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add cursed footprints
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carrotIndustries committed Oct 3, 2022
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32 changes: 32 additions & 0 deletions cursed-footprints.rst
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Cursed Footprints
=================

Complicated footprints, such as this `QFN <https://www.vishay.com/docs/75921/sic437.pdf>`_
can sometimes be challenging to draw, so here are some tips and tricks
to make your life easier.

Import the drawing
-------------------

Even though technical drawings are sometimes not to scale, there's a
good chance that they are, so it's worth trying to convert the drawing
to a bitmap image and import it using the "Place picture" tool. In this
particular case, I had to slightly adjust the aspect ratio for the
dimensions to be as specified in the drawing. While it's not
recommended to eyeball coordinates based on a bitmap image, it's a good
way to verify that one has correctly reproduced the drawing.

Converting polygon to pads
--------------------------

For pads that require custom polygonal padstacks, draw the copper layer
as a polygon and then use the "Convert to Pad" tool to convert the
polygon into a pad.

Snap to pad corners
-------------------

Often times, dimensions are specified between pad corners rather than
pad centers. To simplify measuring and setting the distance between pad
corners, enable the "Snap to pad corners" option in the "View &
Selection" menu.
1 change: 1 addition & 0 deletions index.rst
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Expand Up @@ -68,6 +68,7 @@ Take a look at the :doc:`top features <feature-overview>`, just :doc:`try it out
project-pool
pool-mgr
create-package
cursed-footprints
pool-contribute


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