Hi Steve,
I am redoing one of my controller boards. It
will now drive 4 wire motors. I am drawing the isolation
paths in TurbCad. People ask me why I don't use Eagle
or one of the other programs. The reason is I can do
things with TurboCad those packages won't let me do!
Everybody has their favorite method. Scratch and
Etch is not for everybody. I just know that people who
use a plotter with a pen to layout their boards will
find the Scratch and Etch better. I found my pen
sometimes skips. Coating the board and Scratching off
the coating allows more control. More testing is needed
by people with open minds. They say if you build a better
mouse trap, people will beat a path to your door. The
truth is build a mouse trap that is as good and cheaper!
John
--- In Homebrew_PCBs@y..., Steve Greenfield <alienrelics@y...> wrote:
> --- crankorgan <john@k...> 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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