Metric is the way to go, especially if you are using 1mm pitch BGA, or
.8mm, easiest way to route is using metric, since most of today's
electrical components are now metric.
I you like making your job more complicated, I guess Inches will do that
for you.
My approach is as follows, if the majority of the components on the
board I'm working on are metric, then so is my design.
Inkra Networks
Patrick Jabbaz CID
Sr Board Layout Eng.
40971 Encyclopedia Circle
Fremont, CA 94538
Work (510) 249-4835
Mobile (408) 621-6533
[log in to unmask]
-----Original Message-----
From: Scott Riley [mailto:[log in to unmask]]
Sent: Friday, July 23, 2004 1:50 PM
To: [log in to unmask]
Subject: [DC] Inches vs Metric
This is something that will never go away. I used to work at a company
with
a standard that all drawings were to be dimensioned in MM. All our
designs
were done in microns, but the engineers all spoke in "mils". It made
for
interesting design reviews, but you eventually get used to it.
One of the first things I ask a new customer is what units they prefer.
If
it's inch I use line widths/spaces of 0.005, 0.010, etc. If they want
metric
I use 0.125, 0.25, etc. It's interesting to see how much "metric data" I
received with values of 0.381, 0.254, 0.762, 1.016.
Personally I prefer metric, but still buy beer buy the pint :)
Scott D. Riley
Technical Design Service
607-658-9322 - Office
607-785-1696 - FAX
<http://www.techdesignservice.com/> www.techdesignservice.com
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