Gage r&r part ii 082015

Part II of Gage R&R. Practical Application

1. Practice Exercise of a
Dimensional Gage R&R
Study, Part II
Rahul Iyer, ASQ-CQE
Mesa AZ
August 2015

2. Overview
Practice Exercise of a Dimensional Gage
R&R Study
–Data Collection
–Calculating The Sample Means, The Sample
Ranges, and Part Average (Xp)
–G R&R Calculations
Acceptability Criteria For Determining if
Gage Passes and Is Useful

3. Description Of Measurement
•On a product we have the following specification:
–The extension length must be 0.380 to 0.480 inch.

4. Data Collection

Let us measure the dimension with a
caliper--Variable readout (specification =
0.380 in. to 0.480 in.)
Operator A:

5. Data Collection

Operator B:

6. Data Collection

Operator C:

7. Intentionally Left Blank

8. Calculating The Sample Means

Operator A:

9. Calculating The Sample Means

Operator B:

10. Calculating The Sample Means

Operator C:

11. Intentionally Left Blank

12. Calculating The Sample
Ranges

Operator A:

13. Calculating The Sample
Ranges

Operator B:

14. Calculating The Sample
Ranges

Operator C:

15. Intentionally Left Blank

16. Calculating The Trial Means

17. Calculating The Trial Means

18. Calculating The Trial Means

19. Intentionally Left Blank

20. Calculating Part Average
(Xp)

21. Intentionally Left Blank

22. G R&R Calculations

Constants are as follows:
n = 3,
D4* = 2.58, D3* = 0,
K1 = 3.05, K2 = 2.70, K3 = 1.62

23. G R&R Calculations

24. G R&R Calculations

%PROCESS VARIATION
%EV = 100[EV / TV]
%EV = 98.251%
%AV = 100[AV / TV]
%AV = -6.122%
%R&R = 100[R&R / TV]
%R&R = 98.251%
%PV = 100[PV / TV]
%PV = 18.076%

25. Intentionally Left Blank

26. Acceptability Criteria For Determining if Gage
Passes and Is Useful

27. Conclusion
Practice Exercise of a Dimensional Gage
R&R Study
Acceptability Criteria For Determining if
Gage Passes and Is Useful
Further illustration regarding the
concerns surrounding the use of
calipers as measurement tools

28. Questions