17 Jan
2015
17 Jan
'15
1:05 a.m.
Couldn't you make the punch these days with a row of lasers? or maybe a single laser
that sweeps across the tape laterally?
Bonus because there wouldn't be any of that messy chad left. It'd just be up in
smoke, so to speak :-)
Chris
On January 16, 2015 2:09:32 PM CST, tony duell <ard at p850ug1.demon.co.uk> wrote:
--
Chris Elmquist
OBA! I'm crazy for creating a paper
reader/perfurator! :D This is
an old
dream of mine, although I have no specific
computers who use it, nor
any
specimen of perfored tape around. But I find it
to be just beautiful
:)
The reader is relatively easy to make at home, at least if you are
happy with a
photoelectric one. If you trigger off the feed holes, you don't need a
sprocket
drive, a capstan and pnch roller is fine. This is the sort of thing you
can make
in a good home workshop.
The punch is a lot harder. Making the punch pins and die block, and
then
correctly grinding and hardening the former is not going to be easy.
Mechanically the rest may not look too hard (the Facit 4070 used a set
of rotary solenoids and linkages, one per pin), but it is still a major
project.
-tony