How to use sampling procedure

[Former Member]

Hello Friends,

I have to map the following scenario. Please advise the config & master data.

1) My sample size should change if my acceptance & rejecetion level changes.

2) If rejection increases then the sample size in the next lot should increase & the vice versa.

Regards

[Former Member]

1) My sample size should change if my acceptance & rejecetion level changes.

2) If rejection increases then the sample size in the next lot should increase & the vice versa

There are seviarities in the sampling procedure & Dynamic modification rule by which you can change the quality level by tightening or reducing the sample size.

Prerequisite is to use sampling scheme in sampling procedure and use DMR in the task list header @ lot level or @ char level..

and Maintain the relation in QDB1 t code

Explore this !

[Former Member]

Thanks for the reply. Seems to be critical......

Request to provide some guide lines to start with....

1) is it the correct assignment? ( Inspection plan to DMR to Sampling procedure to sammpling scheme )

DMR will find the next stage of inspection with severity......

But how it will find the sampling procedure as one DMR is assigned to multiple sampling procedure (checked the standard setting)

2) Do I have to assign only the DMR at inspection plan header?

3) What about sampling procedure? The sampling procedure field for the characteristics are grayed out in my plan. Do I have to assign this also? If so then how to make it editable?

Regards

[Former Member]

I am not sure about your level of understanding about QM but still try to put some things :

1) is it the correct assignment? ( Inspection plan to DMR to Sampling procedure to sammpling scheme )

-->Yes its std way.

DMR will find the next stage of inspection with severity......

But how it will find the sampling procedure as one DMR is assigned to multiple sampling procedure (checked the standard setting)

--->you can create SP for a seviarity(of sampling scheme) and depending upon the seviarity of SP & DMR relation established in table of relationship.Explore this.Try to give different seviarity in DMR & SP & try to assign in table.

2) Do I have to assign only the DMR at inspection plan header?

---> if you want to change seviarity for individual MIC's then assign @ char level else @ lot level.

3) What about sampling procedure? The sampling procedure field for the characteristics are grayed out in my plan. Do I have to assign this also? If so then how to make it editable?

-->check the control indicator of a char/mic , tick on sampling procedure.

for details refer the std help from

http://help.sap.com/saphelp_46c/helpdata/en/2d/350bcb448c11d189420000e829fbbd/content.htm

[Former Member]

Hello Sir,

Thanks for your valuable reply. I have progressed on this. I need some more help.

Let us park DMR for a while. DMR is working fine. But I have some issues in results recording.

Let us only work only with sampling procedure with sampling scheme.

I have taken one inspection characteristic. It is quantitavie characteristic. It has lower limit as 10% & upper limit as 15%.

what I have done

1)

I have created one sampling scheme = ABC

Valuation parameter = variable inspection by S method

sampling table = severity/AQL

For normal inpsection (4) I have taken AQL as 2.

Lot size = 100

Sample size = 15

K-Factor = 3

2)

I created one sampling procedure = XYZ

Sampling type = Use sampling scheme

Valuation mode = Variable inpscetion S - Method (two limits)

without inpsection points

assigned sampling scheme = ABC

No multiple samples

Inspection severity 4

AQL value 2.000

3)

I assigned the sampling procedure in the plan with the characteristic.

4)

I did GR for 100 & sample of 15 generated.

why I have done

1)

In sampling scheme

valuation parameter = variable inspection by S method (because my characteristic is quantitative)

2)

In sampling procedure

Valuation mode = Variable inpscetion S - Method (two limits) (because my characteristic is quantitative with lower & upper limit )

My issues:

1) Is my settings for a quantitative characteristic with lower & upper limit correct?

2) During results recording system is asking to enter StdDev. What is standard deviation?

3) How characteristic is accepted & rejected? I am not getting any pop up to select accept or reject?

Regards

[Former Member]

My issues:

1) Is my settings for a quantitative characteristic with lower & upper limit correct?

yes

2) During results recording system is asking to enter StdDev. What is standard deviation?

As I know system calculates st deviation which is shift of entered value from mean value( mainly use for six sigma calculation)

You jst have to enter the measured value or accepted number etc

3) How characteristic is accepted & rejected? I am not getting any pop up to select accept or reject?

As valuation you selected is "Variable inspection S - Method (two limits)" or "Variable inspection S" ,system consider this as Auto valuation unless you specify Manual valuation.

[Former Member]

Hello friends,

In one of the SAP documents I found the below formual by which a quantitative characteristic is accepted or rejected.

X = mean value

S = standard deviation

K = acceptance factor

The value k is the acceptance factor / K Factor defined in the sampling plan.

S = (USL u2013 LSL)/2*K

The inspection characteristic is rejected if the following conditions are met:

Mean > USL - k * s

or

Mean < LSL + k * s

My question is

1) What is K-Factor for a Variable Inspection.

Is it defined by some international standard or do we have to define it?

Regards