Board shops talk in ounces and we should also. I spec finished and min hole
plate.
Board shop figures out its on comp process to achieve product. IPC doesn't
pay for the boards, we do.
The more open it is for different fabrication processes the better (lower
cost). A good design rule
most have forgotten is the KISS rule. "Keep it Simple Stupid"


Randy Jackson
Design Center Manager
DFW Test Inc.
Phone (972) 231-1094
Fax (972) 231-1895

-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]]On Behalf Of
[log in to unmask]
Sent: Monday, April 29, 2002 12:17 PM
To: [log in to unmask]
Subject: Re: [DC] Clarification of Conductor Thickness Spec


Rodney & Randy & William-
Do you spec the finished copper in oz. or microns or inches? What you say
is the way I've always done it (spec. finished thickness + min plating in
holes), but am trying to devise a 'global' standard. Our French and German
divisions specify starting and finished copper in microns. IPC seems to say
you should call out a starting thickness (though maybe that's just for the
boardshops ordering the clad laminate) and a finished thickness.

Thanks a lot for taking the time to respond. I'd love to hear from someone
at IPC regarding 76uM as finished thickness for 2oz. base Cu after
plating...

William- Yeah, I started out talking about 2oz. finished, but got off track
looking at IPC-6012, where the final minimum thickness for 2oz+plating
equals a gnats a$$ more than base 2oz. I'm easily distracted.

-Chris



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