The Best Way to Calibrate Radius Gages

Jim Wynne

Staff member
Admin
#11
Well Jim,I am not aware,wheather CMM can be used in 2D also.I would definitely like to know the method of using CMM for 'Radius gage',and/or any other 2D profile.

Umang :bigwave:
Just set the gage in a holder such as a vise, tell the software that you're measuring a radius or circle and take several points along the radius in question.
 
Elsmar Forum Sponsor
U

Umang Vidyarthi

#12
Just set the gage in a holder such as a vise, tell the software that you're measuring a radius or circle and take several points along the radius in question.
Sounds intresting,theoriticaly(to me,I may be wrong).
Could you please demonstrate the method,or explain the exact process of calibrating a radius gage using CMM? :confused:

Umang
 
Last edited by a moderator:

Jim Wynne

Staff member
Admin
#13
Sounds intresting,theoriticaly(to me,I may be wrong).
Could you please demonstrate the method,or explain the exact process of calibrating a radius gage using CMM? :confused:

Umang
Do what I said earlier, then compare the result to the nominal size (and required tolerance) of the radius gage.
 
U

Umang Vidyarthi

#14
Do what I said earlier, then compare the result to the nominal size (and required tolerance) of the radius gage.
I am not able to comprehend what you are saying.
Could you please demonstrate the method,step by step,for calibrating a Radius gauge,using CMM.I would be greatful.

Umang
 

Jim Wynne

Staff member
Admin
#15
I am not able to comprehend what you are saying.
Could you please demonstrate the method,step by step,for calibrating a Radius gauge,using CMM.I would be greatful.
Do this:

Just set the gage in a holder such as a vise, tell the software that you're measuring a radius or circle and take several points along the radius in question.
I guess I should have finished that by saying, "Note the result."

Then this:

Do what I said earlier, then compare the result to the nominal size (and required tolerance) of the radius gage.
I don't know how else to explain it. Determine the actual size of the gage, then compare it to the nominal size, just as in any calibration process.

Added in edit: I think perhaps where you might be hung up is in the area of traceability, or the absence of a standard?
 
K

kat.k.

#16
Our standard for a radius gage is when new and a visual each day of use by the user of the gage.

We calibrate them with the Optical Comparator when they are new and from there on the user checks them for wear, nicks, bends etc.

The internal auditor doesn't know if we can get by with just a "visual" on a TS audit.

We have verified they are good for at least 10 years. Maybe the best thing to do is just throw them away after ten years of use. What do you guys think?

Thanks for your suggestions.
 
U

Umang Vidyarthi

#17
Do this:



I guess I should have finished that by saying, "Note the result."

Then this:



I don't know how else to explain it. Determine the actual size of the gage, then compare it to the nominal size, just as in any calibration process.

Added in edit: I think perhaps where you might be hung up is in the area of traceability, or the absence of a standard?
Got your point.Thanks.
Umang :thanks:
 
U

Umang Vidyarthi

#18
Our standard for a radius gage is when new and a visual each day of use by the user of the gage.

We calibrate them with the Optical Comparator when they are new and from there on the user checks them for wear, nicks, bends etc.

The internal auditor doesn't know if we can get by with just a "visual" on a TS audit.

We have verified they are good for at least 10 years. Maybe the best thing to do is just throw them away after ten years of use. What do you guys think?

Thanks for your suggestions.
Does the new one comes with a certificate?If yes,then that becomes your trceable standard.Otherwise,you may use templates(drawn and filled-in with black ink).Long back I have used thread profiles,supplied by the manufacturer.You may enquire from the manufacturer of radius gauges.

'Just a visual',in my opinion,may not suffice.Others on the cove may opine on this.I feel you should periodically compare the ones in use,against a new set of gages or templates.Periodicity will have to be determined on the basis of your own experience.Normally once in a year is enough,but in cases of high usage,you may increase the frequency or may shift the cycle from periodicity to number of usages.

For example,calibration frequency of thread plug gages in my factory,use to be annual.Due to consistent quality problem,it was reduced from one year to six months then to three months.For most of the gages 3M cycle is fine,but in 20% cases the problem persisted.So for these I changed the system to number of usage,and it is working fine.

Hope this helps

Umang :cool:
 
#19
Our standard for a radius gage is when new and a visual each day of use by the user of the gage.

We calibrate them with the Optical Comparator when they are new and from there on the user checks them for wear, nicks, bends etc.

The internal auditor doesn't know if we can get by with just a "visual" on a TS audit.

We have verified they are good for at least 10 years. Maybe the best thing to do is just throw them away after ten years of use. What do you guys think?

Thanks for your suggestions.
It seems to me as though you have got a reasonable approach here. What your internal auditor says has little bearing on the situation. Are they competent in this subject? If you perform enough optical verifications to build data, I'm sure a visual check, run a thumb nail around the profile etc. would suffice for a verification (not calibration) in between times. The use of radius gauges is not necessarily a very precise verification of a part anyway. I'd suggest that if it is, a quick trip to the cmm is likely to be more effective.
BTW - the first cmm's were only 2 D 'X' and 'Y' axis with no 'Z'. So they could be used to check a radius gauge.

Don't throw them away after 10 years. Put them on an optical projector or on the cmm and check them. I rather doubt they'll be off by much.......
 

BradM

Staff member
Admin
#20
Don't throw them away after 10 years. Put them on an optical projector or on the cmm and check them. I rather doubt they'll be off by much.......
Agreed. :agree1::yes:

My initial post on the subject had to deal with a totally different type of radius gauges. Namely, they were indicating-type meters that would ascertain the radius of different size material.

I am not familar with these more economical type instruments. Obviously the advice given on this seems to be fairly consistent, and a sound approach.

Like you Andy, I just can't bring myself to dispose of any instrument without taking some kind of readings first. Otherwise, it's possible to have been taking measurements with an instrument that contained error, but you would not know about it. As you stated, chances are they are not off, but you never know...
 
Thread starter Similar threads Forum Replies Date
S What is the best way to calibrate a Go NoGo Gauge Calibration General Measurement Device and Calibration Topics 2
A Gauges on pressure tank - What is the best way to calibrate a psi gauge internally? General Measurement Device and Calibration Topics 6
P DFMEA - Machinery Design Best Practices FMEA and Control Plans 0
G Best way to calc uncert for measuring microscope without duplicating repeatability? Measurement Uncertainty (MU) 2
William55401 Distributed By Product - Best Practices for Configuration Management and Purchasing Controls ISO 13485:2016 - Medical Device Quality Management Systems 0
P Best european location to set up for a virtual medical device manufacturer? EU Medical Device Regulations 4
optomist1 Best Optical Comparators General Measurement Device and Calibration Topics 9
qualprod Best practice to ensure inputting of data in production Lean in Manufacturing and Service Industries 19
M Best profilometer for the money General Measurement Device and Calibration Topics 22
P Best Global Option to become an OBL/PLM/Virtual medical device brand in 2020 Other Medical Device Regulations World-Wide 2
earl62 What is the best way to control special characteristics in Control plan? Is it Mandatory to have SPC for IATF 16949? IATF 16949 - Automotive Quality Systems Standard 12
J ISO 13485 System 'soft start' - How to best reflect this in initial audits, management review minutes and other records? ISO 13485:2016 - Medical Device Quality Management Systems 3
S What is the best method to bond urethane foam to urethane foam? Manufacturing and Related Processes 4
Watchcat Best Regulatory Oversight for Off-Shore Device Manufacturing? Other Medical Device Regulations World-Wide 1
E Best way to keep up with pharmaceutical quality knowledge and current affairs Service Industry Specific Topics 1
K Best Measurement Systems Demos in California? General Measurement Device and Calibration Topics 1
qualprod Best approach to get a real value as average? Statistical Analysis Tools, Techniques and SPC 6
CPhelan Best metrics for monitoring low volume (<1000) parts per vendors Supply Chain Security Management Systems 1
DuncanGibbons Best practice for identifying "items" of parts for DFMEA analysis AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 2
I What kind of wine best complements the Friday that you close out your external audit findings? Opinions are welcome. Coffee Break and Water Cooler Discussions 12
I Non-Conformance vs OFI -- your best descriptions ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 61
A What are Practical data center best practices IEC 27001 - Information Security Management Systems (ISMS) 1
G Best Practices for IT auditing - Is a session-id necessary for a complete audit trail? IEC 27001 - Information Security Management Systems (ISMS) 0
S Best software for customer support/complaints? Customer Complaints 0
R Bill of Materials for a complex product - Industry best practice ISO 13485:2016 - Medical Device Quality Management Systems 2
G Oversized Threads - What sized stab pin would be best to quickly check for oversized thread holes General Measurement Device and Calibration Topics 5
D What is the best software used for the pharma compliance management? Pharmaceuticals (21 CFR Part 210, 21 CFR Part 211 and related Regulations) 0
M Informational MHRA launches consultation on how to best engage patients and the public Medical Device and FDA Regulations and Standards News 0
optomist1 Mobility Field Manufacturing Best - Worst Practices Manufacturing and Related Processes 5
qualprod Best criteria to measure Corrective Action effectiveness - Poor Maintenance ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 10
N Best practices for capturing audit objective evidence in a practical manner? Internal Auditing 3
S How to Learn all aspects of ISO 27001:2013 | The best way to grab the knowledge on 27001:2013 (Step by Step) IEC 27001 - Information Security Management Systems (ISMS) 7
I Best visual description for SOPs? ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 18
Z Best Practices - small volume medical device tube cutting (0.020" to 0.080" OD)? Manufacturing and Related Processes 3
M Over-labelling - Any requirements or best-practices? Other Medical Device Regulations World-Wide 0
M Informational DITTA White Paper on Cybersecurity: Best Practices in the Medical Technology Manufacturing Environment Medical Device and FDA Regulations and Standards News 0
M Informational BSI – MDR Documentation Submissions Best Practices Guidelines Medical Device and FDA Regulations and Standards News 0
K Which clause would best fit this Nonconformance? (Supplier Related) Internal Auditing 2
P How to have employees buy-in of quality procedures. Best practices? ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 8
S Expiry date vs. Best Before Date - Reagents ISO 13485:2016 - Medical Device Quality Management Systems 9
C Will anyone please share training material for ISO:13485:2016 for best practices Training - Internal, External, Online and Distance Learning 0
E Best GD&T training - Your suggestions and recommendations please Training - Internal, External, Online and Distance Learning 3
M Best Practice for setting tolerances on a Drawing Inspection, Prints (Drawings), Testing, Sampling and Related Topics 8
M PCBA Drawing Best Practices IPC Class 3 ISO 13485:2016 - Medical Device Quality Management Systems 1
Ron Rompen Best Practices in CMM Correlation Studies General Measurement Device and Calibration Topics 3
B Best place is to purchase IEC 60417 labels that will pass markings test IEC 60601 - Medical Electrical Equipment Safety Standards Series 1
P Best approach to tackle difficult certifications Career and Occupation Discussions 2
E Best Ways to Close a Project APQP and PPAP 3
S Opinions on the "Best" CMM for High Accuracy Machining General Measurement Device and Calibration Topics 9
C What is the best ISO 22000 template pack to purchase? Food Safety - ISO 22000, HACCP (21 CFR 120) 2

Similar threads

Top Bottom