[GreenKeys] Model 14 tape printer repairs, parts, etc.

[Jack]

My advice....find a replacement motor...!

I am sure they are out there.

 

Jack K0TTY

 

 

 

 

From: greenkeys-bounces at mailman.qth.net
[mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of David Burns
Sent: Wednesday, July 25, 2012 7:38 PM
To: greenkeys at mailman.qth.net
Subject: [GreenKeys] Model 14 tape printer repairs, parts, etc.

 

With respect to the intermittently non-starting synchronous motor, I
was given (what I regard as) pretty good advice by my brother-in-law
should you decide to open the motor (which I've done, but after
receiving his advice!).

The clamshell ends of the motor are held in place by two long screws
that go all the way through the motor.  Naively one thinks "Well, I'll
just unbolt those screws and the ends will pop off".

Not so much.

Each end of the armature has the ball-bearing race press-fitted onto
the end of the armature shaft...no surprise, and unless something is
terribly wrong, prying the clamshell end off either end of the motor
leaves the ball bearing race in place -on the shaft-  (watch out for
the spring-loaded grease clamp that surrounds the outermost end of the
race).   In effect, one is prying the race out of a press-fit into the
clamshell.

This is what I did.  I had to pry it off with a screwdriver (after
removing the bolts).

My brother-in-law's advice: Mark each clamshell (against the main
motor housing) to indicate the exact rotational correspondence between
the clam shell and the motor!  A small scratch in the paint across the
divide between the clamshell and the main motor housing should do the
trick, before you unbolt the clamshells.

In this manner, when you finally come to struggle to put the thing
back together (without the factory jig that no doubt made such an
operation a snap), you can re-align each end, do the press fit to cram
the bearing race into each clamshell so that the screws pass through
the motor linearly without zigging or zagging.

I haven't finished...my motor is in pieces.  Good luck!

-Dave in Boston

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