posted 01 October 1998 06:04 PM               

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 ãvanishedä 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