Chris,
Don't reinvent the wheel.
There are IPC survey's that can be downloaded for free @
http://www.ipc.org/
look under the on-line resources & databases and then IPC Documents
available for download.
IPC-1710
OEM Standard for Printed Board Manufacturers' Qualification Profile
Developed by the OEM council of the IPC, the MQP sets the standard for
assessing PWB manufacturers capabilities and allows PWB manufacturers to
more easily satisfy customer requirements.
&
IPC-1720
Assembly Qualification Profile

Developed by the OEM council of the IPC, IPC-1720 categorized an electronic
assembly manufacturer's capabilities and supplies the OEM customer with
detailed, substantive information

-----Original Message-----
From: Chris Robertson [mailto:[log in to unmask]]
Sent: Friday, March 09, 2001 12:41 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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