Homebrew PCBs

--- 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