08 msa grr example 1

7/28/2019 08 Msa Grr Example 1

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USE OF GRR DATASHEET AND REPORT

1) Refer to AIAG MSA manual for detailed information on conducting Gauge R&R's.2) Add reference information to cells highlighted in light yellow:3) Enter Operator names on "Datasheet" sheet.4) Add Enter test results on "Datasheet" sheet to all cells highlighted in gold:

Note: Sample data is only required for the number of samples and trials actually run - If no test was made, leave field blank. Do not enter a 0 value.5) Enter header fields on "Report" sheet. "Total Tolerance" field must be filled in order to calculate %'s.6) Results consist of the sheets labeled "Report", "Graphs" & " Gage Performance Curve". I recommend

adding pertinent information to the header/footer as needed before printing.7) The hidden sheet labeled "Graph Worksheet" is used to format the results in order to generate the graphs.

Any changes to this sheet WILL result in incorrect graphs.

USE OF GAUGE PERFORMANCE CURVE1) Tolerances must be entered on the GRR Report for USL & LSL.2) If the curves are drawn in the negative Y direction, the USL and LSL entries may be reversed.

A s s u m p t i o n s : The fo l lowing assumpt ions have been made dur ing the deve lopment o f th i s worksh ee t. To ensure the p roper ca lcu la tions have been made , i t i s impor tan t tha t a min imum of two o pera to r s a re used in the s tud y and that the data for these operators are entered in sect ions A & B . Sect ion C is checked for entr ies when averages are calculated. I f sect ion C is used withou t comp let ing sect ions A & B, the average

ca lcu la tion wi l l be incor rec t . The same log ic ho lds fo r the Tr i a ls . A min imum of two t r i a ls mus t be com pleted and the co lumn s for Trial 1 & 2 f i lled. I f Trial 3 is f i lled withou t entr ies in Trial 1 & 2,the average calculat ion wil l be incorrect .

Th e Total Tolerance cel l in the Report sheet must be entered as the tolerance band w idth (i.e., a toleran ce of +/- 3, mus t be entered as 6)

Interpreting the Results: Referendc (Number of distinct categories should be >= 5, pg. 117%GRR Under 10% generally considered to be an acceptable measurement pg. 77

10% to 30% - may be acceptable based upon importance of application, cost of measurement system, cost of repair, etc pg. 77Over 30% - considered to be not acceptable - every effort should be made to improve the measurement system pg. 77

Repeatability > Reproducibility (large factor)The instrument needs maintenance pg. 123


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pg

Part No. & Name Gage Name

Part Characteristic Gage Make

Total Tolerance 2.55 Scale uA Gage Model

USL 2.28 LSL -0.27 Gage resolution: 0.06

From Data Sheet: R = 0.01422867 FALSE 0.049

MEASUREMENT UNIT ANALYSIS % TOLERANCE ANALYSIS 1 % STUD(for Product Control Decisions) (for Process Control D

% EV = 100[(EV)/(TOLERANCE)] % EV = 1

StdDev 6 * StdDevEV = 0.01260944 0.0756567 % EV = 2.97% % EV =

% AV = 100[(AV)/(TOLERANCE)] % AV = 1

StdDev 6 * StdDev AV= 0.02536267 0.152176 % AV = 5.97% % AV =

P/T Ratio = 100[(R&R)/(TOLERANCE)] % GRR = 10

StdDev 6 * StdDevGRR = 0.02832425 0.1699455 P/T Ratio = 6.66% % GRR =

PART VARIATION (PV) % PV = 100[(PV)/(TOLERANCE)] % PV = 10

Gauge Repeatability and Reproducibility Report

REPEATABILITY AND REPRODUCIBILITY (R&R)

REPRODUCIBILITY - APPRAISER VARIATION (AV)

REPEATABILITY - EQUIPMENT VARIATION (EV)

WARNING: Measurement Units do n

LT1101


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GAGE REPEATABILITY AND REPRODUCIBILITY DATA SHEET (Long Method)

1 2 3 4 5 6 7 8 9 10 11

Operator

Sample # 1st Trial 2nd Trial 3rd Trial Range 1st Trial 2nd Trial 3rd Trial Range 1st Trial 2nd Trial 3rd Trial Range1 -0.06098 -0.06098 0 0.00000 0.00000 0 -0.06098 -0.06098

2 -0.06098 -0.06098 0 0.00000 0.00000 0 -0.06098 -0.06098

3 -0.06098 -0.06098 0 0.00000 0.00000 0 0.00000 -0.06098 0.06

4 0.00000 -0.06098 0.06098 0.00000 0.00000 0 -0.06098 -0.06098 0

5 -0.06098 0.00000 0.06098 0.00000 -0.06098 0.06098 -0.06098 -0.06098 0

6 -0.06098 -0.06098 0 0.00000 0.00000 0 -0.06098 -0.06098

7 -0.06098 -0.06098 0 -0.06098 0.00000 0.06098 -0.06098 -0.06098 08 -0.06098 -0.06098 0 0.00000 -0.06098 0.06098 -0.06098 -0.06098 0

9 -0.06098 0.00000 0.06098 0.00000 0.00000 0 -0.06098 -0.06098 0

10 -0.06098 -0.06098 0 0.00000 0.00000 0 -0.06098 -0.06098

Totals -0.54882 -0.48784 #N/A 0.18294 -0.06098 -0.12196 #N/A 0.18294 -0.54882 -0.6098 #N/A 0.06098

-0.54882 0.018294 -0.06098 0.018294 -0.54882 0.00

#N/A RA #N/A RB #N/A R

Sum -1.03666 Sum -0.18294 Sum -1.15862XA -0.051833 X B -0.009147 X C -0.057931

RA 0.018294 # Trials D4 Max X

RB 0.018294 2 3.27 Min X

RC 0.006098 3 2.58 X Diff.Sum 0.042686

R 0.0142287

Notes:

and unit as originally used or discard and reaverage and recompute R and the limiting value UCL R from the remaining observations

A - B - C -

* Limit of individual R's. Circle those that are beyond this Limit. Identify the cause and correct. Repeat these readings using the same appraiser

( R ) x ( D 4 ) = UCL R*

0.014228667 3.27 0.0465277


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Gage R and R (Xbar/R method)Six Sigma MSA Method

-0.07

-0.06

-0.05

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-0.01

0

S a m p

l e M e a n

Xbar Chart by Operator

-0.07

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-0.05-0.04

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-0.01

01 2 3 4 5 6 7 8 9 10

A v e r a g e

Part No.

Operator*Part No. Interaction A - B - C -

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S a m p

l e R a n g e

R Chart by Operator

-0.06

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-0.01

01 2 3

O p e r a

t o r

Response by Operator


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Measurement System EvaluationSix Sigma MSE Method

Step 1 Measurement Stability A stable measurement system shows no out of control points or "non-random" patterns or trends in the range chart

Step 2 Resolution / Discrimination Adequate resolution or discrimination means that the measurement units (inches, tenths of inches, thousandths of inches,)are sufficiently small enough to be able to "see" variation.

- Stratification on a range chart is a good indication that there is a problem with inadequate resolution.- The number of stratified levels on the Range Chart is an indicator of the degree of the problem.- Fewer "levels" means less adequate resolution:- A rule of thumb: There should be approximately 5 levels of resolution between the control limits on the Range Chart and

less than 25% of the ranges equal to zero to be considered adequate.

0

0.01

0.02

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0.07

A - A - A - A - A - A - A - A - A - A - B - B - B - B - B - B - B - B - B - B - C - C - C - C - C - C - C - C - C - C -

S a m p l e

R a n g e

R Chart by Operator

Xbar Chart by Operator


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Step 5 Operator BiasOperator Bias is the comparison of Between-Operator variation to Within-Operator variation. An out-of-control chart indicates thata Bias does exist between operators, while a chart exhibiting control indicates that no Bias exists between operators.

-0.09

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-0.07

-0.06-0.05

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-0.01

01 2 3

A v e r a g e s

Operator

Operator Bias

0 030.035

0.040.045

0.05

g e s

Operator Inconsistency


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-0.07

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0-0.07 -0.06 -0.05 -0.04 -0.03 -0.02 -0.01 0

Y v a

l u e

X value

Intraclass Correlation Plot


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0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

- 1

. 5 0 0 0

- 1

. 0 0 0 0

- 0

. 5 0 0 0

0 . 0

0 0 0

0 . 5

0 0 0

1 . 0

0 0 0

1 . 5

0 0 0

2 . 0

0 0 0

2 . 5

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3 . 5

0 0 0

P a

( P r o

b a

b i l i t y o f

A c c e p

t a n c e

)

Dimension

Gage Performance Curve

Specifications

Pa

Part Variation

Gage Error

Total Variation

7/20/20138:51 AM

08 msa grr example 1

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