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December 1999

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Subject:
From:
Lou Hart <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 2 Dec 1999 17:01:37 -0500
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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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