Re: Partial Punch Problems, plus
By Karl Petersen
1. Andy LaTorre's point about cupping the roll punch is extremely
valuable. The cupping should be different for a roll punch since
only the first hole in an extended perf actually cuts on the front
and back at once. The cupping is not like a dish, but like a
cylinder placed crosswise to the direction of roll travel. For
punching rolls, leave a longer edge on the punch at the back (tab
end) than the front. The shortest edges are at the sides which cut
last. This way the tab end of the punch enters the die first, often
through a previous paper hole, thus it will be supported in the die
as the trailing edge cuts the paper. The punch will not be thrown
off center that way.
This subtlety was not necessary with the teletypes, of course, as
they only punched full round holes. The ejection works best, of
course, with full round holes being punched, and there are enough of
those in rolls to help clear the crescent-moon chaff created by the
extended holes.
2. Congratulations to Jody and family on their delightful addition. I
am waiting for list members to propose names....
[ There have been a couple of interesting suggestions sent to
[ the "rollreq" account. Ev and I have until Tuesday to make
[ up our minds...
3. I offer warmest encouragement to the Stoddard-Ampico/Chickering
rebuilder and wish he lived nearby so I could enjoy the exercise in
person.
Karl A. Petersen
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(Message sent Sat 26 Oct 1996, 03:57:18 GMT, from time zone GMT-0600.) |
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