[GreenKeys] grunting 28 KSR?

[Richard M. Gillingham]

The motor problem is probably a capacitor gone on the fritz.  It's in the 
enclosure underneath the motor.  I can't remember the value, but that's the 
symptom.

The 'grunting' does sound like a clutch not disengaging at 60 wpm, but with 
the higher rpm of the shaft, at higher speeds, it's enough to completely 
disengage the clutch.  Lubing may do the job.  There's not much you can't 
put oil on except the selector magnets and armature.  If oil gets between 
the armature and the magnets, it may cause them to stick together and that's 
a no-no..  It's also not too good for the platen, but you can easily wipe it 
off there.

Don't use WD 40.  It will wash away any oil in there.  A good medium weight 
machine oil will do.  About 20 weight, with no additives.

You'll hear from lotsa folks with more experience than I have.

Good luck
Gil, W1RG
----- Original Message ----- 
From: "Eugene Hertz" <ehertz at tcaf.org>
To: <greenkeys at mailman.qth.net>
Sent: Friday, June 02, 2006 9:25 PM
Subject: [GreenKeys] grunting 28 KSR?


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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