Measurement Error - How to determine what is acceptable?

#1
Hello Everyone,

I need some guidance her,

In a gage R&R Study, what should be the Ratio of the Gage variation (Equipment Variation (%EV)) to the Parts variation (%PV)?

How can we say that the conducted Gage R&R Study is good,
1) If the variation of the Gage is High?
of
2) If the Variation of the Parts is high

Can Anyone Plese help me here.
Thank You.
 
Elsmar Forum Sponsor

Miner

Forum Moderator
Leader
Admin
#2
The typical guidance given is that the total R&R as a % of the study variation (%SV), the tolerance (%Tol), or process variation (%PV) is < 10% (ideal); 11 - 30% (may be acceptable depending on the application); > 30% (unacceptable).

If you are using the gauge for process control (i.e., SPC), use %PV (ideal if you have capability data) or %SV . Alternatively, use ndc (> 5).
If you are using the gauge for inspection to tolerance, use %Tol.
If you want to identify the major source of measurement error, use %contribution to focus improvement efforts.
 

Bev D

Heretical Statistician
Leader
Super Moderator
#3
If you are new to Gage R&R - then I suggest reading up on the topic as it - like so many things - is somewhat complicated. Both Miner and I have some good resources in the resources section of this site. You might also try reading some of Donald Wheeler’s articles (they are free at quality digest .com)
 
Thread starter Similar threads Forum Replies Date
Marc Definition MPEE - Maximum Permissible Error for Length Measurement Definitions, Acronyms, Abbreviations and Interpretations Listed Alphabetically 0
B Measurement Error on pure Graphite Coating on Tubes - To Error or Not to Error Using Minitab Software 7
S How to define Permissible Error for Measurement and Test Equipment? Measurement Uncertainty (MU) 3
bobdoering Dr. Wheeler on "How Measurement Error Affects the Four Ways We Use Data" Measurement Uncertainty (MU) 0
P Measurement Error Requirements - 99% or 99.73% spread to represent the 'full' spread? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 2
S Measurement Error When Measuring a Defect - Scratches Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 14
I Gage Error vs. Dimensional Tolerance - Accuracy needed for measurement equipment Measurement Uncertainty (MU) 10
M Maximum Permissible Error for Monitoring and Measurement Devices General Measurement Device and Calibration Topics 19
Z Definition Measurement Error - Precise definition of Measurement Error Definitions, Acronyms, Abbreviations and Interpretations Listed Alphabetically 1
P Type of MSA study according to measurement equipment Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 2
CaliperJim Temperature and Humidity Effects on Measurement Devices General Measurement Device and Calibration Topics 2
E Audit Finding - Measurement of Process - Continuous Improvement - Trend Analysis Oil and Gas Industry Standards and Regulations 22
Rene Minassian Control of (TMME) Testing and Measurement Equipment Oil and Gas Industry Standards and Regulations 2
R DIGITAL MEASUREMENT DEVICE Manufacturing and Related Processes 2
R First Time Managing Calibration and Measurement System. Need Help. General Measurement Device and Calibration Topics 19
J Not able to repeat measurement at the same location General Measurement Device and Calibration Topics 7
Ron Rompen Convert Linear Measurement to Angular Measurement General Measurement Device and Calibration Topics 3
Q Resolution of Measurement Device for a 50' Coil Reliability Analysis - Predictions, Testing and Standards 1
Ron Rompen Assistance with perpendicularity measurement Inspection, Prints (Drawings), Testing, Sampling and Related Topics 10
G QSB+ : capability of measurement equipment IATF 16949 - Automotive Quality Systems Standard 15
B Measurement Calculations vs ASME Y14.5 Various Other Specifications, Standards, and related Requirements 2
S Measurement of threaded holes ISO10578 or ASME standard Measurement Uncertainty (MU) 3
S Comparing measurement results for a part from two ring gage General Measurement Device and Calibration Topics 3
B Building my own measurement equipment General Measurement Device and Calibration Topics 3
P Test Method Validation (TMV) for all Measurement Methods in Rec/Inspection Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
J Keyence Measurement Systems General Measurement Device and Calibration Topics 3
Q Measurement Equipment Revocation - Looking for a Disposal Form with Risk Assessment IATF 16949 - Automotive Quality Systems Standard 10
C IVD Metrological traceability without a reference measurement procedure General Measurement Device and Calibration Topics 11
E Any template/ form of Monitoring and Measurement of Processes and product to ISO 13485? ISO 13485:2016 - Medical Device Quality Management Systems 1
A Flexible "Ring" Roundness Measurement General Measurement Device and Calibration Topics 2
M IATF 16949 SI # 10: Integrated self-calibration of measurement equipment- Needs for explanation IATF 16949 - Automotive Quality Systems Standard 2
I QMS monitoring, measurement, analysis and evaluation requirement - Template ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 9
F Physical Part Measurement General Measurement Device and Calibration Topics 6
M Measurement Uncertainty in Optical Microscopy Measurement Uncertainty (MU) 1
B ISO 6508 and portable hardness measurement instruments General Measurement Device and Calibration Topics 0
C How to Establish the Calibration & Measurement Capability (CMC)? ISO 17025 related Discussions 1
Ron Rompen Measurement of residual magnetism General Measurement Device and Calibration Topics 2
M Surgical angle measurement guide device with an application software Medical Device and FDA Regulations and Standards News 4
M Disabling measurement data during fault conditions IEC 60601 - Medical Electrical Equipment Safety Standards Series 5
J Most versatile measurement device General Measurement Device and Calibration Topics 2
P Surface scratch measurement General Measurement Device and Calibration Topics 1
N Drawing tolerance vs. Measurement device General Measurement Device and Calibration Topics 7
Ron Rompen MSA on automated measurement system - Multiple Step Vision System Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 3
P Thermo-Hygrometer - Measurement of 10DegC @10%RH ISO 17025 related Discussions 4
hogheavenfarm GDT Flatness measurement question Inspection, Prints (Drawings), Testing, Sampling and Related Topics 10
K Software Validation for Measurement Tools used in Process Validation ISO 13485:2016 - Medical Device Quality Management Systems 2
K Best Measurement Systems Demos in California? General Measurement Device and Calibration Topics 1
K Process Mapping - Inputs/Outputs/Detail Activities/Control points/Measurement? Process Maps, Process Mapping and Turtle Diagrams 4
B IEC 60601-2-10 - Accuracy of Pulse Parameters - Required Measurement Uncertainty IEC 60601 - Medical Electrical Equipment Safety Standards Series 3
N Program or application for standard time measurement in industry from video surveillance? Human Factors and Ergonomics in Engineering 1

Similar threads

Top Bottom