[Heathkit] [Heath] Lubing / Unsticking' the SB-401 LMO

[Chris Kepus]

Glen,

Any chance you saved some photos or narrative of your work in that area,
especially "soldering the end of the shaft".  If you don't already have it
written up, it sounds like all of would benefit from some pics and/or
specifics, like, what did you use to successfully clamp the two halves of
the "pinch" mechanism. and, which of your soldering weapons did you apply to
the shaft?  

Thanks,

Chris

W7JPG

 

From: Heath [mailto:heath-bounces at puck.nether.net] On Behalf Of Glen Zook
via Heath
Sent: Sunday, July 27, 2014 8:31 PM
To: RAY FRIESS; Robert Myers; heathkit at yahoogroups.com;
heathkit at mailman.qth.net; heath at puck.nether.net
Subject: Re: [Heath] [Heathkit] Lubing / Unsticking' the SB-401 LMO

 

As for adjusting the "pinch" drive, after one has done several, it does get
easier.  However, as for tightening the "pinch" mechanism itself, that is
definitely harder to accomplish.

 

I have found that soldering the end of the shaft, while clamping the two
halves of the "pinch" mechanism, usually gets it tightened up for a couple
more decades.  Of course, one has to confine the solder to just the
immediate area near the shaft.

 

Glen, K9STH

 

Website: http://k9sth.com

 

On Sunday, July 27, 2014 9:13 PM, RAY FRIESS <rayfrijr at msn.com> wrote:

 

My biggest gripe and grief with the SB line of dials is the dual copper disc
pressure system Heath engineers
dreamed up.  You can almost always count on some day the discs either
breaking from the shaft or loosening up
so the dial turning gets erratic or stops altogether.  The engineers had a
great dial mechanism on the single band
units.  I don't know why they couldnt have designed the SB units using the
same type of thing.
Disassembling and reassembling the drive units in the SB line has probably
driven many a ham to drink, trying to
get the dial in between those two discs and getting the correct upward and
downward pressure at the right location
and then tightening the nut without the shaft slipping out of place.  I have
uttered many a scream, added new flavor
to many age old cuss words and probably even invented a few new ones while
working on the SB drive mechanism.  HI HI


> From: rsmyers at rogers.com
> To: heathkit at yahoogroups.com; heathkit at mailman.qth.net;
heath at puck.nether.net
> Date: Sun, 27 Jul 2014 19:12:58 -0400
> CC: rsmyers at rogers.com
> Subject: [Heathkit] Lubing / Unsticking' the SB-401 LMO
> 
> Thanks to everyone for advice on 'unsticking' the SB-401 LMO that locks at
> 4-1/4 revolutions (as shown on the turns counter dial).
> 
> A couple follow up questions:  
> 
> 1. What grease cutters or cleaners do people recommend for removing the
> dried, or thick, original lubricant. 
> 
> 2.  What do people recommend for lubricating the system after step 1 (and
do
> you need to use conductive grease anywhere in there)?
> 
> Thanks,
> --- Rob Myers, VE3JQL
> 
> 
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