Mail Archives: geda-help/2016/12/16/17:06:18
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| Date: | Fri, 16 Dec 2016 17:05:11 -0500
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| To: | geda-help AT delorie DOT com
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| From: | rickman <gnuarm DOT geda AT arius DOT com>
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| Subject: | Re: [geda-help] Orientation of components in X-Y (centroid)
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Don't ever assume the assembly house will fix a bad XYRS file. I had
an error in this data for IC packages which were *very* clearly
marked on the silkscreen and they assembled them all wrong on that
side of the board.
For devices where pin 1 is on a corner, I believe the convention is
for pin 1 to be in the upper left quadrant at 0 degrees. For
components with a single row of pins, the pin 1 should be to the
left. The orientation for parts on the bottom of the board should be
as viewed through the board from the top. Rotation is
counterclockwise for top side components and clockwise for bottom
side components.
From http://circuitsassembly.com/blog/?p=1787
"IPC says that zero orientation for two pin passives is horizontal,
with pin one on the left. For polarized capacitors, pin one is (+).
For diodes, pin one is the cathode. They note that pin one is always
the polarity mark pin or cathode. Pin one is also on the left for
resistors, inductors and non-polarized capacitors"
Here is a more complete reference...
https://www.screamingcircuits.com/assets/pdfs/understanding-the-centroid.pdf
Make sure you download this file directly from Screaming Circuits as
they had produced an older version of the file that had the rotation
info wrong. It may still be available from some places on the web.
Rick
On 12/16/2016 4:10 PM, DJ Delorie wrote:
>This is something typically "fixed" by the assembly houses that know
>which way the parts are on the tape and reel, but...
>
>PCB uses pin 1 (and sometimes pin 2) to determine the angle. IIRC there
>are specs for how to determine angle too, but I don't remember what they
>are.
>
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Don't ever assume the assembly house will fix a bad XYRS file. I
had an error in this data for IC packages which were *very* clearly
marked on the silkscreen and they assembled them all wrong on that side
of the board. <br><br>
For devices where pin 1 is on a corner, I believe the convention is for
pin 1 to be in the upper left quadrant at 0 degrees. For components
with a single row of pins, the pin 1 should be to the left. The
orientation for parts on the bottom of the board should be as viewed
through the board from the top. Rotation is counterclockwise for
top side components and clockwise for bottom side components. <br><br>
From
<a href="http://circuitsassembly.com/blog/?p=1787" eudora="autourl">
http://circuitsassembly.com/blog/?p=1787<br><br>
</a>"IPC says that zero orientation for two pin passives is
horizontal, with pin one on the left. For polarized capacitors, pin one
is (+). For diodes, pin one is the cathode. They note that pin one is
always the polarity mark pin or cathode. Pin one is also on the left for
resistors, inductors and non-polarized capacitors"<br><br>
Here is a more complete reference... <br><br>
<a href="https://www.screamingcircuits.com/assets/pdfs/understanding-the-centroid.pdf" eudora="autourl">
https://www.screamingcircuits.com/assets/pdfs/understanding-the-centroid.pdf<br>
<br>
</a>Make sure you download this file directly from Screaming Circuits as
they had produced an older version of the file that had the rotation info
wrong. It may still be available from some places on the web.
<br><br>
Rick<br><br>
<br>
On 12/16/2016 4:10 PM, DJ Delorie wrote:<br><br>
<br>
<blockquote type=cite class=cite cite=""><pre>This is something typically
"fixed" by the assembly houses that know
which way the parts are on the tape and reel, but...
PCB uses pin 1 (and sometimes pin 2) to determine the angle. IIRC
there
are specs for how to determine angle too, but I don't remember what they
are.
</pre><font face="Courier New, Courier"></font></blockquote><br>
</body>
</html>
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