibration fixture (developed in house).
 
D

Dale D. Barnes

#17
People with more knowledge than I have answered but I will tell you how I accomplish the task.

I have many (close to 40) different size bore gages. I use Mahr Federal Maxum gages and Marposs E4 column with M1 Star handles. I have always calibrated my bore gages as one solid piece (yes they can be interchanged but no one but the gage lab is allowed to do that, so they would be re-calibrated).

My method of calibration was to certified NIST traceable gage blocks and certified Nist traceable parrallel bars. I would place the bars in a vice and stack the blocks to the correct minimum and maximum size and take readings on the bore gage. This was very time consuming so I started purchasing minimum rings and maximum rings (always have nominal rings with the gage). This made the process go a lot faster and in the long run saved money. Now that is not to 25%, 50%, 75%, and 100% of the tolerance but it allowed me to check nominal, min to that specific bore gage size, and max to the same size. I have never had an auditor find any problem with either method that I used. We are an automotive supplier and are audited to ISO and 17025 so I cannot speak on other areas of manufacturing but what I deal with daily.

Hopefully this will give you some idea what is possible. Another point is that the rings are calibrated to an outside source. I have the equipment to do the rings but it also is time consuming so I am still sending them out.

Dale
 
T

TamTom

#18
Questions for Bore Gages: What type of bore gage are you using? Does it have a three point measuring head or two? Does it have a removable dial indicator? Does it have setting rings with it?

The previous suggestion of GIDEP is a good one. They have a nice procedure that I would like to attach except that that would be a federal crime! If you have 1 military contract, go to www.gidep.org and sign up for free.

We are an accredited lab for bore gages. For a threee point measurment device, we specifically make a note on our accreditation scope that if the gage has a removable dial indicator, that we will remove it and just calibrate the indicator. We will then peform a function test of the bore mechanism and fixtures.

If the gage has two points, we will use an id stack of gage blocks and calibrate everything.

If the gage has setting rings, we calibrate those and use the rings to check the bore gage.



If the gage has setting rings, we will
Hello,

by lloking for a procedure for bore gauges i found your thread. At the moment I would like the just check the function point.

But I think we have to point gages, so hat to you mean by using gauge blocks? How do this ? Didn't I need rings?

I really would apriciate if you could be more specific.

Regards,

TamTom
 
B

bryan norris

#19
Re: how to properly calibrate a bore gage?

If you're not sure about how to go about it, it's probably best to have it done by a qualified calibration lab.
Can someone direct me to the correct ANSI/ASME standard referencing calibration of dial bore gages? It appears to have been B89.1.21 in 2012 but I am unable to locate this standard on the ANSI site. I am primarily interested in knowing if ASME requires that our calibration lab allow dial bore gages to acclimate to lab temperature for 24 hours prior to calibration/certification of the gage.
 

dwperron

Trusted Information Resource
#20
Re: how to properly calibrate a bore gage?

ANSI/ASME B89.1.21 is a draft standard, it has yet to be released.

The standard Air Force procedure (33K6-4-992-1) calls for an 8 hour soak time.
 
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