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Re: gEDA-user: bottom side pad only in PCB



Olgierd,

I also make boards with transfer film using PCB and try to maximize the use of DIP pins and
other thru hole devices to route signals from top to bottom.

I wrote a utility to:
    1. scrub pins on the top side that have no trace connected to them (cleaner looking dill)
    2. print a board outline ~0.5 cm greater than the actual board size
    3. print targets for aligning the two films.

George

On Mon, 2005-07-25 at 18:35 +0000, Olgierd Eysymontt wrote:
Yes Harry, that's what I do, but sometimes it's not possible to route on
only one side, so I make double sided boards, and in that cases, I have
to route by hand the upper side (bacause PCB will try to attach to the
pins thinking I have Plated Trough Holes), anyway it's not a big job as
PCB do the most on the solder side, but would be nice that PCB could do
the full job as the toner transfer method is really cheap, fast and
good, I make traces of 10 mils without problems and take no more that
1-2 hours to have a small board ready (even drilled), so I use it a lot.

Thanks

Olgierd



On Mon, 2005-07-25 at 18:23 -0400, harry eaton wrote:
> The auto router only routes on visible layers. Simply turn off visibility of
> all but the solder layer
> before running the auto-router, and it will only route on the solder layer.
> 
> h.
> 
> 
> ----- Original Message -----
> From: "Olgierd Eysymontt" <olgierd.eysymontt@xxxxxxxxxxx>
> To: <geda-user@xxxxxxxx>
> Sent: Monday, July 25, 2005 7:25 AM
> Subject: Re: gEDA-user: bottom side pad only in PCB
> 
> 
> > Another case of the no component side pad is when you make boards at
> > home (with the toner transfer method for example) and don't have PTH,
> > like most components can't be soldered on top, you have to route the
> > component side by hand while the solder side is done automatically by
> > PCB. If there would be an option to avoid the auto router to connect to
> > the pins in the component layer it would be great and unique.
> >
> > Thanks for such a good software,
> >
> > Olgierd
> > http://www.tea-tec.cl
> >
> > On Sun, 2005-07-24 at 23:47 -0400, Dan McMahill wrote:
> > > Thanks harry!  Both of these suggestions should work fine.
> > >
> > > -Dan
> > >
> > > harry eaton wrote:
> > > > Dan,
> > > >
> > > > Let's start by assuming you can tolerate a tiny annular ring on the
> top
> > > > side. If so, then make the pins have a miniscule annular ring and
> place SMD
> > > > pads over them on the back side; use identical pin numbers for the
> pads and
> > > > pins that are coincident.
> > > >
> > > > If you can't tolerate plated holes, then simply make SMD pads on the
> back
> > > > side and make pure "mounting" holes for the pins to feed through.
> > > >
> > > > Either of these is fully supported with the current pcb code.
> Eventually we
> > > > could have the pin annular ring have per-layer size.
> > > >
> > > > h.
> > > >
> > > > ----- Original Message -----
> > > > From: "Dan McMahill" <dan@xxxxxxxxxxxx>
> > > > To: <geda-user@xxxxxxxx>
> > > > Sent: Sunday, July 24, 2005 10:17 PM
> > > > Subject: gEDA-user: bottom side pad only in PCB
> > > >
> > > >
> > > >
> > > >>anyone ever have to deal with a part which is leaded but only wants a
> > > >>solderside pad in PCB?  I think it just doesn't do it currently.
> Anyone
> > > >>have a workaround until I can get time to fix this?
> > > >>
> > > >>Thanks
> > > >>-Dan
> > > >>
> > > >>p.s.  Think metal package parts...
> > >
> >
> >
> >
> > --
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> >
>