[R-390] More geartrain rebuild info

[Barry]

Well, I suppose I'm outta luck on this one.  I've played musical gears with
them already so there's no way for me to tell which one's mate is which.  I
just hope any effect will be minimal.

Also, does the planetary gear revolve on KC changes or is it only on MC?  I
can't see the geartrain on my other radio to tell.

Barry(III) - N4BUQ


> Hi
>
> I very much agree that a gear train with a reasonable amount of crud in
> it probably will require the planetary gears be torn down. When you do
> the only way to really get them clean is to take them down to pieces
> and clean each one.
>
> The obvious gotcha is how do I get these back together with only two
> hands and a limited number of toes involved. Cleverly bent paper clips
> seem to be the "other" way to do this if you don't have access to stuff
> like plastic hemostats.
>
> Here's an issue that's a little more subtle. The gears probably left
> the factory all nice and uniform. When they did you could swap any
> "top" with any "bottom" and there would be no net effect at all. Over
> the years each "top" has rubbed against it's respective "bottom" for a
> really long time. Essentially you have created matched pairs of gear
> halves.
>
> So in addition to needing a number of fingers and toes to put it all
> back together you also need three sets of eyes to make sure all the
> sets remain with each other.
>
> The gear will work pretty darn well even if you randomize the gears. My
> story is that it was a controlled experiment and I'm sticking to it. If
> you want a silky smooth gear set when you are done it seems to be best
> to keep everything in order ....
>
>     Enjoy!
>
>         Bob Camp
>         KB8TQ
>
>
>
> On Feb 23, 2005, at 10:19 PM, Barry wrote:
>
> > List,
> >
> > In the process of tearing down this geartrain, I noticed the planetary
> > gears
> > were quite clogged with grease.  Scott's slide show says it probably
> > isn't
> > necessary to tear the planetary gears apart, but it didn't appear I
> > would
> > get this one clean unless I did and I'm sure glad I did.
> >
> > Upon taking apart the three split gears, all three exhibited a fair
> > amount
> > of drag when I twisted them against each other.  Upon closer
> > inspection, I
> > could see small burrs on the teeth.  After removing these burrs, the
> > gears
> > ride smoothly against each other.  I would never have known this
> > unless I
> > disassembled them.  Also, it gives me a good chance to ensure a lot of
> > the
> > hardened grease and dirt is removed.  After a 24-hour soaking in
> > kerosene,
> > there was still a significant amount of grime in this assembly.
> >
> > Now if I can figure out how to get four split gears all tensioned and
> > reassembled at the same time!
> >
> > Barry(III) - N4BUQ
> >
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>