[Boatanchors] Seized shaft

[Richard Knoppow]

----- Original Message ----- 
From: "Ian Wilson" <ianmwilson73 at gmail.com>
To: "Boatanchors" <boatanchors at mailman.qth.net>
Sent: Monday, March 31, 2014 4:05 PM
Subject: [Boatanchors] Seized shaft


> I've been working on an HP-606B for the past few days. The 
> bandchange
> mechanism was very stiff when I got the instrument, but 
> had become
> somewhat easier.
>
> However, today it has become very stiff. I broke the 
> (rather small) knob
> while attempting to operate the bandchange. Now the shaft 
> seems to have
> frozen in place: I can no longer turn it even with an 
> adjustable wrench.
>
> The tuning turret, etc, still moves OK. It appears to be 
> the short shaft
> that passes through a hole in the front panel that has 
> seized.
>
> It is not clear to me how this shaft is retained. The 
> 'inside' end
> passes into a housing about 1" deep and about 5/8" 
> diameter.
>
> Any help freeing this up would be most welcome. I just had 
> most of the
> rest of this great signal generator up and running 
> (typical!).
>
> 73, ian K3IMW

     I have a 606A manual, which came from an on-line source 
that has a drawing of the bandswitch detent mechanism and 
good mechanical assembly drawings in the back. I suggest 
soaking the shaft in a good bolt remover (forgotten a common 
term here). Not WD-40 but one of the good ones. The stuff 
made by Kano has a very good reptation. Someone on the list 
will remember the names.  Let it work for a few days if 
necessary.  Its likely the shaft is galled and stuck in the 
journal.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com