Homebrew PCBs

This might sound a little naive, but I have big bit centering problems too.  I do etch the hole in the center of the pad, but when a carbide bit at 30K RPM hits the board it eats away everything in its way, no matter whether there a center hole or not.  Or you mean stopping the bit after every hole you drill?  Would work, but sounds a little unpractical.  Could anyone please explain?  

Thanks,
Fabio

--- In Homebrew_PCBs@yahoogroups.com, "Andrew" <a_wake@...> wrote:
>
> To expand a bit -- I am only familiar with KiCad, but would guess the others provide a similar option:
> 
> KiCad allows you to choose either an exact hole size or just a pin-point. The latter helps to avoid over-etching the hole, but still leaves a little point in the copper that will guide the drill bit.
> 
> --- In Homebrew_PCBs@yahoogroups.com, "Ben L" <bhleavi@> wrote:
> >
> > 
> > 
> > --- In Homebrew_PCBs@yahoogroups.com, rocko <sunblaster5@> wrote:
> > >
> > > After etching.
> > > How do you get the etch to make a hole?
> > >
> > 
> > Most all of the PCB Layout software programs has a center in the pad that you size to match the hole size you need for your component lead.  So when etched it etches the copper from the center of the pad.
> > 
> > Ben
> >
>