🚀 go-pugleaf

In article <78655@ut-emx.uucp> david@moe.ece.utexas.edu (david lee) writes:
>
>I admit that this is only a temporary solution, since not everyone has
>an HP 7470A plotter. The goal is to fill a drafting pen (which is intended
>for use with plotters) with a suitable resist ink. The following paragraph
>addresses the ink issue.
>

How about using the standard pen to draw on a photosensitive resist, which is
then developed and etched in the usual way ? It's more trouble than drawing
direct on the PCB, but it does avoid the problem of fitting an unsuitable pen
into a random plotter.

I'd like to go one further than David and avoid the need for chemicals 
altogether : machining the copper surface directly. The cutter would have
to be extremely small to do a useful job, but perhaps some sort of spark
erosion system might do it. 
Does anyone here have experience of spark erosion machines ? What sort of 
voltage and current is used, and how much material can reasonably be removed ?

-adrian

-- 
Adrian Godwin : agodwin@acorn.co.uk : adrian@fangorn.demon.co.uk : g7hwn@gb7khw
ObDisclaimer  : I believe this rubbish .. don't imagine that anyone else does.