[GreenKeys] grunting 28 KSR?

[Larry Goodrich]

Holy cow, if you have a motor that spazzes out, you need to get out of the
house and maybe the neighborhood.  Larry W9HTK


At 01:25 AM 6/3/06 +0000, Eugene Hertz wrote:
>Hello again,
>
>Yes I am knee-deep in learning about my 28 KSR and ASR and trying to fix
some anomolies.  I have two new questions.
>
>1. Grunting: Seems my KSR with the 3 speed gear shift very often goes into
a grunting mode, very often every other character. The grunting sounds like
a seal barking but with every rotation of the motor (or some shaft). I
thought it might be the gearshift because the grunting only takes place at
60wpm. Anything faster makes no sound.  
>
>I took the printer out and when I operate the main shaft from the motor,
all seems very smooth. However, the keyboard shaft seems to rotate freely
until a certain position, then it seems to rotate with quite a bit of
rubbing, perhaps a clutch of some kind? Performing the same experiment on
the ASR gives very simiar results, except that when the keyboard shaft goes
into "tough to turn mode" it seems to rotate more smoothly, the KSR has
more "grab" Could it be that at higher speeds the grabbing is less
vibrational? At 60wpm its slow enough to cause the grabbing to make an
audible vibration? Very audible, btw. My wife usually comes in asking which
of our children I'm choking! 
>
>So, as my first experiment, I thought I would lube the shaft. It seems the
shaft has a hole in it, and almost looks like some kind of wick or
something inside. So my question is, how does one lubricate this? Does one
apply oil in the hole in this shaft? Does one use grease somewhere?
>
>2. 28 ASR motor spazzes out.  It seems there are times that the motor in
the asr, instead of rotating in one directions, seems to vibrate or rock
back and forth. While this is occuring, the lights in my shack dim. If I
leave it in this state long enought, it will eventually catch and spin
properly.  At first I thought something was binding, so I removed the
printer and it still did this (not always, but several times a week).  I
rotated the motor by hand and there appeared to be no binding.  Eventually,
the motor kicked in, I check again bby hand (with power off) and the motor
seemed to turn as freely when its working as when its not. So I am
suspecting something wrong with the motor.  I was wondering, could there be
a starting capacitor involved here? Could that be failing?
>
>THANKS!
>Now back to my regularly scheduled teletype challenges!
>
>
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