Can I calibrate Optical Comparators internally?

  • Thread starter Bob Gallinger - 2007
  • Start date
B

Bob Gallinger - 2007

#1
Do I have to get my opticals calibrated externally or can I not write good calibration proceedures and using my tracable gauge bloack etc. calibrate internally. I have 4-5 of them and I could save some money by calibrating them myself. Anyone have good writen procedures that could be shared ???
Thanks.
 
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Hershal

Metrologist-Auditor
Trusted Information Resource
#2
Re: Optical Comparators - Can I calibrate internally?

Of course you can calibrate internally, but I strongly suggest having an accredited cal lab calibrate them for you.

The idea of having metrology professionals do your calibration is the same as having an appropriately trained and qualified professional to inspect or program a CNC or occupy any other highly technical position.

Since you are in Canada then check this link to find a lab closest to you:

http://palcan.scc.ca/SpecsSearch/CalibrationSearchForm.do

Hope this helps.

Hershal
 
B

Bob Gallinger - 2007

#3
Re: Optical Comparators - Can I calibrate internally?

I understand that having external personal would be better but I have the standards and know how to measure accurately on an optical. If the optical fails my internal calibration then I'll call an external Lab to adjust, but 9 out-of 10 times the optical is fine but we pay just to have a cert. Somebody out here must calibrate/verify their own opticals internally.
Thanks
 
D

Duke Okes

#4
Re: Optical Comparators - Can I calibrate internally?

It's entirely your organization's decision whether to do internally or externally. As long as whoever does it has appropriate equipment, knowledge & skills, and calibration is traceable to an external standard that is acceptable.
 
J

jrubio

#5
Re: Optical Comparators - Can I calibrate internally?

It depends.

If you work in the Quality Anena, The calibration is "voluntary", only mandatory because your customer want it or because your proceddures call for them.


But if you are within a Security Arena Structure under industrial Laws you are not authorized to calibrate. Only notified Labs

This rules applies in Spain and Europe, not sure in USA.

:bonk: :bonk:
 

Ron Rompen

Trusted Information Resource
#6
Re: Optical Comparators - Can I calibrate internally?

Bob:

The short answer is yes.....there is no requirement (that I know of) that you must have an external 'expert' perform calibration of any of your equipment.

Depending on what brand of OC and software you have, the equipment used for calibration will vary significantly. If you have something like QC4000 or 5000, you want to be able to check a LOT of things (length, height, diameter, position, etc etc etc) for accuracy and (over time) stability. Mituotoyo now sells (not sure of the price) a calibration master that is VERY appropriate for calibration of OC's, or you can design one and have it manufactured for you by any decent tool shop/wire room.

Sorry I no longer have my procedure available to me, but I will see if I can dig up my draft copy, and will forward it on to you.
 
G

Grizz1345

#7
Re: Optical Comparators - Can I calibrate internally?

Bob

I do the calibrations on our optical comparators here. I use a glass scale and glass reticle for checking magnification. If I were to run into a problem I would not hesitate to call for outside help. My standards are NIST traceable and I have had no issues in any audit.

I have attempted to attach my procedure.

Hope all of this helps.
 

Attachments

J

jane_ackerman - 2010

#8
Re: Optical Comparators - Can I calibrate internally?

My question would be... what about angles?
With gage blocks you can build various lengths to check throughout the resolution of the gage... but you could only verify a 90 degree angle... not any minutes or seconds in between, nor any other various angles throughout the resolution.
 
B

Bob Gallinger - 2007

#9
Re: Optical Comparators - Can I calibrate Optical Comparators internally?

I'm well aware of angles and plan on purchasing/certifying angle blocks.
I still need to research on classes/standards of angle blocks.
Thanks for all your guys help.
 
J

jane_ackerman - 2010

#10
Re: Optical Comparators - Can I calibrate Optical Comparators internally?

Sorry if I am beating a dead horse here... but what would you use to certify your angle (and radius) gages besides an optical comparator?
 
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