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
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--- 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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