kicad-developers team mailing list archive

[Cirilo Bernardo <cirilo.bernardo@xxxxxxxxx>]

For the first 2 links:  This shape cannot really be represented in kicad
except by cutouts - but we have no mechanism to separate plated from
non-plated cutouts. In the first link we cannot use simple slots to
represent this shape because the wider slot would have a large rounded end
which extends beyond the narrow slot, but in the case where the slots are
the same width I see no problem with allowing it since the designer may
actually want that. It will be up to the designer to check the final design
before production anyway.

For the castellated edge (amazonaws link), this is becoming more common. I
would expect the board edge to cut through the pads/holes in pads to
produce the expected castellation. It would also be good to have an option
to crop everything outside the board edge so that in files such as the
pic_programmer demo we do not have silk prints magically floating in the
air.

In your last link someone did a bad job of attempting a castellation. This
is not really a problem for kicad, it is a problem for the designers and
fabricators. The only bad geometry which I would not allow is a
cutout/drill hole which intersects the board outline at a single point or
one which intersects at two points to create two separate bodies. I would
not allow such geometry because it's an annoying case to handle even in
MCAD software and makes absolutely no sense from the manufacturing
perspective. In the case of not creating two separate bodies - kicad will
yield awful results in such a case anyway because it is somewhat inflexible
and requires a single body outline. This is one reason why I'd like to have
a 'board outline layer' and 'cutout layer' rather than the single 'edge
cuts' layer.

- Cirilo


On Sun, Jan 10, 2016 at 1:19 AM, Mário Luzeiro <mrluzeiro@xxxxx> wrote:

> Hello all,
>
> Related with the 3d-viewer refactoring,
> how is kicad handling this (subject) cases and how it should be
> represented?
>
> The question is, what is supported and should be correct represented and
> what is not supported and should be... correct represented.
>
> So, For example, if we do a t-shap castellated with segment pads, should
> the slot be subtracted or should 3d-viewer draw the two pads to user will
> know that there is something wrong there and will not be mistaked?
>
> http://www.hitech.com.mk/Resources/Images//PCB/Tech/t-14.JPG
> http://i.stack.imgur.com/qyvAX.jpg
>
> Another case:
>
> If a user make a plated hole but it is cut half by a cut-outline (a hole)
> how should it be represented?
> Should I draw the plated hole, or should I subtract the cut-outline to it?
>
> https://kicad-info.s3.amazonaws.com/286e33b6746414c43e274332cae0bb34de1693c4afb.jpg
>
>
> IMO, if it is allowed and the way to manufacture it, then I should make
> the "Boolean operations".
> If that is not allowed and not possible to manufacture. then I should not
> "make any operations" and show it as-is.
>
> So user will see in 3d-viewer that it does not look good:
> http://i.stack.imgur.com/OwZaI.png
>
>
> Also, what are the things you have in mind in future to support this cases
> (i.e.: is there anything I can do so it will work in future?)
>
> Thanks all!
> Mario Luzeiro
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