Homebrew PCBs

--- crankorgan <john@...> wrote:
> Hi KPL,
>        You are using the wrong coating if it cracks. See
> Denny's post! I mill circuit boards all the time. The
> idea of Scratch and Etch came to me the other day. Mechanical 
> Etching bits have a limited life. Using the Scratch and 
> Etch method should be faster and cheaper for the home hobbiest.

Yeah! And very little to modify a plotter. Just take an empty pen
and drill out the center to fit a carbide tipped pen. Maybe cut off
most of the carbide pen to reduce the mass and so it fits within
the body of the pen.

I like the idea of just running it twice to widen the tracks and
ensure no bridges.

I have a couple of HP plotters here. Both unfortunately need some
work, one shuts down after about 10 seconds of plotting, the other
seems to slip, making angles into wierd curvy things. But good
enough to test the idea on.

Steve Greenfield


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