[sdiy] Personal Pcb milling machines ???

[Gordonjcp]

On Thu, Dec 31, 2015 at 11:05:19AM -0800, charlie wallace wrote:
> works the same way as most cnc's, conductive pathway  it makes or
> breaks a circuit with the tip of the bit or some other way and you or
> the machine subtracts a known depth. or it pushes a spring loaded
> switch since some machines don't have a consistent electrical pathway
> through the spindle.
> 
> i use a piece of FR4 with a wire soldered on the copper, the machine
> moves slowly down til it makes contact to set the z height, then it
> subtracts the thickness of the board which gives me the Z.

Simple solutions are often the best!

Is there much of an advantage CNC milling PCBs compared to just etching them, for one-offs?

-- 
Gordonjcp