According to the PCB Matrix Forum, PCB Matrix are in the process of adding
Rounded Rectangular Pad Shape as the new RoHS standard pad shape for every
SMT component land pattern.
I'm a PADS user. To the best of my knowledge, Rounded Rectangular is not an
available FLASH pad shape option in PADS. If I had to make one today, I'd
shorten the former "Rectangular" pad appropriately, and append associated
copper to create the rounded corners as required by the new land patterns.
I can't speak for the other toolsets but this may be good job security,
perhaps?
===========================
Gary M. Koven, C.I.D.
Dynazign, Inc.
Charlotte, NC, USA
Veteran of the Marsh School
________________________________________
From: Robert Pellerin - Paradox Innovation [mailto:[log in to unmask]]
Sent: Friday, January 30, 2009 10:51 AM
To: [log in to unmask]
Subject: Re: [DC] Aperture generation in gerber files
Maybee the new ODB++ file specification can fix that issue, but we still far
from the solution, at least from the software implementation.
Robert Pellerin, B.A.A., C.I.D.
PCB Designer / Paradox Innovation Ltd.
________________________________________
De : DesignerCouncil [mailto:[log in to unmask]] De la part de Ioan
Tempea
Envoyé : 30 janvier 2009 10:38
À : [log in to unmask]
Objet : Re: [DC] Aperture generation in gerber files
Thanks to all that responded, now things are clear.
Globally thinking, most assemblers do not pay for gerber editors and rely on
free viewers for reading the files. Quite often we need to measure things in
order to figure out editing of paste files (especially when using intrusive
soldering), or if the fiducials are not in the CAD file and we need to
figure out their position, etc.
So, to answer Robert, yes you are right, the fab does not need them, but the
assemblers do. And mainly because we need to stuff boards from many various
designers, with different design styles and conventions and with many gray
spots in documentation.
Regards
Ioan Tempea, ing.
t : 450-967-7100 ext : 244
[log in to unmask]
www.digico.cc
P N'imprimer que si nécessaire - Print only if you must
________________________________________
De : DesignerCouncil [mailto:[log in to unmask]] De la part de Robert
Pellerin - Paradox Innovation
Envoyé : 30 janvier 2009 10:23
À : [log in to unmask]
Objet : Re: [DC] Aperture generation in gerber files
The FLASH or DRAW selection is controled by the software and we have no real
control over that. In the past with few softwares, like PCAD for DOS, it was
possible, but now, it seems useless for PCB fabrication to specify on
instead of the other.
Robert Pellerin, B.A.A., C.I.D.
PCB Designer / Paradox Innovation Ltd.
________________________________________
De : DesignerCouncil [mailto:[log in to unmask]] De la part de Ioan
Tempea
Envoyé : 29 janvier 2009 22:42
À : [log in to unmask]
Objet : [DC] Aperture generation in gerber files
Dear Colleagues,
The many gerber files I have seen can be divided into two categories,
according to how the geometrical figures (apertures) of the land patterns
are generated:
o Apertures declared as stand alone geometrical figures (e.g. a
rectangular 100x200 pad is declared as a 100x200 rectangle)
o Apertures generated by successive positions of a smaller element
(e.g. 100x200 rectangle generated by adjoining twenty 100x10 lines)
The second version does not come handy at all when trying to measure the
center of an aperture with a gerber viewer.
Questions:
o How is each of them generated?
o Are there CAD systems that can only generate the latter?
o Any precautions that can be taken by the designer so that only the
first one be generated?
o If I want to call each method by its technical name, what would
that be?
Thank you,
Ioan Tempea, ing.
Ingénieur Principal Fabrication / Sr. Manufacturing Engineer
30 ans déjà! - Already 30 years!
950 rue Bergar, Laval, Québec, H7L 5A1
t : 450-967-7100 ext : 244
Mtl : 514-990-5762
f : 450-967-7444
[log in to unmask]
www.digico.cc
P N'imprimer que si nécessaire - Print only if you must
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