kicad-lib-committers team mailing list archive

[Carl Poirier <carl.poirier.2@xxxxxxxxx>]

About these rules for the silkscreen, are they only for SMD? I am under the
impression it does not apply well to THT components, for example an
electrolytic capacitor where we often see a circle with one half full to
indicate polarity. This would be partly hidden once the board is assembled.


On Thu, Jun 5, 2014 at 5:24 PM, Bernd Wiebus <bernd.wiebus@xxxxxx> wrote:

> Hello Pawel.
>
> Am Montag, den 02.06.2014, 09:57 +0200 schrieb Paweł Dras:
>
> > With pads over the silk is the same situation, in many cases after
> > silk erasure by solder mask it don't looks good on final product.
>
> It is not only about "looking good". Silkscreen print over Pads is
> nasty, if someone forgets to distract the pads from the silkscreen.
> It may be expensiv, but shure will cost time at last.....
>
> If you place your silksceen across pads, and erase it over the pads,
> your silkscreen will be chopped. so better you chopp it by yourself and
> make it looking good.
>
>
> > Another problem is to wide placed silk.
>
> Think about, that you perhaps need place for rework tools.
> And wave soldering needs more space around the devices than reflow.
>
> Some years ago, KiCad insisted in thik lines, because you could not
> change the wide of silk screen lines. Of course, it was possible by
> editing the library file by hand.
>
> But this thick lines are sometimes needed, because a manufacturer who
> use a real silk-screen printing process and not a optical process, meeds
> the wide lines.
>
> So bee careful, if you use thin lines. Think about the spacing.
>
> > I have a question, can be ref and value placed as in my attachment or
> > should  be above and below resistor?
>
> It is a bad idea, to place text under devices, because it cannot be read
> anymore, if the device is once mounted......so i put text to this
> positions, only if there is nowhere a better place for the text.
>
> Personally, i switch the value at layouts and silkscreens to invisible,
> and keep only reference as a designator.
>
> Having reference AND value at the layout costs place and is terrible to
> read. So better i use only the reference, and the BOM of course. ;O)
>
> For big boards with few devices, it migt be ok to have both, but for
> growing sisze, it will get diffcult to read.
>
> the exeption is, if you use the silk-screen not as an silk-screen at the
> board, but as an assembly layer. So you are not stuck to board
> dimensions, but can make DIN A2 prints for boards the size of a small
> stamp. ;O)
>
> With best regards: Bernd Wiebus alias dl1eic
>
>
>
>
>
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