151

Appendix B: Gauge

R&R Forms

FORM B.1

Data Collection

Gauge type: Gauge number: Resolution:

Characteristic: Specication: Total tolerance:

Work cell: Operation number: Characteristic number:

Operator A name: Operator B name: Operator C name:

Operator A Replications Range

Sample

1

2

3

4

5

6

7

8

9

10

Operator

B

Sample

1

2

3

4

5

6

7

8

9

10

Continued

152 • Appendix B: Gauge R&R Forms

FORM B.1 (continued)

Data Collection

Operator

C Replications Range

Sample

1

2

3

4

5

6

7

8

9

10

FORM B.2

GR&R Calculation

1. Gauge type: Gauge number: Resolution:

2. Characteristic: Specication: Total tolerance:

3. Work cell: Operation number: Characteristic number:

4. Operator A name: Operator B name: Operator C name:

5. Average range for

Operator A:

Average range for

Operator B:

Average range for

Operator C:

6. Average measurement

value for Operator A:

Average measurement

value for Operator B:

Average measurement

value for Operator C:

7. Repeatability

R

r

value for 2 operators

Average of all ranges in

line 5 × 4.56 =

____________

Repeatability

R

r

value for 3 operators

Average of all ranges in

line 5 × 3.05 =

____________

Repeatability as % of

tolerance (total tolerance

from line 2)

R/ tolerance × 100 =

____________

8. Reproducibility

Xr value

Xr = Highest value in

line 5 minus lowest

value in line 5

Xr = __

Reproducibility

K factor

If 2 operators, K factor

for line 9 is 3.65

Reproducibility

K factor

If 3 operators, K factor for

line 9 is 2.70

Appendix B: Gauge R&R Forms • 153

FORM B.2 (continued)

GR&R Calculation

9. Reproducibility

correction for

repeatability and

sampling, nr value

nr = number of parts ×

number of

measurements per part

____________

Reproducibility

Y =

()

Xr XK

Rr

nr

2

2

−

Y = ____________

Reproducibility as % of

tolerance

Y/ total tolerance × 100 =

____________

10. Gauge R&R

GR&R =

YR

r

22

+

=

____________

GR&R as % of tolerance

GR&R/ total tolerance ×

100 = ____________

FORM B.3

Gauge Stability Determination

Gauge type: Gauge number: Gauge resolution:

Characteristic: Specication: Total tolerance:

Work cell: Operation number: Characteristic number:

Record one reading per interval for 30 intervals. Intervals may be 1 day, week, or

month depending on gauge use frequency.

1 2 3

4 5 6

7 8 9

10 11 12

13 14 15

16 17 18

19 20 21

22 23 24

25 26 27

28 29 30

Range is maximum minus

minimum

Range =

Stability is range/ total

tolerance × 100

Stability =

If stability is 15% or less of

total tolerance, then

gauge is suciently stable

154 • Appendix B: Gauge R&R Forms

FORM B.4

Gauge Linearity Determination

Gauge type: Gauge number: Gauge resolution:

Characteristic: Specication: Total tolerance:

Work cell: Operation number: Characteristic number:

Divide total measurement range of gauge into 10 equal intervals and measure a known

standard for each interval. Record the deviation from each of the known values.

1 2 3 4 5

6 7 8 9 10

Range is maximum minus

minimum

Range =

Linearity is range/ total

tolerance × 100

Linearity =

If linearity is 15% or less

of total tolerance, then

gauge is suciently

stable

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