[Milsurplus] BC-348 Backlash Again

[John Hutchins]

Dave -
Now I my be doing it wrong:   I used wire jut big enough to fit in the 
gear teeth, to make a wire U shape keeper;  I push the gears past each 
other just enough for 1 or 2 teeth to cross over, just enough to load 
the spring, then slam the U shaped wire into the slot in the gear teeth 
to hold the tension, set the tuning capacitor in place, and tighten down 
the tuning cap., then pull the wire keeper.  Vo-La!
Hutch

On 8/22/2012 9:43 AM, David Stinson wrote:
> Working on getting a very nice BC-348 going for a friend.
> Backlash is a common problem with these sets.
> In this one, the backlash cause was between the gear
> on the end of the tuning capacitor and the pinion gear
> that drives it.  No amount of removing, cleaning,
> re-lubing and spring-retensioning corrected it.
> Couldn't see a non-destructive way to mesh the
> two gears tighter.
> The anti-backlish gear on the end of the tuning cap
> just does not have the "throw" needed
> to take-up the slop between it and the pinion.
>
> I cleaned-way all the oil and grease from the pinion.
> Cranked the tuning cap all the way closed.
> Then cut a strip of plastic electrical tape and fed it
> into the gear mesh point, cranking until I could grasp
> the end and bring it around, pressing the ends together,
> and then ran the gear back and forth to seat it.
> Used a soldering iron to remove the excess tape,
> leaving a little tab.
> This filled the slop and completely eliminated the backlash.
> Yes, the plastic tape will wear-out eventually.
> Does anyone know of a better and non-destructive
> product for taking the slop out of this mesh point without
> "poisoning" the lube in the tuning cap anti-backlash gear?
>
> 73 DE Dave AB5S
>
>
>
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