--- In
Homebrew_PCBs@yahoogroups.com, "Stefan Trethan"
<stefan_trethan@g...> wrote:
> Since the shaft is usually standard size and thus much wider that'd
be
> very hard to do.
> However, the idea is good. I use a broken bit that did break 2mm
down the
> spiral part to enlarge/add holes free-hand. It didn't break again so
far.
> I think they'd last much longer if all bits were that short. I guess
the
> reason for long bits is many PCB houses drill stacks of boards at
once. If
> they break, they usually break right where the thin part starts,
only good
> to re-grind as scribe tips.
>
> Maybe one could strengthen the unused spiral part with epoxy or
something?
>
> ST
>
Maybe a little steel tube, like a seringe needle and some epoxy in it.
I will try this.
Adrian