Lou has a made a very good point. In one article I wrote for PC Fab some
years ago on SPC, I made a similar comment. Oh the subsequent wailing and
gnashing of teeth!!
I stated in this article that one of the first things and effective SPC
program will highlight is incompetence. The problem is simple. Once you
highlight a concern, someone now is expected to fix it. In many instances,
those responsible may not be able to fix it. This presents a significant
problem to many in our industry that may have been promoted into positions
that they are simply not qualified for.
I know many may challenge my position on this but I suspect when were alone
and no one is around, we all can relate to individuals to which my scenario
applies.
Just my opinion and that's all it is.
Ed Cosper
----- Original Message -----
From: Lou Hart <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, December 02, 1999 5:01 PM
Subject: Re: [TN] SPC Information
Thanks, Bob, for your comments on SPC. Your last point is critical - gage
error. If you don't have a good gage, give up right away. By good, I mean
not that it is able to determine that something does or does not meet spec,
rather, that it can discriminate between parts or coupons or any test sample
that actually comes off the production line. There's a book by Don Wheeler,
Evaluating the Measurement Process, that deals with this point.
SPC is not a cookie cutter approach. You need some engineering sense. I
dare say no one who has used SPC found a recipe for it in his or her
industry in a book. It's a tool. I can go out and buy a box of wrenches,
but that doesn't make me a car mechanic.
I'm interested to hear from others on the new IPC document on SPC in
assembly, am still eagerly awaiting my copy.
Why is SPC not used more widely? It's been around 70 years, easy to use,
and it helps. Hate to sound cynical, but maybe it's because with SPC any
operator can see and prove when engineering and management has given him an
incapable process.
Lou Hart
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