Practice Exercise of a Dimensional Gage R&R

Study, Part IIRahul Iyer, ASQ-CQE

Mesa AZAugust 2015

OverviewPractice 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

Description Of Measurement• On a product we have the following specification:

– The extension length must be 0.380 to 0.480 inch.

Data Collection Let us measure the dimension with a

caliper--Variable readout (specification = 0.380 in. to 0.480 in.)

Operator A:

Data Collection

Operator B:

Data Collection

Operator C:

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Calculating The Sample Means

Operator A:

Calculating The Sample Means

Operator B:

Calculating The Sample Means

Operator C:

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Calculating The Sample Ranges

Operator A:

Calculating The Sample Ranges

Operator B:

Calculating The Sample Ranges

Operator C:

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Calculating The Trial Means

Calculating The Trial Means

Calculating The Trial Means

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Calculating Part Average (Xp)

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G R&R Calculations

Constants are as follows: n = 3,

D4* = 2.58, D3* = 0, K1 = 3.05, K2 = 2.70, K3 = 1.62

G R&R Calculations

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%

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Acceptability Criteria For Determining if Gage Passes and Is Useful

ConclusionPractice Exercise of a Dimensional

Gage R&R StudyAcceptability Criteria For

Determining if Gage Passes and Is Useful Further illustration regarding the

concerns surrounding the use of calipers as measurement tools

Questions