[GreenKeys] ASR Motors, etc

[COURYHOUSE at aol.com]

where can I get gearshift for one of our ASRs???
 
ed# smecc
 
 
In a message dated 2/4/2013 9:22:30 P.M. US Mountain Standard Time,  
packard42 at gmail.com writes:

Ralph,

Not sure how bold type came through the Greenkeys  reflector.

The Bell System coding on the motors make it easy to  determine which  
you are looking at without
having to look up the  Teletype coding.  A 28A motor is for a 28 or 35  
KSR or  RO.  The 28C motor
is for a M28 or 35 ASR.  I have forgotten if  the 28A motor was also  
used in the Model 37.

As far as  dome-mounted reperforators are concerned.  Most are the   
standard typing reperforators
and many have gear shifts.  Only  specially made machines used the LARP  
multi-magnet  reperforators.

Gear shifts make changing speeds easy, but need routine  greasing...  
especially the steel versions.

Don  K9TTY


On 4 Feb 2013, at 1:41 AM, Ralph Irish wrote:

Dave  Burns & Group

The 28ASRs typically have a 1/12 HP, 3600 RPM  synchronous motor.   
28KSRs and free standing TDs
and other  items may have 1/20 HP, 3600 RPM motors.  Physically, they  
are  the same.  I was told
that the major difference is in the gauge of the  wire used in the  
windings and the UFD rating
of the Start  capacitor.  Amperage will also differ to produce the  
different  horsepowers.  Using
a common 'motor frame and case' cut down on parts  inventory and motors  
could be made to the
needs of the sales of  Model 28 equipment.

Essentially, the motors, 1/12 HP and 1/20 HP run at  the same speed.   
To get different operating
speeds,  different gear sets are used.

I have an ASR that has a 3 speed  gearshift that eliminates the need  
for gear changing  if/when
different operational speed is needed.  IN THIS CASE, I DON'T  KNOW  
WHAT GEAR SET IS USED.
The gearshift changes the speed of  everything:  TD, printer and reperf.

I know that George, W7TTY has  a lot of experience with Teletypes in a  
variety of  situations,
but I'm puzzled at the idea that the ASR in question will only  run at  
one speed, safely.  A
set of gears will affect the  running RPM of all components in the  
machine, with the  possible
exception of the 'dome mount' reperf.  I believe that it has  its own  
motor, but I am not
certain of this.  I have only  seen photos of these machines.

As for LARP and other types of reperfs,  I am not going to even offer a  
guess as to whether
the LARP is  the only one in use in 'dome mounts'.

The limited Delta Airline ASRs  from the mid to late 1960s had an 8  
level LARP as  THE  perf
mechanism, next to the printer.  Five of the levels were  standard  
Baudot/Murray coded, and
the other three were 'control'  functions for the pull-back TD and  
dialer mechanism.   These
machines did not need to make tape off the signal line.  All  tape  
preparation took place
from the operator typing on the  keyboard.

Ralph -  W8ROI


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