=20

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On my latest board for production, the vias are 0.3mm, some 2-pin
connectors are 1mm holes, some RJ45's are on 0.9mm holes for the pins
and the trace widths vary from 0.25mm to 0.8mm and there's a ground
plane flood on both sides.=20

	I guess it depends upon what your PCB manufacturer can do as to how
small you can go, and it's down to whoever is making the board how
big you can go before things start
 to fall out.=20

	There's only SMT devices and PTH connectors on this board, so I
can't tell you how big the holes would be for example for a 16 pin
PDIP part. =20

	Can I ask why you are designing your own PCB software when there are
so many good free apps out there?=20

	-Jim
 On Tue 19/06/12 7:45 AM , David lists@edeca.net sent:
  On 18/06/2012 14:35, Electron wrote:
 > I wonder if, to make for best results, should I make the holes
larger than
 > normal, else the tin won't be able to reach the opposite side of
the PCB?
 Most PCB manufacturing companies will take your gerber/drill files
and=20
 make holes of the requested size after plating. So if your tool size

 says 2mm then it will be a 2mm hole after it has been plated. There
are=20
 a few weird exceptions (Olimex come to mind).
 There is no reason I see to make holes bigger than you need, so long
as=20
 components aren't forced into tiny holes. Depending on the finish
you=20
 don't want to ruin the through plating when reworking parts.
 For an obvious example of small holes just think of vias. I have
been=20
 using 13mil vias on recent boards which are by design through
plated.
 David
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