Essentials of quality with cases and experiential exercises 1. A quality enginee

Question

Essentials of quality with cases and experiential exercises

1.                  A quality engineer is conducting a gauge R & R study of a new measurement system. He has had 2 operators measure 10 parts 2 times and has recorded the following data:

D = 0.060

   = 0.018 (None of the individual ranges exceed the control limit)

Calculate the EV, OV, and RR.

If the specification is 0.750 ± 0.250, would the gauging system be considered to be acceptable? Would your answer change if the part being measured was a component of an emergency fire suppression system whose functioning depended on this part being within tolerance?

2.                  A gauge R&R study has been conducted on a measuring system. Three trained operators measured 5 parts 3 times using a properly calibrated instrument. The tolerance for the parts is 0.750 ± 0.150.

D = 0.060

   = 0.018 (None of the individual ranges exceed the control limit)

Calculate EV, OV, and RR in absolute terms and as a percentage of tolerance.

3.                  A gauge R&R study has determined the following:

EV = 0.0212

OV = 0.0925

            Calculate RR. Given that the tolerance for this measurement is 1.50 ± 0.25, would this gauging system be considered to be acceptable? What action would you recommend to improve RR?

4.         You have obtained the following data from a gauge R&R study. The gauge is properly calibrated and the operators are trained.

Operator 1

Operator 1

Operator 2

Operator 2

Part

Trial 1

Trial 2

Trial 1

Trial 2

1

1.005

1.004

1.004

1.004

2

1.006

1.003

1.003

1.005

3

1.008

1.010

1.009

1.008

4

1.015

1.013

1.012

1.012

5

1.014

1.014

1.012

1.014

6

1.007

1.005

1.006

1.005

7

1.015

1.013

1.015

1.016

8

1.005

1.002

1.004

1.005

9

1.008

1.007

1.008

1.008

10

1.010

1.012

1.014

1.013

a) Calculate EV.

b) Calculate OV.

c) Calculate RR.

d) Given that the tolerance for the measurement is 1.010 ± 0.015, calculate RR as a percent of tolerance.

e) Is the measurement system acceptable? Explain.

5.         You have obtained the following data from a gauge R&R study. The gauge is properly calibrated and the operators are trained. You carefully observed the process and did not observe any assignable causes for error.

Operator 1

Operator 1

Operator 2

Operator 2

Part

Trial 1

Trial 2

Trial 1

Trial 2

1

1.005

1.004

1.004

1.004

2

1.025

1.003

1.003

1.005

3

1.008

1.010

1.009

1.008

4

1.015

1.013

1.012

1.012

5

1.014

1.014

1.012

1.014

6

1.007

1.005

1.006

1.005

7

1.015

1.013

1.015

1.016

8

1.005

1.002

1.004

1.005

9

1.008

1.007

1.008

1.008

10

1.010

1.012

1.014

1.013

a) Calculate EV.

b) Calculate OV.

c) Calculate RR.

d) Given that the tolerance for the measurement is 1.010 ± 0.015, calculate RR as a percent of tolerance.

e) Is the measurement system acceptable? Explain

Operator 1

Operator 1

Operator 2

Operator 2

Part

Trial 1

Trial 2

Trial 1

Trial 2

1

1.005

1.004

1.004

1.004

2

1.006

1.003

1.003

1.005

3

1.008

1.010

1.009

1.008

4

1.015

1.013

1.012

1.012

5

1.014

1.014

1.012

1.014

6

1.007

1.005

1.006

1.005

7

1.015

1.013

1.015

1.016

8

1.005

1.002

1.004

1.005

9

1.008

1.007

1.008

1.008

10

1.010

1.012

1.014

1.013

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Essentials of quality with cases and experiential exercises 1. A quality enginee

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