Re: gEDA-user: PCB square pin suggestion

[Xtian Xultz <xultz@xxxxxxxxxxxx>]

Thanx a lot for the information! 

Em Dom 02 Abr 2006 22:03, DJ Delorie escreveu:
> > Why?
>
> It may keep a polygon island from getting disconnected or necking down
> below DRC parameters.  It may allow for an extra trace between pins.
> If the pin is intersected by a 45 degree line, it prevents notches
> from being cut out of the clearance:
>
> http://www.delorie.com/pcb/notches.html
>
> It does get ugly when you have a row of square SMD pads, though.  You
> end up with lots of little triangles cutting into an otherwise
> straight clearance edge.  I think, if we decided to use rounded-corner
> clearances, we'd need to be intelligent about rows of pads with
> overlapping clearances, and join them into a single rounded-corner
> clearance that covered them all.  That might speed up display and
> reduce gerber file sizes, too, even if we implemented it for
> square-corner clearances.