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  Statistical Techniques and 6 Sigma
  SPC for Short Runs

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Author Topic:   SPC for Short Runs
Don Winton
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From:Tullahoma, TN
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posted 01 October 1998 06:04 PM     Click Here to See the Profile for Don Winton   Click Here to Email Don Winton     Edit/Delete Message   Reply w/Quote
Folks,

I received this recently and require assistance. Years ago (too many, Iâm afraid), I studied SPC for short runs but do not remember a lick of it. All my reference material has ăvanishedä from the time and I would like comment. I will forward (with appropriate credit, of course) if someone can help, or provide a location where this information is available. I have already suggested the pre-control method, but he still wants details on short run SPC (Which, IMHO, is an oxymoron, but that is another story). All for now.

Thanks in advance and Best Regards,

Dear Don,
I am a Quality engineer at Hindustan motors Ltd, Mfgr of Earthmoving equipment incollabration with CAT, USA We process components for which the batch qty is less and hence the need for Short run SPC, with moving avg & moving range method I find it to be more sensitive than normal SPC. Precontrol charts are used in the existing system but that involves use of specification limits instead of control limits. I prefer control limits to process control. Please let me know if there is material available in this regard.

Bye

Venu

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Roger Eastin
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posted 02 October 1998 08:39 AM     Click Here to See the Profile for Roger Eastin   Click Here to Email Roger Eastin     Edit/Delete Message   Reply w/Quote
Don,
The ASQ Publications catalog has several SPC texts that have short-run SPC as a topic. I used it several years ago on a machine that made several different types of product and the biggest problem I had was interpreting how much to change a setting if it was out of control. Anyway, if I remember correctly, the first book that I saw on this topic was authored by a guy named Bothe. It is probably easy to go to the ASQ website and do a search.

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barb butrym
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posted 08 October 1998 07:01 PM     Click Here to See the Profile for barb butrym   Click Here to Email barb butrym     Edit/Delete Message   Reply w/Quote
try DPMO ..it can be done for runs of 1.

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Roger Eastin
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posted 09 October 1998 08:25 AM     Click Here to See the Profile for Roger Eastin   Click Here to Email Roger Eastin     Edit/Delete Message   Reply w/Quote
I am not always real good at acronyms: what is DPMO? (Shoot, I just found out last week what IMHO meant!) Thanks.

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Don Winton
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posted 09 October 1998 12:45 PM     Click Here to See the Profile for Don Winton   Click Here to Email Don Winton     Edit/Delete Message   Reply w/Quote
Defects Per Million Opportunities: an attribute chart used in assembly operations when an item or part contains many opportunities for a defect to occur. For example, a circuit board assembly contains many components and operations that must be successfully completed to make the final assembly. This type of operation typically uses a DPMO control chart during final inspection for monitoring the processes involved.

[This message has been edited by Don Winton (edited 10-09-98).]

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Leslie Garon
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From:Chicago'ish, IL, USA
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posted 09 October 1998 02:25 PM     Click Here to See the Profile for Leslie Garon   Click Here to Email Leslie Garon     Edit/Delete Message   Reply w/Quote
What does IHMO stand for?

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barb butrym
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posted 09 October 1998 05:27 PM     Click Here to See the Profile for barb butrym   Click Here to Email barb butrym     Edit/Delete Message   Reply w/Quote
IMHO In My humble opinion
another i use often.......
LOL laugh Out loud

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Don Winton
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posted 09 October 1998 05:39 PM     Click Here to See the Profile for Don Winton   Click Here to Email Don Winton     Edit/Delete Message   Reply w/Quote
Roger and barb,
I forgot. Thanx for your comments and suggestions.

Best Reagrds,
Don

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