At 04:08 PM 5/17/01 -0400, Richard Sumner wrote:
>Alas, the aperture limit is not available if you choose rs274x.
>Not all pcb houses can manage large "apertures". Advanced circuits is
>limited to 1"x1", for example.
Usually such large apertures are created by fills. Protel had a bright idea
to save gerber file size by flashing fills with an aperture created just
for the fill, instead of drawing it with a square aperture.
There is a problem with this, besides the problem which is being discussed:
When the fill is reimported, Protel treats it as a pad.
Protel, instead of flashing fills, they should be drawn with a maximum size
square aperture (I won't define maximum here). Protel does not draw with
square apertures, as far as I know. This would allow recreation of the fill
as a fill when importing Protel-generated gerber. A square fill would be
drawn as a line with endpoints equal. (That works in gerber; it is
equivalent to a flash). And it should be possible to set a maximum aperture
size for RS-274X output.
A workaround, if one wants to use RS-274X, which is recommended, would be
to replace fills larger than the maximum aperture size with a set of fills
of the maximum size, 1 inch square would be very convenient if one is
working on an inch grid, otherwise I'd choose a fill of 2 mm square.
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