Steve -
It is difficult (read as nearly impossible and highly improbable) to
generate a cost matrix for PCB/PWB if you work with more than one
fabricator. The cause for this is the large number of variables involved.
Some of the variables are the technology used in the design, market demand
at the time of order, materials, time to delivery, quantity, etc. Each of
the fabricators that I work with has a different calculator for determining
the prices of a given design, their NRE, and additional charges for testing
and shipping. Generally the variation in price is only a few hundred dollars
US , but I have seen variations in the cost quoted for a single design as
great as $10000us. Additionally, factors like the guarantee of follow on
production orders which can skew these numbers even more.
So much for the bad news, now for the tirade against bean-counters... >:^>
New technology *may* cost more than someone guessed in the planning
meetings, but it may be the only thing that allows you to meet schedule and
operational requirements set for the product. If you involved the designers
in the up-front planning of a new product development project, not after the
schematics and primary components have been selected and purchased it might
be possible to direct the project in to a less costly technology. To many
times I have seen the lead EE select a component because it is the "latest
and greatest" thing on the market, only to find out that it will push the
limits of layout and fabrication technology. Designers tend to be
conservative in our approach to development, we normally want to stay away
from the *bleeding edge* of our and our fabricators capabilities to
guarantee a successful design.
It may also be useful to look at cost effectivity of moving to a more
advanced design rule set, over the time involved in using a *less* expensive
technology. I often find that a savings of 1 or 2 man-weeks of my time far
exceeds the cost of the technology in the run of a small project.
Sorry - sore subject,
Jeffrey A. McGlaughlin CID
Sr. Designer
Battelle Memorial Institute
Columbus Ohio
[log in to unmask]
-----Original Message-----
From: Stephen Brown [mailto:[log in to unmask]]
Sent: Wednesday, October 10, 2001 9:35 AM
To: [log in to unmask]
Subject: [TN] Raw Card Cost Matrix.
I'm trying to design a costing matrix for raw cards so our designers can
estimate the costs of their raw card designs, this will hopefully slow
down their lust for technology and get them considering project budget
costs. Does anyone know of where I can access this information so I know
a basic cost / sq. inch and then add percentage costs for extra layers,
different surface finishes, impedance control, extra drilled holes and
if I use buried via's. Any information will be gratefully received.
Thanks.
Steve Brown.
Xyratex.
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