[Hallicrafters] Dial Stringing

[Roy Morgan]

On Dec 9, 2008, at 9:29 PM, WA1KBQ at aol.com wrote:

> I did an SX-88 tuning gearbox recently also.

AH, another member of the SX-88 gearbox club!

>  t... replace the ball bearings  many of which had developed
> flat spots.

That may have been from dried up grease and lots of use.

> Fairly tedious job timing all those  gears...  while attempting to  
> maintain the
> correct preload on all the spring loaded  split gears

For the preload I used lengths of telephone cable wire (common #22  
plastic coated solid) wound through the teeth after the right preload  
was set and clamped.  Then I assembled the gear into mesh with the  
other one and later clipped  out the wire.


> ... I found
> it was easier to install the springs  afterwards rather than attempt  
> to
> assemble spring loaded gears  .

A good trick.  I'll remember that for another job.  I wonder how they  
did it in production.

Roy

Roy Morgan
k1lky at earthlink.net
529 Cobb St.
Groton NY, 13073