How to Properly Calibrate a Bore Gage

[marcez2]

I would like to know the appropriate way for claibrating bore gages..
Should I calibrate the whole component, with the bars, the anvils and everything..assembled..? Or can I calibrate only the dial gage..? I would be very grateful if someone can help me..Thanks so much..

 

[Jim Wynne]

Re: how to properly calibrate a bore gage?

I would like to know the appropriate way for claibrating bore gages..
Should I calibrate the whole component, with the bars, the anvils and everything..assembled..? Or can I calibrate only the dial gage..? I would be very grateful if someone can help me..Thanks so much..

If you're not sure about how to go about it, it's probably best to have it done by a qualified calibration lab.

 

[Wes Bucey]

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.

I agree! Plus, it may be time to check your definition of what YOU mean by "calibration" which you should compare with "certification" to NIST Standards.

Almost always, the mere fact one asks such a question is a strong indicator the person asking is not clear on what really needs to be done.

Most metrology experts would cringe in a manner similar to a brain surgeon cringing when someone asks what size hole saw to use to open a patient's skull.

 

[marcez2]

Re: How to properly calibrate a bore gage?

why?

We have saved lots of money by calibrating instruments inside..
I have temperature and humidity control, an analyst very well trained, good work instructions.., good masters , We are a machining factory, we have hundreds of different kinds of instruments therefore, we are really saving a lot of money, because several instruments are very easy to calibrate..

Anyway, I still have that doubt, because some people in the plant have complained to us..when they see that we disassemble the bore gage to calibrate it and we only calibrate the dial gage.I tell them that the accesories does not have any kind of identification, I mean, that there is no traceability, and because of that it is possible to interchange them with any dial indicator and in that way it is impossible to know if the calibration has been made with a specific group of accesories , that is the reason why I calibrate only the dial indicator.
But, I am very interested in knowing other opinions..I would be very grateful if you can help me with further information

 

[marcez2]

Re: How to properly calibrate a bore gage?

and anyone know how a certified calibration lab do it?....

 

[Miner]

Re: How to properly calibrate a bore gage?

If your company qualifies, you can join www.gidep.org and obtain calibration procedures.

 

[Ashwani]

Re: How to properly calibrate a bore gage?

I would like to know the appropriate way for claibrating bore gages..
Should I calibrate the whole component, with the bars, the anvils and everything..assembled..? Or can I calibrate only the dial gage..? I would be very grateful if someone can help me..Thanks so much..

hiiiiiiiiiii

i think you should concentrate on the IS for bore gauges related information.

we used to calibrate in assembled condition.
You can use a ring gauge for internal calibration.

If you have elctronic probes you may go for calibration with ring gauge using TIR method, but probe calibration is must in it.

Ring gauges for calibration you can get from good instrument manuf organization or prepare inhouse

just dont forget to get it hardened chrome plated to minimise the rate of wear.

one more thing if you calibrate it by ring matster gauge you need not get it calibrated from external lab if your master ring is calibrated from NABL / IEC 17025 accredated lab.

i will provide you in detail knowledge in a few hours as i am a bit busy

 

[marcez2]

At present I calibrate only the dial indicator with primary calibrated block gages..

If I calibrate the complete bore gage as you say with master rings I should have hundreds of different master rings..because I must calibrate in 0%, 25%, 50%, 75 % and 100% of the total range of the instrument and in that way you have lots of possibilities because each different accesory gives a differente range of measurement to the device, I cant imagine dealing with such a complexity..

anyones hasa procedure or work instruction?

 

[Miner]

At present I calibrate only the dial indicator with primary calibrated block gages..

If I calibrate the complete bore gage as you say with master rings I should have hundreds of different master rings..because I must calibrate in 0%, 25%, 50%, 75 % and 100% of the total range of the instrument and in that way you have lots of possibilities because each different accesory gives a differente range of measurement to the device, I cant imagine dealing with such a complexity..

anyones hasa procedure or work instruction?

Calibration should include the entire gage. So what if the dial indicator is calibrated. If the anvils are worn or damaged, the bore gage will have bias regardless of whether the dial indicator is calibrated or not.

 

[Ashwani]

At present I calibrate only the dial indicator with primary calibrated block gages..

If I calibrate the complete bore gage as you say with master rings I should have hundreds of different master rings..because I must calibrate in 0%, 25%, 50%, 75 % and 100% of the total range of the instrument and in that way you have lots of possibilities because each different accesory gives a differente range of measurement to the device, I cant imagine dealing with such a complexity..

anyones hasa procedure or work instruction?

if thats case

you can use the calibration setup's from different manufacturers like LVDT based etc.