I've only had that problem when I chose drill sizes too large for pads which were simply too small and should have been larger.
It's more likely the drill will break toner off and cause problems when etching.
If you print out your pads with the drill hole, that part is etched anyway, so when you drill you are actually only drilling the substrate and not copper.
Just my observations at least!
--- In Homebrew_PCBs@yahoogroups.com, Derek <derek@...> wrote:
>
> I would suggest to drill before etching. This way less chance of a snag
> on the pad and pulling the copper off. Run the drill with a high speed
> and drill slowly.
>
> There are places you can order up small drill bits as well -
> mcmaster.com for one.
>
> Derek Koonce
> DDK Interactive Consulting Services
>
>
>
>
> On 10/17/2011 1:21 PM, pebo festus wrote:
> >
> > when i visit the dentist i ask for all his used drills, they make some
> > quite small.
> >
> > ________________________________
> > From: Chuck <c.knight@... <mailto:c.knight%40juno.com>>
> > To: Homebrew_PCBs@yahoogroups.com <mailto:Homebrew_PCBs%40yahoogroups.com>
> > Sent: Saturday, October 15, 2011 8:13 PM
> > Subject: [Homebrew_PCBs] VERY FIRST PCB -- SUCCESSFUL!!!
> >
> >
> > I just made my very first PCB at home!!! Hooray!
> >
> > http://www.instructables.com/id/Easy-to-build-CNC-Mill-Stepper-Motor-and-Driver-ci/
> > I made the "Easy Stepper" board from Instructables, and could not
> > easily get etchant out where I live, so I used the toilet bowl
> > cleaner/peroxide mix. Worked quite well, actually.
> >
> > And, I did it as LASER toner transfer, using magazine paper. Talk
> > about low tech!
> >
> > Apparently it really ∗is∗ possible to make boards, at home, and
> > affordably. Next step is going to be drilling them out.
> >
> > I have 1/16" drill bits that would fit my drill press, or my
> > Dremel...and I have a 0.7mm solid carbide bit that fits either as
> > well. My concern is runout and precision...carbide is very VERY
> > brittle, and I have only one bit.
> >
> > Any hints for a first timer?
> >
> > THANKS!
> >
> > Chuck
> >
> > [Non-text portions of this message have been removed]
> >
> >
>
>
> [Non-text portions of this message have been removed]
>