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The old Excellon PCB drilling machines work upside down, with an optical
arrangment and ground-glass screen above the PCB. One centres the pad on
the screen by moving the board, then a foot pedal is pressed and the
board is clamped and drilled, from beneath. Where a friend of mine works
they've still got one and use it a lot. I think it will also work from
paper tape.

Leon
--
Leon Heller, G1HSM
Email:
My low-cost Philips LPC210x ARM development system:
http://www.geocities.com/leon_heller/lpc2104.html