if you do a search for risograph, you get to a copier like  mascine that 
is a stencil and uses exactly this method to produce the stencil.

vajk

Graham Stabler wrote:

>I bought a plasma globe from Maplin (like radio shack) yesterday for 
>almost nothing.  After playing for a while I removed the globe 
>leaving just the bare wire.  This was always my intention as I am 
>looking at making a small corona treater, anyway thats a different 
>story.
>
>Take an insulated screwdriver and hold it close the the end of the 
>wire and you get a spark between wire and screw driver.  Place a 
>piece of paper over the wire and tap with the screw driver and you 
>get a tiny hole in the paper, longer taps produce larger holes.  The 
>smallest just look like dots unless you hold it to the light.
>
>The idea is to place an plate on the milling bed (probably insulated 
>from the machine) and a pointed electrode in the chuck.  Position 
>some paper on top of the plate and the electrode just over the paper 
>and switch the discharge with the PC.  The result is CNC micro hole 
>drilling though paper. 
>
>Why?  I have no idea, perhaps pretty pictures, perhaps filters, 
>maybe higher voltage for leather marking.
>
>Graham
>
>p.s. High voltages are dangerous, don't play with them!
>
>
>
>
>
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