Denny,
Great job! When the idea hit me I was working on a 4 axis
4 wire controller board. I try to be innovative. Like I said in
my first message. I am here to help out! I goofed by sending
people to a picture of an etched board I did. The problem was
I used the location of a page on my website instead of the
picture. I only wanted people to know I really mill circuit
boards for a living using a Dremel. I also use cheap 1/4-20 threaded
rod for all my machines. In the right hands Scratch and Etch will
be lots of fun! A cheap plotter and some isolation software.
Good work Denny!
John
--- In Homebrew_PCBs@y..., milwiron@t... wrote:
Hello Steve, John and All,
I had to run a sample of a redesigned board Saturday morning so I
tried a
simple Scratch and Etch test of John's idea.
Here are some fast notes:
I coated a small piece of 1 oz. single sided board stock with Dykem
metal
layout fluid. (I did clean the board first with 320 wet or dry and
a quick
wipe with lacquer thinner. Scribing lines through layout fluid
coating
produces very clean marks with no chipping
A metal-scriber's weight alone is not quite enough to get a line
down to
the copper, a little extra weight was needed. A light spring
loading on the
plotter would probably be fine.
I also scribed some thicker lines with a 1/16" inch wide tool I had
laying
on my bench.
The board was etched in Sodium Persulfate at 120 degrees F.
The Dykem layout fluid had no problem as a resist, in fact I'll
probably
fill a pen and start using it to repair bad resist areas on proto
boards.
Bottom line: The resulting etched scribe lines came out beautifully
and the
Dykem cleans off easily with Scotch Brite or some light wet or dry
sanding.
My only minor concern is the narrowness of the isolations produced
by a
pointed scriber and soldering using a set of eyes that ain't what
they were
10 years ago.
Denny
Very interesting idea.
You could use layout fluid for metal working. Most are a lacquer
type base
and scratch very cleanly since that's exactly what they're
designed for.
Dykem is one manufacturer, it's available in a couple of colors,
spray or
brush.
Denny
Great idea. Anyone here have some and some etchant and want to try
it and report back here? Nothing fancy, just coat a scrap of board
and then scratch the surface with the scratching device held at 90
degrees with only its own weight holding it down.
Steve Greenfield
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