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<title>EAGLE Help: Aperture Wheel File</title>
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<i>EAGLE Help</i>
<h1><center>Aperture Wheel File</center></h1>
<hr>
A photoplotter usually needs to know which <i>apertures</i> are
assigned to the codes used in the output file. These assignments
are defined in an <i>Aperture Wheel File</i>.
<p>
<b>Examples</b>
<pre>
D010 annulus 0.004 x 0.000
D010 round 0.004
D040 square 0.004
D054 thermal 0.090 x 0.060
D100 rectangle 0.060 x 0.075
D104 oval 0.030 x 0.090
D110 draw 0.004
</pre>
Note that the file may contain several apertures that share the same D-code,
as long as all of these have a type from draw, round or annulus, and have
the same size (in case of annulus the second size parameter must be 0 in such
a case). This can be used to map apertures that effectively result in the
same drawing to a common D-code.
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