[R-390] RF subchassis separation

[Roger Ruszkowski]

Mark,

Happy you have saved another great receiver.

Ah, the things we have to do to keep our toys in good repair.
After this level of work on just that shaft, I hope the rest of the receiver goes better.

May the gear train clean up and run smooth for the next 50 years or so.


Roger AI4NI


-----Original Message-----
From: Mark Richards <mark.richards at massmicro.com>
To: r-390 <r-390 at mailman.qth.net>
Sent: Tue, Mar 4, 2014 2:21 pm
Subject: Re: [R-390] RF subchassis separation


Possible solution found - and without panel separation.

     1. Drilled a small hole adjacent to the base of the shaft and at an 
approx. 45 degree angle.
     2. Inserted steel pin material through the hole and (hopefully) 
into the screw head.
     3. Hold the pin steady, rotate the shaft carefully, and hope that 
nothing slips.
     4. When tight, cut off excess pin material.

Photos here:

http://kumichan.net/private/03-04-2014-10-22-24.png

http://kumichan.net/private/03-04-2014-10-22-43.png

It seemed to me that the screw was binding and I was of course terribly 
concerned that, already weakening its soft metal with a hole, it would 
simply snap off.  But the screw appeared to stay put while the shaft 
turned (I treated with some penetrating oil first).. either that or the 
pin material and slight rotation of the shaft bound up behind the panel 
in sufficient quantity to pull the pin tighter to the aluminum plate.

Whatever.

The result is not pretty, and certainly not stock, but the post appears 
to be steady (gear assembly will test this).

/K1MGY

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