Re: Partial Punch Material Problems
By Karl Ellison
Andy LaTorre wrote of the difficulties of partial-punched materials and the problems they cause.
Having a hand in manufacturing for the last 6 years, I have had a chance to closely inspect punches that are used to make Numerical Control (NC) machine data paper strips used to write out NC machine programs, then to read them in at the machine. They still use these paper tapes today because you can expose them to big magnetic fields found in machine shops, heat, splash oil on them, and they're still good to read .. unlike floppy disks.
Anyway, I looked closely at the punch. The punch itself was cup-shaped, kind of like a melon scooper, but not quite. I was told it was shaped this way such that when the paper or mylar tape was perforated, the punch's shape caused the punching to bow a bit, and just as the last bit of material is cut through the scrap dot of paper is bent into a little cupped spring so that when cut completely though, it throws itself away from the punch when it reshapes itself into a flat disk again - like the way you bend a deck of cards moments before you play "52 pick-up" ;).
- K a r l B. E l l i s o n
Ashland, Massachusetts, U.S.A.
KBEllison@aol.com
http://members.aol.com/kbellison/kbe.html
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(Message sent Thu 24 Oct 1996, 14:44:33 GMT, from time zone GMT-0400.) |
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