[GreenKeys] Spacing problem on a model 15

[Til128 at aol.com]

Hi gang:
 
I would like to add to this from experience:
 
Check the driven clutch (71214) screw (73798) is perhaps broken?, and if  
not check the spacing shaft (74164) to see if the hole for the screw is  
broken..lower part broken off.  Been there - done that.
 
TT
 
 
In a message dated 11/2/2016 11:39:25 A.M. Eastern Daylight Time,  
nagle at animats.com writes:


>  Date: Tue, 1 Nov 2016 10:58:11 -0700
> From: Audin Malmin  <amalmin at okb-1.org>
> Subject: [GreenKeys] Spacing problem on a  model 15
> A friend and I are restoring a 15-KSR.  We got it in a  partially
> disassembled state and have reassembled it enough to get it  running.
> ...
> But, there is still a spacing problem at two  portions of each line.  The
> carriage assembly slides very  smoothly, we have not been able to feel any
> drag at any point  (including those two areas).  The supporting rods and 
the
> rack  all look straight.  The gears that drive the spacing all seem to  be
> nice and round.  We've played around with different  return-spring 
tensions,
> up to the point where there isn't enough  tension to consistently trip the
> carriage release return, to no  avail.
>
> So, does anyone have any suggestions?

Sure. The first thing to check is the carriage return clutch, which  
is underneath the horizontal fiber gear which meshes with the  spacing
worm on the main shaft.  Check that it is engaging fully  and
that all those levers which drive it are moving smoothly.   See
Fig. 49 in the adjustments  manual.

http://www.aetherltd.com/public/model15manuals/138_Model15_Adj_Oct41.pdf

If  something is slipping, it's probably that. There are adjustment
procedures  for this in the manual.

The next thing that might be  slipping is the clutch on the main
shaft which drives the worm gear.   This you can check by watching.
Mark it in some way, and while typing  manually, make sure it
makes exactly one turn for each key  typed.

Less likely possibilities are loose meshing or  tooth damage on the
horizontal fiber gear.   In operation, for  each spacing character,
the worm on the main shaft makes one turn, which  advances the
fiber gear one tooth, which advances the carriage rack one  character 
position.  So the carriage is rigidly locked to the spacing  drive.
Unless gear teeth are not meshing or are damaged, that  drive
train can't slip.  But you've already checked for gear  damage.

A useful thing to do if you have a Model 15 with  a keyboard is
to provide loop power through the keyboard and printer  with
the motor off. You can then hand-crank the fan on the  motor
(counterclockwise), push a key, and run the machine through
its  cycle at slow speed.

John  Nagle


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