Re: gEDA-user: solder mask on polygon

[Stefan Salewski <mail@xxxxxxxxxxxx>]

On Sun, 2009-04-05 at 02:44 +0000, Kai-Martin Knaak wrote:
> On Sat, 04 Apr 2009 22:04:53 -0400, gene glick wrote:
> 
> > Can I turn off the solder mask on a rectangle or polygon? 
> 
> 
> Unfortunately, there is no way to draw inverted polygons in the solder 
> mask. This has been talked about on the list. But nobody stood up to add 
> this feature, yet.
> 
> My (dirty) workaround is to create footprints with zero width lines. 
> After these are converted to zero width pads, I set their mask clearance 
> to some large value. With the square flag set it will induce a 
> rectangular hole in the solder mask.
> 
> My fab didn't complain about the zero width pads in the gerbers. I guess, 
> they are used to such tricks. The pcb was produced fine with the expected 
> holes in solder mask.  
> 

Are you really talking about "draw inverted polygons in the solder 
mask" or do you mean inverted polygons in the copper.

The later would be indeed very nice, and I can remember talk about this
on this list. But inverted polygons in the solder mask -- I have no idea
for which we need this. We have this for pins and pads. Why would you
want to remove solder resist from other areas of the pcb. For gang
solder mask, to ensure that there is no solder resist between adjoining
pads?





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