Designing a Mil-Std-105 or ANSI/ASQ Z1.4 Sampling Plan

Elsmar Forum Sponsor
#32
Ref to Mike's post,
"About the authors"

And they owe it all to Phillip Crosby who initiated the Zero Defects concept/methodology, despite the laughter and ridicule from his peers.
 
L

lday38

#34
2003 ansi/aswc Z1.4

I just purchased the latest mil std 105 E from ASQC, I was disapointed to see they took out the referance to variable sampling plans. I would like to use a statistical basis for choosing the number of pcs to be sampled at final
inspection based on the product's history. This is for tier 1 automotive. Might I be on the right track with mild std 114?
 

CarolX

Super Moderator
Super Moderator
#35
looking for clarification

howste said:
I'd probably set up a sampling plan based on ANSI/ASQ Z1.4 since it sounds like you're doing attribute sampling. MIL-STD-105E is equivalent to that standard, and you can download it free here.
Hello Folks,

I just want to confirm from the gurus this statement. I need to implement a plan today, and I already have a copy of 105E. I haven't check availability of Z1.4 for delivery into my hands.

Thanks in advance.....you folks are the best!!!

Carol
 

howste

Thaumaturge
Super Moderator
#36
:confused: What statement are you wanting confirmed? If you mean that 105E is equivalent to ANSI/ASQ Z1.4, here's a link that explains the differences:
http://www.variation.com/FAQs.html#AS4
What are the differences between MIL-STD-105E and ANSI/ASQ-Z1.4?
ANSI/ASQ Z1.4 (1993) is nearly identical to Mil-Std-105E. There are no changes in the tables of sampling plans. The only change in the switching rules is that ANSI Z1.4 makes the use of the limit numbers for switching to reduced optional. In addition, ANSI/ASQ-Z1.4 contains additional OC curves called scheme OC curves that describe the protection provided by the switching procedure during periods of constant quality. Numerous changes where also made to the explanatory text but which do not affect any procedures.
 

Al Rosen

Staff member
Super Moderator
#38
CarolX said:
Hello Folks,

I just want to confirm from the gurus this statement. I need to implement a plan today, and I already have a copy of Mil Std 105E. I haven't check availability of Z1.4 for delivery into my hands.

Thanks in advance.....you folks are the best!!!

Carol
Carol:

It is the same. See the attached CANCELLATION notice (105N1.pdf).
 

Attachments

Tim Folkerts

Super Moderator
#39
I know this is an old question, but I wanted to add a few comments.

My question is how do I generate a correct sampling plan? Customer goal is 0.08dphu
I can think of at least three ways to interpet this goal, and this interpretation has a big affect on the sampling you do:
1) The customer will accept no more than 0.08 dphu and will reject most lots that are any worse than 0.08 dphu.
2) The customer will accept an average of 0.08 dphu and will lots as long as the average doesn't get above about 0.08 dphu.
3) The customer will accept 0.08 dphu and will accept most lots that are no worse than 0.08 dphu.

The sampling plan used by a customer would vary greatly depending on which situations was the case. The required quality required from the producer also varies widely.
In case 1, you might need to aim for 0.04 dphu in order to avoid getting too many rejected lots back from the customer.
In case 2, you would aim for 0.08 (or a little less) dphu in order to avoid getting too many rejected lots back from the customer.
In case 3, you might get away with 0.12 dphu and still have most of the lots accepted.

The ASQ Z1.4 (MIL-STD-105E) tables are generally set up for situation 3. I.e, when you sample, you will accept most (say 90% to 99%) of lots with the specified AQL.

As a producer doing sampling, you need to decide your goal. Do you want to ensure that nearly all lots meet or accede the customer requirement? Or do you simple want to ensure that the customer's sampling plan won't reject too many shipments?


Do I need to know all the 4 information (AQL, alpha, LTPD, beta) to determine the sampling plan? I came across some example which only requires AQL and alpha. Pls. advise.
Yes and no. With the ASQ Z1.4 tables, you only need to specify AQL, because the four values are assumed to have reasonable values if you follow the plan. This upside is that you don't need to worry about the details, because the authors of the plan did that for you.

The downside is that you can't easily know what the actual numbers are. For example, you might think that the tables would be set up so that the alpha values would be something like tightened = alpha = 0.1, normal = 0.05, reduced = 0.01, but that isn't the case. There is a considerable variation in alpha depending on the AQL and the lot size. There is even less uniformity in the LTPD & beta. (Personally, I'd like to see these tables scrapped and replaced by a "standard" piece of software. You would input the AQL, LTPD, alpha, & beta, and it would output the sampling plan.

If you are motivated, you can look at the tables & OC curves at the back of the book to determine what the specific values are for each plan.

If you are really motivated (or buy the right software) you can specify all four values and generate your own plan to exactly meet your specs.


Tim F
 
S

sal881vw

#40
Hello all,
I've found the following information should it be of interest to anyone,
2. ANSI/ASQ Z1.4-2003 and ANSI/ASQ Z1.9-2003
ANSI/ASQ Z1.4-2003 (Sampling Procedures and Tables for Inspection by Attributes) and ANSI/ASQ Z1.9-2003 (Sampling Procedures and Tables for Inspection by Variables for Percent Nonconforming) have been published.

ANSI/ASQ Z1.4-2003 is an acceptance sampling system to be used with switching rules on a continuing stream of lots for a specified Acceptance Quality Limit .It provides tightened, normal, and reduced plans to be applied for attributes inspection for percent nonconforming or nonconformities per 100 units.

ANSI/ASQ Z1.4-2003 replaces ANSI/ASQC Z1.4-1993 and is available through ASQ for a member price of $88.00. Go to: http://qualitypress.asq.org/perl/catalog.cgi?item=T004 .

ANSI/ASQ Z1.9-2003 is an acceptance sampling system to be used on a continuing stream of lots for a specified Acceptance Quality Limit. It provides tightened, normal, and reduced plans to be used on measurements which are normally distributed. Variation may be measured by sample standard deviation, sample range, or known standard deviation. It is applicable only when the normality of the measurements is assured.

ANSI/ASQ Z1.9-2003 replaces ANSI/ASQC Z1.9-1993 and is available through ASQ for a member price of $76.00. Go to: http://qualitypress.asq.org/perl/catalog.cgi?item=T009 .


also the following sites may be of some help
http://www.ma.mbe.doe.gov/a-76/FINALQASP31403.pdf pages 10 to 14
http://www.gisdevelopment.net/proceedings/gita/2001/dfd/techgi010b.shtml
http://www.tesco-advent.com/pdf/Statistical-electric.pdf pages 14 to 19
 
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