[vcf-midatlantic] Workshop after-action report (IBM 029)

Douglas Crawford touchetek at gmail.com
Tue Mar 1 11:38:22 EST 2016


On Tue, Mar 1, 2016 at 8:41 AM, Matt Patoray via vcf-midatlantic <
vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:

> Nice work Mike! Another 029 lives!
>
> On Mon, Feb 29, 2016 at 7:23 PM, Mike Loewen via vcf-midatlantic <
> vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:
>
> >
> >    For the 2/27 - 2/28 workshop, I did some more work on the museum's IBM
> > model 29 keypunch.  When I first powered it up, it didn't do much of
> > anything except run the motor.  It gradually "warmed up" and started
> > punching, but was obviously in need of lubrication.  I cleaned and
> > lubricated many maintenance points, which quieted down the machine and
> made
> > its operation much smoother. I used Tech Rubber Roller Restorer to clean
> up
> > the rubber feed rollers.
> >
> >    I replaced my home-made arc suppression board with a spare from the
> > warehouse.  I also replaced the punch clutch pulley belt, which was ready
> > to fall apart, and substituted a much better looking program drum.  I
> > adjusted the two pressure rail microswitches in the card bed, and cleaned
> > and lubed the keyboard to fix some sticking keys.
> >
> >    During the process, the machine developed another fault: each time a
> > card would "register" at the punch station, it would automatically be
> > "released" and sent to the read station.  After several hours of
> > troubleshooting, I discovered a broken wire leading to the escapement
> > magnet assembly.  It had been hanging on by a thread, causing erratic
> > operation, and eventually completely broke away from the spade lug. I
> > soldered it back on, and the machine was again punching.
> >
> >    The very last thing I checked was the function of the sensing pins in
> > the read station, by trying to duplicate a card.  Not all card rows were
> > consistently read, but improved with repetition.  Unfortunately, I ran
> out
> > of time at that point.  I had lubed the sensing pins, but they need
> another
> > round of cleaning/lubrication.
> >
> >    At this point, the keypunch is useable for demonstrations in the
> > museum room.  The print mechanism still needs work, and doesn't print
> > all of the characters correctly.  Cleaning and aligning the print
> > unit will be a major project.
> >
> >    I multi-punched a VCF EAST 2016 card and left it on the punch.
> >
> >    Oh yeah: I also pushed an IBM printer for a 1/4 mile.  :-)
> >
> >
> > Mike Loewen                             mloewen at cpumagic.scol.pa.us
> > Old Technology                          http://q7.neurotica.com/Oldtech/
> >
>
>
>
> --
> Matt Patoray
> Owner, MSP Productions
> (330)718-3064 (mobile)
> mspproductions at gmail.com
> KD8AMG Amateur Radio Call Sign
>


Fabulous!- Great work and report!



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