Pedro, I'm not an expert on manufacturing pcbs, but I'm guessing that the default spacing of 0.010" was picked because it is typical of the capability of mfrs. The IC that I'm using specifies a spacing of 0.000984" which gets rounded in PCBnew to 0.001". I don't know if this creates a problem for my mfrs., but would prefer to keep the default spacing where not needed and only require tighter tolerance where it is specified. Any thoughts on this? Your thoughts on this would be appreciated.
Regards, Doug --- In [email protected], Pedro Martin <[EMAIL PROTECTED]> wrote: > > Hi Doug, > > Why edit every pin each time you use the IC? > > The only 2 parametres needed are "clearance", i.e. minimum gap between tracks > and so, and "mask clearance" for minimum solder gap. > > Since these 2 parametres depend on the manufacturer technology, it is > reasonable to think they shoul be unique for the whole pcb. > > The only possible case for specific pad editing is the case that the pad metal > area should be bigger than the solder paste area. And this is an unusual > case. > > For BGAs I have used a round one side pad, no problem at all. In this case I > set the mask clearance to 0.0991 mm or 0.0039 inch. > > Regards, > Pedro. > > > This seems to be a poor way to do this since any time I use this IC I > > will have to manually edit each pin. Â Luckily this particular one only > > has 4 pins. Â And since there is no way to visibly detect changes in > > PCBnew you have to check each pin in a Gerber viewer. > > > > Since you have both done this, what is your opinion on how a fix > > should be implemented? Â I think the module editor should implement > > this. Â I initially was thinking that the editor should just allow you > > to change the mask clearance. Â But I am wondering if also allowing > > another type of pad "BGA" would make better sense. > > >
