The Elsmar Cove Business Standards Discussion Forums More Free Files Forum Discussion Thread Post Attachments Listing Elsmar Cove Discussion Forums Main Page
Welcome to what was The Original Cayman Cove Forums!
This thread is carried over and continued in the Current Elsmar Cove Forums

Search the Elsmar Cove!

Wooden Line
This is a "Frozen" Legacy Forum.
Most links on this page do NOT work.
Discussions since 2001 are HERE

Owl Line
The New Elsmar Cove Forums   The New Elsmar Cove Forums
  Statistical Techniques and 6 Sigma
  Continous Flow Sampling Plans

Post New Topic  Post A Reply
profile | register | preferences | faq | search

UBBFriend: Email This Page to Someone! next newest topic | next oldest topic
Author Topic:   Continous Flow Sampling Plans
Lurker (<10 Posts)

Posts: 2
Registered: Apr 2001

posted 02 May 2001 04:30 PM     Click Here to See the Profile for MCDeNovo     Edit/Delete Message   Reply w/Quote
I currently use a C=0 sampling plan with a default AQL of 4.0 for visual inspections on the production floor. Production is moving from batch processing to continous flow. Where can I find information for developing a sampling plan to use in a continous flow process as opposed to a batch process?

IP: Logged

Johnny Jewel
Lurker (<10 Posts)

Posts: 2
Registered: Apr 2001

posted 03 May 2001 10:34 PM     Click Here to See the Profile for Johnny Jewel     Edit/Delete Message   Reply w/Quote
There is an ASQ publication, ćHow to Perform Continuous Sampling (CSP)ä by Kenneth Stephens. Some of the sampling schemes it considers are from the old MIL-STD-1235C, which, for some reason, was not carried over to be an ANSI/AQC specification as, for instance, MIL-STD-105E was. Juranās 3rd Edition is good also; from the 4th on, too much condensation was done to be of much value.

My organization studied continuous sampling during the development of a new product line. Our historical assembly method was by 1 person start-to-finish. The new product was concurrently designed with a new assembly line production process, and testing was changed from batch method (105E) to a continuous sampling plan. CSP-V met our requirements and has been in use for about 4 years.

The scary part of CSPās is the requirement of 100% inspection at the beginning and whenever a non-conformance is detected. This can make the concept a hard sell, and growing into the plan can be agonizing. Batching for this product/assembly line would have been completely artificial, considering the nature of part flow to the line and the way the product is adjusted during/after assembly. One feature that is designed into the plans is that there is no retrieval when a non-conformance is detected. Depending on the plan chosen, you either immediately re-sample for verification or go immediately to 100% inspection until some clearance number of continuous OK product is reached. Then you go back to sampling. There are trade-offs among the types of plans, the main one being that as the % sampled decreases, the clearance number gets larger and vice-versa.

The good news for us was that the product was robust for the characteristic tested. At least that is how some have viewed the experience. There also was a big incentive to develop the product ö tune it, continuously improve it -- to keep it out of the dreaded 100% inspection. In other words, we may have more confidence in this product because of the sampling plan that was chosen.

IP: Logged

Forum Contributor

Posts: 20
From:Normandy, TN 37360
Registered: Mar 2001

posted 04 May 2001 09:22 AM     Click Here to See the Profile for dWizard   Click Here to Email dWizard     Edit/Delete Message   Reply w/Quote
This site has some good stuff on sampling.

This site has some standards for download that may be of use.


I was better but I got over it.

IP: Logged

All times are Eastern Standard Time (USA)

next newest topic | next oldest topic

Administrative Options: Close Topic | Archive/Move | Delete Topic
Post New Topic  Post A Reply Hop to:

Contact Us | The Elsmar Cove Home Page

Your Input Into These Forums Is Appreciated! Thanks!

Main Site Search
Y'All Come Back Now, Ya Hear?
Powered by FreeBSD!Made With A Mac!Powered by Apache!