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January 2009

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Subject:
From:
Ioan Tempea <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Ioan Tempea <[log in to unmask]>
Date:
Thu, 29 Jan 2009 22:41:43 -0500
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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
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www.digico.cc <http://www.digico.cc/> 
P N'imprimer que si nécessaire - Print only if you must
 

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