Homebrew PCBs

OH, and I forget to mention also!

As you know, water and electricity make for nasty enemies!  
Depending on the helix angle of the drill (or other cutting tool) it 
may make for a pump to pull water up the tool and, with enough 
velocity, into the motor - that might cause some problems.

I would certainly do tests on a drill press first - water on the 
spindle won't hurt it like water in a dremel motor.

Chris





--- In Homebrew_PCBs@yahoogroups.com, "Stefan Trethan" 
<stefan_trethan@g...> wrote:
> On Sun, 24 Jul 2005 14:58:24 +0200, lcdpublishing  
> <lcdpublishing@y...> wrote:
> 
> > Hi Stefan,
> > The process of drilling metal under water I have done in the 
past -
> > usually with very hard steels and at very slow spindle speeds.
> > FOr PCBs, there could be a big problem though.  When drilling, 
the
> > material may create a chip that is a "long string" which could 
fling
> > the water all about your shop.  I have not drilled enough PCB
> > material to know how the chips develope and break so I am unsure 
of
> > this.
> 
> 
> Well, most seems to be fine dust when drilling in air.
> But sometimes fibers seem to stick together and accumulate on the 
drill.  
> It isn't very strong fibers and i don't think it could stay at the 
drill  
> in water (drag), it comes off very easily when drilling in air.
> 
> Easy enough to try out with a small water container and the drill 
press.
> 
> thanks
> 
> ST