PCB Mill (Was Re: small stuff (list goals/aims/results?))

--- In CAD_CAM_EDM_DRO@y..., "Kerry" <kez@w...> wrote:

> Since joining this group I have built a wooden CNC engraving machine
> from old printers (motors guides and transistors for the drives),
> three pic chips, draw slides, dermal, threaded rod, and mdf. I use

it

> to make circuit boards for electronic projects. It cost £106 to

build

> including the dermal and the home made stepper controllers.

That sounds like the machine I've been planning to build! I've been
wanting a PCB mill, so I've accumulated a bunch of stuff to base it
on:
MDF, threaded rod, ball-bearing drawer slides, dremel tool, stepper
motors from some old electronic gizmos (scanner, plotter, laser
printer), etc.

My questions are:

1) What is this 'dermal' you mention?
2) How good is the repeatability of your machine? (One of the reasons
I've not gotten very far on the machine is that I worry that the
resulting machine might not be accurate enough for making simple
printed circuit boards.

Thanks!

--marco