Jeff, sorry for the delayed response to your posting. Someone earlier suggested an IPC document on SPC in assembly. I believe it is available now, based on what I saw in the latest IPC review. I requested it and eagerly await its arrival (its number I forget offhand).
There have been discussions of SPC earlier in this forum, with people exhibiting varying degrees of enthusiam. My generic feeling is: if you're collecting data, use it. Frequently that use will be through SPC. (If you're not using the data, stop collecting it.) You've heard Deming's advice - Plot the dots. Individuals control charts may be useful to you. I don't know if c or p charts would be. It depends on the volume of your production.
Two books I've come across recently may be worth knowing about. Statistical Control by Monitoring and Feedback Adjustment, written by Box and Luceno, deals with basic SPC and also with methods to make adjustments in processes where that is possible. Another book by Quesenberry treats SPC, adjustment methods, and SPC for short-run processes. It also seems to have some nice discussions of general quality techniques. I haven't done more than glance through it so far.
Please don't hesitate to contact me outside TechNet if you want more information. I am new to this business as well and would welcome the chance to work with you on these matters.
Louis Hart
Quality Assurance Manager
Instrumentation Systems Division
Compunetix, Inc. 412-858-6184
Monroeville, PA 15146
"With the chart on the wall, with the figures published, let's emulate and rouse our enthusiasm in production."
- State Statistical Bureau of the People's Republic of China
----------
From: Isaac Jeff[SMTP:[log in to unmask]]
Sent: Wednesday, November 24, 1999 2:03 AM
To: [log in to unmask]
Subject: [TN] SPC Information
Dear all
I would like to setup a meaningful SPC / SQC system in my production and test
sections. I have searched the archives and have obtained useful information and
links to websites offering software to setup / control / monitor an SPC system.
I don't want to go on a course which will explain how to do this if the course
tackles all industries. I would like to go on a course which relates
specifically to Electronic Manufacturing as I believe this would show me exactly
what data I can be capturing and how to capture it which would be helpful to
control and monitor the assembly process.
Does anyone know of an SPC course that relates specifically to electronic
manufacturing in Sydney / Australia ?
or better
Does anyone know of some company / person in Sydney / Australia who would come
to my company and explain the absolute basics of setting up a meaningful SPC /
SQC system ? For a fee of course.
As you can tell this is very new to me, but everyone needs to start somewhere.
To date one of the ways I've been tackling quality problems is by getting
feedback from the testing area as to the reasons for quality problems /
failures. This then highlights a number of factors in the process which I can
address to prevent these faults (less than 0.04 dppm) from re-occuring. We also
have inspection points along the way ie. after screenprinting, after pick&place,
after reflow but I am at a loss to what data I can be capturing, and how to put
this data into the various formulas out there to calculate Cpk, Cp, Ppm etc. I
have been doing a lot of reading, but am in need of personal tuition.
Many thanks in advance for the help.
Regards,
Jeff Isaac
Hypertec Australia
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