User Guide

InfoFile
The apertures which have not been found are then listed in the file
name.gpi, where name here stands for the name chosen for the output
file.
You can then change your board in such a way that the existing aper
-
tures can be used. After generating plot or drill files you should always
checktherelatedinfofiles.
ApertureEmulation
If objects exist in a drawing which are not compatible with the available
aperture sizes, it is possible to emulate the desired dimensions by select
-
ingthe EmulateApertures option.
The CAM Processor then selects smaller apertures to emulate dimen
-
sions which are not matched by aperture sizes. The file name.gpi indi
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catestheneedforemulationandwhichaperturesmustbeemulated.
Thermal or annulus apertures are only emulated with draw apertures if
the Emulate Thermal or Emulate Annulus options, respectively, are
activated.
Note: emulation results in longer plot times and higher costs, so it
shouldbeavoidedwheneverpossible.
Aperture Tolerances
If you enter tolerances for draw and/or flash apertures, then if the aper
-
ture with the exact value is not available the CAM Processor will use ap
-
ertures within the tolerances. Please bear in mind that your Design
Rulesmightnotbeobservedasaresultofallowingtolerances!
Refertofile name.gpi fortolerancesused.
DefiningtheApertureConfiguration
The CAM Processor distinguishes DRAW apertures from FLASH aper
-
tures. The first type is used to draw objects (e.g. tracks). The second
type is used to generate symbols (e.g. pads) by a light flash. Only if
draw apertures are defined can the plotter draw lines. Therefore, if the
plotter doesn’t distinguish between draw and flash apertures, you must
additionallydefineroundoroctagonalaperturesasdrawapertures.
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EAGLEManual