Gage R&R - What does the % tolerance says about my Gage

P

Philip

#1
Hi,

I am conducting a GR&R studies on my measuring equipment and the results are as follows:

The % tolerance is 31.11 and the number of distinct categories is 9.

Is this gage acceptable? What does the %tolerance tells us about this gage?
Please help.

Thanks.
 
Elsmar Forum Sponsor

Miner

Forum Moderator
Staff member
Admin
#2
Philip said:
Hi,

I am conducting a GR&R studies on my measuring equipment and the results are as follows:

The % tolerance is 31.11 and the number of distinct categories is 9.

Is this gage acceptable? What does the %tolerance tells us about this gage?
Please help.

Thanks.
The ndc = 9 says that the gage is good for process control, that is the gage can distinguish 9 distinct levels within the process variation.

The percent tolerance of 31.1% is just over the maximum of 30%. This means that the gage is marginally unacceptable for inspection purposes.

Now, a bigger question: To get an excellent ndc and bad P/T ratio can mean one of two things:
1) Your process variation is much greater than your tolerance (i.e., process is not capable). or
2) Your selection of parts for the study greatly exceeds the normal process variation, which inflated the ndc numbers. Your sample parts should reflect the spread of actual process variation.
 
Thread starter Similar threads Forum Replies Date
C Gage R&R @ 10% - Does that mean you should cut your tolerance Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 9
R What does the P/t ratio (Precision/Tolerance) =RR/(USL-LSL) say about my gage study? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 9
A Does Torque Gage Need Validation? Reliability Analysis - Predictions, Testing and Standards 4
A Does an attribute study (Go/NoGo pin gage) need two studies (1 for each pin) Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
M Does Validation = GR&R for a Go / No Go Gage IATF 16949 - Automotive Quality Systems Standard 3
S Does a CMM (Coordinate Measuring Machine) require Gage R & R study? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 9
T What does the Gage R&R results tell about my Accept/Reject Decisions? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 5
hogheavenfarm Does anyone know of a calibrated Fillet weld gage? General Measurement Device and Calibration Topics 12
P What does NO GO mean on a thread gage Inspection, Prints (Drawings), Testing, Sampling and Related Topics 23
C Does all gauges mean every gage? Manufacturing Engineering (Paragraph 7.6.2) IATF 16949 - Automotive Quality Systems Standard 10
Q An Engineer that does not understand gage R&R? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 17
C Gage R&R study definition - Results for GRR is .0005 - What does this number tell me? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 5
P Plug Gage Calibration Report does not include actual data - ISO 9001:2000 section 7.6 General Measurement Device and Calibration Topics 3
J Unilateral Gage R&R (GR&R) - Minitab 13 - Does this study pass or fail and WHY? Using Minitab Software 17
S Why Does a Thread Plug No Go Gage Mean Fail? Inspection, Prints (Drawings), Testing, Sampling and Related Topics 9
J AIAG MSA and Gage R&R - What does the Process Variation % R&R truly mean? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 11
J Gage R&R Software - Does anyone have experience using Mitutoyo's "MeasurLink"? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 5
D Does every company or employee owned gage have to be calibrated? General Measurement Device and Calibration Topics 2
A How does WIV (Within Part Variation) affect Gage R&R? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 9
T Plug Gage Calibration Calibration and Metrology Software and Hardware 1
L Gage R&R TMV Acceptance Criteria Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 4
S MSA for attribute relation gage Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 2
E Zero part to part variation - Gage R&R project Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 15
M Gage R&R and right way to measure Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 16
L Gage RandR on automated equipment. IATF 16949 - Automotive Quality Systems Standard 7
B Gage calibration frequency, ISO and IATF - What are the requirements Calibration Frequency (Interval) 3
D Difference between Test Method Validation and Gage R&R Qualification and Validation (including 21 CFR Part 11) 18
R Determining Uncertainty from Gage R&R Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
C Correct Calibration Method for Dial Depth Gage General Measurement Device and Calibration Topics 6
C Gage Block Wringing General Measurement Device and Calibration Topics 3
B Gage R&R with NDC=1 Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 19
S Type 1 Gage R&R or something else? Reliability Analysis - Predictions, Testing and Standards 6
G Should I perform Gage R&R only at the beginning of a new project? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 6
V Thread Plug Gage Pitch GO Diameter out of spec AQL - Acceptable Quality Level 8
G Gage R&R - Where am I going wrong? Part of a FAIR submission (Aerospace) Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 2
R Gage R&R Excel templates Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 3
K Gage R&R with more than 3 appraisers Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 2
Anerol C Gage R&R Template AIAG 4th Edition IATF 16949 - Automotive Quality Systems Standard 3
T Attributes SPC study - Attributive control (Go gage) Statistical Analysis Tools, Techniques and SPC 5
S Capability or Gage R&R Study for Leak Tester? Reliability Analysis - Predictions, Testing and Standards 15
N % Tolerance - Type 1 study on the gages, then a gage R&R (ANOVA) Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 4
M Definitive answer on Type 1 vs Type 2 vs Type 3 Gage Study Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 0
V Gage Management and Gage R&R Software General Measurement Device and Calibration Topics 1
D Gage R&R Study on Load Cells - Large chemical blending tanks IATF 16949 - Automotive Quality Systems Standard 1
B Minitab Type 1 Gage Study on True Position Question Measurement Uncertainty (MU) 1
S Gage R&R on alloy Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 10
8 Need Help - Runout - Function Gage Inspection, Prints (Drawings), Testing, Sampling and Related Topics 7
L Gage R&R studies for identical Devices - Need to confirm the requirement to perform them Reliability Analysis - Predictions, Testing and Standards 2
G Stab Pin Size For Check Gage Inspection, Prints (Drawings), Testing, Sampling and Related Topics 3
E Functional Gage for TOP applied at RFS Design and Development of Products and Processes 5

Similar threads

Top Bottom