Jeremy,
Forgive me if I should already know this from a previous request.
Which THP system do you use? Which supplier for your chemicals?
Thank you in advance,
Ballendo
--- In Homebrew_PCBs@yahoogroups.com, "Jeremy Taylor" <jt@j...> wrote:
> Sharpie will do FeCl as long as you get a good solid coat of it on
there.
> And make sure not to over etch.
>
> This next part is debatable. but IMO drilling first before etch can
lead to
> under cutting around the pad, leaving a small circle on the inside
of the
> pad that will be non conductive. this may or may not be a problem,
being
> your first board, probably wont be. as you can goop a big solder
bogey over
> the pad and all is well, - but not pretty.
>
> I personally always dill before etch, but I use a completely
different
> process, which includes, plating the holes, and using plated tin as
the etch
> resist.
>
> ----- Original Message -----
> From: "mr_gees100_peas" <geovar13@h...>
> To: <Homebrew_PCBs@yahoogroups.com>
> Sent: Wednesday, March 24, 2004 10:01 AM
> Subject: [Homebrew_PCBs] to drill or not to dril?
>
>
> >
> > Hi I've ben reading this group for a while and I feel
confident
> > enough to make my firt PCB. I decided to use the PnP transfer
paper
> > and iron it on. Right now I manage to transfer my design to a
copper
> > bard fairly well. The thing is that I see all those holes and they
> > are so smal. I hear some people drill the holes after they etch
> > becase they can use the hole as a guide. Well, I tried driling a
few
> > holes in a practice pice of copper board nd I keep missing the
mark.
> > The board an't een etch yet but I wondering if I should drill the
> > holes fist that way I can add more resist in case I screw up.
> >
> > My second question is about sharpie pen. When I was
transfering my
> > desing a few pads and trces did not transfer properly. I took a
> > sharpie pen and fille in the missing gap. Will the sharpie resist
> > ferric cloride or will it fail?
> >
> >
> >
> > Be sure to visit the group home and check for new Bookmarks and
files:
> > http://groups.yahoo.com/group/Homebrew_PCBs
> > Yahoo! Groups Links
> >
> >
> >
> >
> >