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!
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