One cheat for when you do have a need for maximum copper around a
given hole, is to first under-size drill the hole, then etch it, then
finally drill it out to the correct size.  Guarantees that you'll have
copper right to the edge of the hole.  (Usually not a problem.)

  Mark, mwillis@nwlink.com

Mark A Moss wrote:
>
> Here's a method I have used to make single PC boards for projects.  I use
> a shareware layout program, Ivex's Winboard Demo, to do the layout.  I
> print a view of the copper side of the board and tape it down to the
> board stock.  I then use that as a drill template.  After the holes are
> drilled, I draw in the pattern, using a "sharpie" permanent black marker
> for the resist.  Then I etch.  I first thought I would have trouble
> because of the etchatent "eating" the copper at the sides of the drilled
> holes.  This would work OK for double sided boards too, as long as you
> had enough clearance to solder the lead on both sides of the boars.  I
> suppose this method would get a bit difficult for fine pitch SMD devices,
> though.
>
> Mark Moss
> Amateur Radio Operator, Technician, and General Tinkerer
>
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