Homebrew PCBs

Yup, I do Scratch and Etch. I've made boards that way. I use an HP plotter
(one of the larger ones). The trick is the 'paint' as you say - I use Dykem,
which is a machinists bluing agent. It's lacquer based, so dries quickly.
The tough nut is generating your artwork.

*Brian

-----Original Message-----
From: James Newton [mailto:jamesmichaelnewton@...]
Sent: Friday, November 12, 2004 6:19 PM
To: Homebrew_PCBs@yahoogroups.com
Subject: [Homebrew_PCBs] Scratch and Etch? has anyone?




Haveing just taken a shot at John for being condecending to a new 
idea, I should admit that I also think his Scratch and Etch idea is 
totally brilliant.

Has anyone ever just gone and tried this? I have done it with a 
simple plotter, a scribe in place of a pen, and a sheet of glass 
painted black. It works like a dream. My goal was to make a digital 
sun dial, not to etch PCBs, but I can't see why it wouldn't produce 
finer results than any other method.

The only trick is finding a paint that drys quickly to a hard (not 
brittle or tacky) finish so that it is completely and cleanly 
removed by the scribe. Also, the plotter may need to be a nice big 
one like my tough old HP (God rest its soul) because the scribe is 
going to drag more than a pen... probably.






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