Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

I was thinking that it might be possible to arrange a several turn
spiral of flexible tubing submerged about 90 percent ( a slow spiral
ramp) slide a smaller air pump tubing inside it and pump echant and
air at the same time to flow over suface of ecthed board horiz. face
up
The airbubbles start about middle lenth of the larger tube
another tube placed inside the main tube could contain resistors in
oil
as a heater.
I was looking at the cnc hardware group but after registering I am
now
blocked not sure what the problem is. I am planning to build a drill
or pcb engraver out of junk printer parts thanks luther