Homebrew PCBs

On 12/11/2014 10:28 AM, Slavko Kocjancic eslavko@... 
[Homebrew_PCBs] wrote:
> I saw few attempts too.
> Well wraping pcb to drum is near inposible.
> Hello--
I dimly recall that many years ago a company manufactured a drum-based 
PC-board engraver
(or perhaps "carver" would be more appropriate. The system used very 
thin copperclad
board that wrapped around the drum.

A horizontal carriage moved the carving head in parallel with the drum's 
axis, and a solenoid
moved the carving bit into (and out of) the copperclad board.

Again, I very dimly recall that the carving bit moved under the control 
of a black-and-white
image of the desired traces-- likely using a photoelectric sensor of 
some sort? if
you've seen a pattern-tracing wood lathe in operation, you'll have a 
better idea of
how the machine worked.

When the copperclad board was finished, the user affixed the board to a 
thicker piece
of epoxy-fiberglass (unclad) board and drilled through-holes for 
component leads.

I saw one of these things in operation and it made a dreadful racket and 
produced
low-resolution boards.

73--

Brad  AA1IP