Re: gEDA-user: dxf again

[Dave N6NZ <n6nz@xxxxxxxx>]

On Jul 16, 2010, at 7:17 AM, Armin Faltl wrote:

> 
> Dave N6NZ wrote:
>> But my application is a little different.  I want to get a DXF file that I can run through a CAM package, in particular the paste layer, which isn't a 'real' layer, unfortunately -- it is synthesized in the output HID as I understand it.
> I somehow feared this while I wasn't sure: so it is not posible to manually define the paste mask on a footprint?
> If it's possible, how?
> I need this to create the footprint of a part with thermal central pad. The manufacturer recommends the mask
> should cover 55-70% of the central area while near 100% of the electrical pads are to be covered with paste.
> The industry std-solution is to "grid hatch" the large continuous areas which also helps to keep the paste in place.
> Hand-soldering is a nightmare-option with 0.5mm pad-pitch ;-)
> Is it possible to define an offset to the copper area per pad?

pcb footprints don't directly support that kind of complex solder mask.  You might be able to employ some trickery by making the large pad out of an array of smaller pads with appropriate mask definitions and all with the same pin number.  Kinda clunky.

-dave

> 
> If nothing else helps, how difficult would it be, to just create an attribute that triggers a stub that fetches
> and inserts a handcrafted gerber-snippet from a file instead of running the generator?
> 
> Thanks in advance, Armin
> 
> 
> _______________________________________________
> geda-user mailing list
> geda-user@xxxxxxxxxxxxxx
> http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
> 



_______________________________________________
geda-user mailing list
geda-user@xxxxxxxxxxxxxx
http://www.seul.org/cgi-bin/mailman/listinfo/geda-user