Homebrew PCBs

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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