John,
Yes it does work for local fiducials just as well but not if the
fiducial is part of the actual part land pattern. Then again if the fiducial is
part of the land pattern you also don't get a listing and coordinates for those
local fiducials. We do all of our fiducials (local or global) as separate
components and then we get a complete listing of them in the PNP file. Just for
your knowledge as well, our local fiducials are 20mil diameter pads, uses less
room in critical locations. Maybe you may want to investigate that with your
assembly people, 40 mil fiducials are quite large if you have to use them for
local fiducials within the circuitry.
Various PNP machines are different as well but what we use are:
40mils round pads with 120mil soldermask relief for a global fiducial.
20mil round pads with 60mil soldermask relief for a local fiducial.
More recently we just got new PNP machines, they can seemingly use
almost anything (traces, corners, fills, through holes, cleared of soldermask,
under the soldermask, anything) as fiducials. This has meant we are typically
eliminating local fiducials as they are now totally redundant with these new
machines.
Sincerely,
Brad Velander
Senior PCB Designer
Northern Airborne Technology
#14 - 1925 Kirschner Road,
Kelowna, BC, V1Y 4N7.
tel (250) 763-2232 ext. 225
fax (250) 762-3374
-----Original Message-----
From: john bougs [mailto:[EMAIL PROTECTED]
Sent: Thursday, March 22, 2007 9:28 PM
To: Protel EDA Discussion List
Subject: Re: [PEDA] fiducials
Ian:
I was guessing something like that but hoped there was
some way to put it all right in the footprint. This
will do the job ... and in the end that's what counts.
Brad:
Your solution is what I initially tried. I works fine
for global fiducials, but does not work when you have
a local fiducial attached to a part.
The other thing I was thinking was to put a ring
around the the fiducial...but I think that might just
create different headaches.
thanks guys.
-
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