Without seeing the actual gerbers I can't be 100% sure but more than likely his fab house added that annular ring in order to make it a plated hole. unplated holes cost more for some reason (probably the stencil costs) so board houses take your unplated holes and add a small annular ring in order to plate them. The lower prototype 'specials' usually don't allow unplated holes.
Does anybody know which fab house he used? p.s. This is why you should always review your gebers before you sent out your files. David Kelly wrote: > > On Fri, May 28, 2010 at 08:36:11PM -0000, James wrote: > > > > --- In [email protected] > <mailto:kicad-users%40yahoogroups.com>, Bernd Wiebus > <bernd.wie...@...> wrote: > > > > > > Hello. > > > > > > Sombody contacted me with a problem printing mounting holes at > > > KiCAD. He tries to make them as single round Pad with same drill > > > diameter and pad diameter, so the annular would be zero. But getting > > > this out, he got a very very thin annular at the cooper layers, > > > creating some trouble and rework. I do not really know, what he is > > > doing exactly, because i do not knew anybody else, who has the same > > > problem. > > > > How about drawing a crosshair or circle as a silkscreen object and > > using that to mark the drill? Could also just make the copper pad > > smaller than the drill bit used so that it vanishes entirely when the > > hole is drilled. > > Do that and you create a manual step for the board shop. Just asking to > increase cost and defects. > > Am still dabbling in KiCAD but with other tools I would put the drilled > hole on a layer dedicated to that purpose, a layer that does not print > on any of the copper layers. But a layer which is included when the > drill file is generated. Should also include your mounting holes layer > in DRC checking for your copper layers, just not in your final > production of gerbers for the copper. > > -- > David Kelly N4HHE, [email protected] <mailto:dkelly%40HiWAAY.net> > ======================================================================== > Whom computers would destroy, they must first drive mad. > > ------------------------------------ Please read the Kicad FAQ in the group files section before posting your question. Please post your bug reports here. They will be picked up by the creator of Kicad. Please visit http://www.kicadlib.org for details of how to contribute your symbols/modules to the kicad library. For building Kicad from source and other development questions visit the kicad-devel group at http://groups.yahoo.com/group/kicad-develYahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/kicad-users/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/kicad-users/join (Yahoo! ID required) <*> To change settings via email: [email protected] [email protected] <*> To unsubscribe from this group, send an email to: [email protected] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
