Acceptable Criteria for Variable Gage R&R according to the MSA Manual 3rd Edition

A

aproddutoor

#1
#1
The Acceptable Criteria for Variable Gage R&R study according to the MSA Manual 3rd Edition for %Study Variation and %Tolerance is:

< 10% - The measurement system is acceptable

between 10% and 30% - The measurement system is acceptable depending on the application, the cost of the measuring device, cost of repair, or other factors

>30% - The measurement system is unacceptable and should be improved

Everybody says MSA is the Standard that is used for the Gage R&R's but I want to know whether there is any reasoning behind the Acceptable Criteria. How did MSA come up with such numbers?

Thanks
 
SQCpack - Communicate Quality Metrics
Elsmar Forum Sponsor
Bev D

Bev D

Heretical Statistician
Leader
Super Moderator
#2
#2
Re: Acceptable Criteria for Variable Gage R&R

you quote the "standard" for the automotive industry - it is not the standard for everyone or every industry. Miner is probably the best source for the history. But there is really no substantial reason for using 10, 20 adn 30. These were in all liklihood anatomically derived. I refer you to Wheeler's work and the many posts here on this topic.
 
A

adamsjm

#4
#4
While I tend to agree with Bev D. that “… there is really no substantial reason for using 10, 20 and 30%”, there are some reasons these values are sited. It mostly deals with the ability to pass the Gage R&R vs. Cpk correlation.

A good reference source on this is RESOLVING DILEMMAS THAT OCCUR WHEN USING QUALITY MEASURES by Karl D. Majeske and Richard W. Andrews

http://deepblue.lib.umich.edu/bitstream/2027.42/35878/2/b2035029.0001.001.pdf

They state, “Automobile manufacturers and suppliers that follow Automobile Industries Action Group (1995) guidelines use a cutoff of Co = 1.67, i.e., processes with Cp >1.67 are approved for production.”

With this condition a capability of Cpk > 1.67, Gage R&R most likely must be less than 30% to be confident of the process capability. With a condition of capability, Cpk > 2.00, Gage R&R most likely must be less than 10% to be confident of the capability. The confidence that the process is that capable is more complicated but these are some guidelines.

Per Majeske and Andrews, “… Therefore, the more capable a process, the more precise a gage must be to pass the correlation criteria (i.e.: Gage R&R vs. Cpk).”
 
You must log in or register to reply here.
Thread starter Similar threads Forum Replies Date
M What is maximum limit for MU (Measurement Uncertainty) or acceptable criteria? Measurement Uncertainty (MU) 5
M Accuracy Criteria - Published material related to acceptable accuracy criteria General Measurement Device and Calibration Topics 5
P Acceptable quantity levels/Sigma levels for reducing the frequency of quality tests. Six Sigma 7
R Using RPN to Confirm Risk Reduced to an Acceptable Level Risk Management Principles and Generic Guidelines 12
Eva lee Which is the range for the validated batch size(for example ±5%, 10%) is acceptable? Manufacturing and Related Processes 8
S Examples of FDA acceptable Software Design Specification (SDS) Medical Device and FDA Regulations and Standards News 6
Q Acceptable Tolerance - how to derive? Measurement Uncertainty (MU) 16
W Misinterpretation of requirement acceptable as root cause? Problem Solving, Root Cause Fault and Failure Analysis 19
J Standard used to determine if check fixture gauge is acceptable Reliability Analysis - Predictions, Testing and Standards 2
M Measurement Error - How to determine what is acceptable? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 3
M Are Fungal counts acceptable in class 1000 clean rooms? Other ISO and International Standards and European Regulations 2
T ISO 14971-2019 doubt - Evaluate if estimated risks are acceptable ISO 14971 - Medical Device Risk Management 9
samer Acceptable limits for Spills - Tracking Hydraulic Spills ISO 14001:2015 Specific Discussions 3
V Acceptable maximum RSD (relative standard deviation) for an sample size Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
B Gage R&R Acceptable (10-30%), deduct Total Variation from Tolerance Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 12
Q Acceptable calibration accuracy of a 60" linear measuring device General Measurement Device and Calibration Topics 16
F It is acceptable moving remote locations staff to manufacturing plant for auditing? IATF 16949 - Automotive Quality Systems Standard 3
Q Is it acceptable to mix components from two different lots into an assembly? ISO 13485:2016 - Medical Device Quality Management Systems 1
C Acceptable NDC for %GR&R part inspection to Tolerance (%Tolerance) Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 3
D Risk Register - have we considered enough and is the format acceptable? ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 8
K Operator Checks - How to show that they were completed on a checklist as acceptable IATF 16949 - Automotive Quality Systems Standard 2
C Example Work Instruction/Procedure for AQL (Acceptable Quality Level) AQL - Acceptable Quality Level 4
S Dates on Labels acceptable to the USA - GS1 General Specification 3.4.4 Other US Medical Device Regulations 3
E Root Cause Analysis - Is Insufficient Understanding an acceptable Root Cause? General Auditing Discussions 9
W Unattached (stand-alone) Forms acceptable for AS9100C? AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 7
V Why Gauge R&R 10% is acceptable for variable instruments ? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 5
X Acceptable methods to store and archive records ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 7
M Is it acceptable to audit to the Nuclear Principles? Quality Manager and Management Related Issues 9
I Is it acceptable it is to list new products under an existing 510(k)? Other US Medical Device Regulations 14
S If this EN ISO 11137 certificate acceptable for Contract Sterilization? ISO 13485:2016 - Medical Device Quality Management Systems 2
D What is satisfactory & acceptable for Coliform - Staphylococcus - Hands and Surfaces Food Safety - ISO 22000, HACCP (21 CFR 120) 3
S Is a Dynamic Controlled Form acceptable per 21CFR820 Document Control Systems, Procedures, Forms and Templates 3
C Lowest Acceptable Grade for Master Gage Set Calibration and Metrology Software and Hardware 1
B Digital Signature Solutions acceptable to use in an FDA Medical Device Environment 21 CFR Part 820 - US FDA Quality System Regulations (QSR) 4
J Is a ndc less than five is also acceptable? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 6
T Technical regulations that determine the acceptable limits of cigarettes General Measurement Device and Calibration Topics 4
L IEC 60601-1 3rd edition Clause 9.2.2 Trapping Zone (Acceptable Gaps) IEC 60601 - Medical Electrical Equipment Safety Standards Series 5
N Is it acceptable to sterilize products without claiming and labeling "sterile" ? ISO 13485:2016 - Medical Device Quality Management Systems 6
M Quality Objectives - Acceptable Levels and Functions ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 37
C What is an acceptable bioburden level or count when working in cleanroom ISO class7 ISO 13485:2016 - Medical Device Quality Management Systems 1
D Is embedding documents within a Contract an acceptable practice ? Contract Review Process 9
B Non Acceptable % Tolerance Result - Decrease Sorting Limits Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 3
F ANSI ASQ Z1.4 - Is the following process acceptable? Inspection, Prints (Drawings), Testing, Sampling and Related Topics 4
C Maximum acceptable Tolerance - Uncertainty Ratio (TUR) General Measurement Device and Calibration Topics 2
S Is it acceptable to have an ASL for Critical suppliers alone? Supplier Quality Assurance and other Supplier Issues 4
S Is this Quality Policy acceptable in the context of ISO 13485? ISO 13485:2016 - Medical Device Quality Management Systems 24
A Help with acceptable screw gage values per standard BS 919 for Go/ No Go gage General Measurement Device and Calibration Topics 4
S What are typical Acceptable Quality Levels (AQL) adopted in Food industry? Food Safety - ISO 22000, HACCP (21 CFR 120) 1
somashekar Who can provide a WHO GMP certificate in India acceptable to the CDSCO Other Medical Device Regulations World-Wide 6
D Root Cause and Corrective Action - Is our Practice Acceptable? ISO 13485:2016 - Medical Device Quality Management Systems 5

Similar threads

Top Bottom