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Former Member
Sep 22, 2008 at 09:37 AM

Sample Size Calculation based on the results


Dear all

I have a scenario as below

for a product the upper and lower specification is given as below

Upper spec 19.00mm

Standard 18.00mm

Lower spec 17.00mm

my client is having ranges as below

Range 1

Upper spec 19.0 to 18.75

Lower spec 17.0 to 17.25

Range 2

Upper spec 18.75 to 18.50

Lower spec 17.25 to 17.50

Range 3

Upper spec 18.50 to 18.25

Lower spec 17.50 to 17.75

Range 4

Upper spec 18.25 to 18.00

Lower spec 17.75 to 18.00

a) Initially the sample size is 50%. Starts with range 4 .

b) if consecutive 5 receipts are ok we want to switch to range 3 - sample size 25%.

c) if consecutive 5 receipts are ok we want to switch to range 2 sample size 10%

e) and range 1 sample size 5%.

f) if there is any rejection at any range, then reset to range 4.

g) if out of specification noticed then the next incoming material will be inspection in the next lowest range. ie in range 1 out of specification noticed shift to range 2 in the next Goods receipt.

I know that Sampling scheme can be used but how to link the specifications in it.

How to link this in SAP QM.

awaiting for your valuable feed back Please.