Chris,
Good luck, That would be a gallant effort to help out.
Yes it would be a bit easier for the new person to look through
a simple spreadsheet or document table that spells out levels
of capability all in one place. Rather than having to look at several
different areas to gain this knowledge. I guess we all get set in our
ways, so having this type of data all in one place could help one to
consider
more possibilities every time one starts a design.
Bob Wolfe


-----Original Message-----
From: Chris Robertson [mailto:[log in to unmask]]
Sent: Friday, March 09, 2001 1:41 PM
To: [log in to unmask]
Subject: [DC] Manufacturing Guidelines


Hello again,

I've spoke with several manufacturers about giving them
a survey to fill out on guidelines of capabilities.
All I have spoke with were not only interested but very
supportive.
The understanding is these would only be guideline that
would neither control or rule manufacturers, but provide
both the designer and the manufacturer of what is required.

I have a list of 80 manufacturers, across the US (provided
by Tom Hausherr of the windriver group) and intend on
taking my time and collecting a good selection of values
to present as an independent survey.

At the survey's completion I will present this to the IPC
local chapter...pending application.

I believe if executed correctly, we as designers will have
a hard rule to follow.

This will entail either;
support by IPC documentation so designers may specify
a technology and the manufacturer will clearly know what
is expected of them.
or
Designers may independently request their manufacturers follow
these guidelines.

It is understandable that some manufacturers will want to protect
their leading edge type processes. This will allow that information
to remain between them and the designer.

It is also well known that there are 3 basic manufacturing processes.
Image, etch, and drill (4 really, including ML lay-up)
These are the basic process of the bare board only and don't include
silk and mask. Each of these are independent technologies and will
be kept and defined separately.

The designer will then determine if they wish to design a straight line
technology or a multiple-technology board.

Most of you have been designing for some time and this does not
appear a attractive aspect. Think of the newbies. This is the hardest
aspect for a new designer. Finding out what you have to work with.

Wish me luck,
Chris Robertson
[log in to unmask]
www.robertsondne.com
"The PCB Designer's Resource"

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