Is it possible to do a Gage R&R Study for a Pressure Gauge?

P

Piotr Stoklosa

#1
Hello,

Is it possible to do R&R Study for a pressure gauge?

The gauge is used for measurement of air pressure in car wheels. When apraiser checks for current pressure the wheel always loses a little of air so the pressure is going down. This means that measurement conditions are changing during succesive trials and the result will be meaningless.

How do you handle this situation?

Thanks,
Piotr
 
Elsmar Forum Sponsor

Miner

Forum Moderator
Staff member
Admin
#2
This is definitely a new twist on MSA's.

The following should work provided that your gage has adequate resolution to detect the changes in pressure.

Start by taking successive measurements, then plot them on an I-MR chart. Continue until the I-MR chart shows definite signs for trends, but the longer the better, preferably until the trend passes the control limits.

Using the same data perform a regression analysis of pressure versus test number. This will allow you to calculate a pressure drop per test value. It will be very important to have a High R-sqr(adj) on this because the error in this regression will become part of the measurement error. This is the reason for the I-MR test.

Perform the MSA in the standard method, but record the data in the sequence that it was taken. Apply the correction factor to each measurement using the regression equation, then enter the corrected values into the template/software and calculate R&R as normal.

Again, remember that the regression error will be part of the measurement system error, so do not cut corners on this part of it. Also, as in all regression analyses, the range of study must encompass the range of prediction. Do not attempt predicting results beyond the range of the data.

Let us know how this works.
 
P

Piotr Stoklosa

#3
Thank You for the answer. I'll try to use it.

A few comments on your proposition. I think another important thing will be to start all series of measurements from the same pressure value (loss of pressure is not the same for different pressures). This means that first thing I need is a validated pressure gauge which will help to "pump" the tire to right pressure.

But!,... this comment suggested me a new solution. What if before every measurement the tire will be pumped up again to known pressure value(everytime different, to cover whole variability range), using validated pressure gage with proper resolution (according to "1 to 10" rule of thoumb). Would it be right approach?

Best regards,

Piotr
 

Miner

Forum Moderator
Staff member
Admin
#4
I agree with your comment about starting the I-MR/regression study and the MSA study from the same starting pressure. Within the MSA study start each tire at the same starting pressure (within the normal process variation for pressure). Your point is valid, so the regression study will be more and more nonlinear as the range of pressure is increased. The plan should still work, but your correction factor will be different for each successive measure.

I think your second suggestion will add another variable to your study because each time you re-inflate the tire, you will be measuring what amounts to a new part. This would add the part variation into the repeatability and reproducibility numbers and inflate the R&R results.
 
Thread starter Similar threads Forum Replies Date
0 Is it possible to use a threaded ring gage to calibrate the M8 gage? Calibration and Metrology Software and Hardware 4
M Output of Nested MSA Gage R&R - Is this possible? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
R Is Gage R&R with measurement data possible in a Semiconductor Fab? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
J EC Certification transfer from CMO to Legal Manufacturer Possible? CE Marking (Conformité Européene) / CB Scheme 0
K Silver Plating corroding possible during SMT Manufacturing and Related Processes 10
K Is it possible to avoid the OQ? ISO 13485:2016 - Medical Device Quality Management Systems 20
G Special 510K possible? Only the packaging has changed Other US Medical Device Regulations 0
supadrai Possible to Submit a 510(k) if you have never, do not and cannot produce the device for which you're submitting the application? US Food and Drug Administration (FDA) 4
J Possible to get ISO 13485 certified with only OEM Product? ISO 13485:2016 - Medical Device Quality Management Systems 4
D Where does "as far as possible" stop? FMEA - EN 14971 ISO 14971 - Medical Device Risk Management 29
M Informational EU – Possible EUDAMED delay Medical Device and FDA Regulations and Standards News 3
M Is it possible to get iso 13485:2016 certified as a one man band ISO 13485:2016 - Medical Device Quality Management Systems 1
Ashok sunder Is it possible to reduce Risk likelihood and impact Post control Ranking after corrective action taken for risk? FMEA and Control Plans 1
dhuot1990 USP 41 Hanging Scale - Is it possible to make a hang scale adhere to USP41 Standards? ISO 17025 related Discussions 3
F Apple Watch is not a medical device. How can this be possible? CE Marking (Conformité Européene) / CB Scheme 1
qualprod ISO 9001:2015 Clause 8.3 - Is it possible to exclude one product but include it in other? ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 10
Ashok sunder Is it possible to reduce FMEA Occurrence and Detection Ranking after corrective action taken for customer complaints? FMEA and Control Plans 6
B Integrated management system - ISO 9001 and ISO 14001 - Is possible to have a joint certificate covering both standards? ISO 14001:2015 Specific Discussions 6
E Is it possible to start an ISO 9001 QMS from scratch (Really) ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 13
M Some possible misunderstandings on the application of ISO 13485 ISO 13485:2016 - Medical Device Quality Management Systems 10
P Is it possible to make an educated decision using a very very small sample size? Inspection, Prints (Drawings), Testing, Sampling and Related Topics 3
a_bardi Is it possible to exclude internal audit from qms scope? ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 5
G ISO 9001:2015 - Is control possible with Excel adaptable measurement sheets? ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 24
S Indications for Use - Is it possible to have a different indication for use EU Medical Device Regulations 1
C %GRR <10% not possible. How to get approval by auditor? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 15
I Is risk acceptability really needed if all risks must be reduced as far as possible? ISO 14971 - Medical Device Risk Management 6
M Is Automated Internal Auditing Possible? Internal Auditing 13
A Integrated Management Systems - ISO 50001 and ISO 9001 possible? ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 4
P Is it possible to receive EASA STC within 48 hours after modification? EASA and JAA Aviation Standards and Requirements 1
3 Israel: 1 Medical Device, Multiple Registrations = Possible? Other Medical Device Regulations World-Wide 3
Marc Yahoo probes possible huge data breach - BBC News - 2016 World News 1
Marc Yahoo probes possible huge data breach World News 0
S Preparing a Root Cause Report - Possible Root Causes Document Control Systems, Procedures, Forms and Templates 11
M Future of ISO 14971 - Possible revision? ISO 14971 - Medical Device Risk Management 9
M Is IEC 60601 compliance possible when only generic power-supply is specified? IEC 60601 - Medical Electrical Equipment Safety Standards Series 4
M Is it possible to have more than one authorized representative in Saudi Arabia? Other Medical Device Regulations World-Wide 6
Y Is it possible to check the authenticity of a CFDA registration certificate? China Medical Device Regulations 7
T Reduced Audit days when UPGRADING from AS9100 to TS16949 - Is it possible? IATF 16949 - Automotive Quality Systems Standard 2
Ajit Basrur Is Biocompatibility study performed on medical devices for possible contaminants? Other Medical Device Related Standards 4
B Subsidiary - No Managing Director - Is ISO 9001 Certification Possible? ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 3
R Is it possible to randomly select samples from 1 column to many column Using Minitab Software 2
Marc Google Fiber chooses nine metro areas for possible expansion After Work and Weekend Discussion Topics 1
Hershal ILAC is preparing to start the possible revision to ISO/IEC 17025 ISO 17025 related Discussions 2
A Is it possible for STC application before issue of TC ? EASA and JAA Aviation Standards and Requirements 4
B Is it possible that a virus sends spam on Facebook? After Work and Weekend Discussion Topics 6
Ronen E Incretin Mimetic Drugs for Type 2 Diabetes: Possible Increased Risk Pharmaceuticals (21 CFR Part 210, 21 CFR Part 211 and related Regulations) 0
R Is it possible for medical power supply to declare CE based on MDD? IEC 60601 - Medical Electrical Equipment Safety Standards Series 7
S Is it possible to have a General Change Control SOP and Form? Document Control Systems, Procedures, Forms and Templates 6
J Quality Management Process Model Possible Interactions and Effects ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 1
M Is it possible to have two QMSs? One for each or our two products EU Medical Device Regulations 9

Similar threads

Top Bottom