Re: gEDA-user: Silkscreen over pads again

[Levente <leventelist@xxxxxxxxx>]

On Thu, 17 Jan 2008 11:47:37 -0800
"joe tarantino" <joeft@xxxxxxxxxxxxx> wrote:

> On Jan 17, 2008 11:01 AM, Levente
> <leventelist@xxxxxxxxx> wrote:
> 
> > On Thu, 17 Jan 2008 12:38:08 -0500
> > Dan McMahill <dan@xxxxxxxxxxxx> wrote:
> >
> > > DJ Delorie wrote:
> > > >>>  This was fixed at one point, such that pcb itself would remove
> > > >>>  the silk over pins and pads, but I haven't migrated that code
> > > >>>  into the HID version yet.
> > > >
> > > > We changed our minds about this.  We changed PCB so that it showed
> > > > silk over pads if that's what your design calls for, so if you see
> > > > silk over pads on the screen, you'll get silk over pads on the board.
> > > >
> > > > The magic we chose to go with to deal with the fabs that can't handle
> > > > cuts is to convert all cuts to multiple polygons instead, so that we
> > > > never have to use cuts or negative layers.  That was what we used to
> > > > remove the silk, and too many fabs didn't like it.
> > > >
> > > > Which fab is it?  Are they unable to fix the problem themselves?
> > >
> > > A DRC check for silk on pads would probably be good.  In my past life,
> > > we always had in house reviews of the gerbers and weren't allowed to
> > > send them to a board vendor until there was no silk on the pads
> >
> > Yes. In the other hand however, it may be good to have code in PCB that
> > optionally removes silkscreen from pads. For an example, please see this
> > photo. What you can see is a power transistor, and a thermo-resistor.
> >
> >
> > http://logonex.eu/gallery/tns/c4.html
> >
> > Best wishes,
> >
> > --
> > Levente
> > http://web.interware.hu/lekovacs
> >
> > I also believe that it would be good if PCB could remove overlapping
> silkscreen although the fab house I've used seems to be able to do it
> themselves.
> 
> I don't get the picture.  It looks like a power transistor and a diode, and
> I don't see obvious silkscreen overlap.

Imagine, that a thermo-resistor (wich you spot as a diode) has silkscreen. The
transistor with DPAK has a large cooling pad. I had to scretch the silkscreen
from the pad to be able to solder the transistor properly.


--
Levente
http://web.interware.hu/lekovacs



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