[R-390] Geneva Mechanism question

[Barry]

I've started reassembling the geartrain (yes, I work slowly with limited
time).  Since I disassembled the Geneva mechanism, I started there.  When I
disassembled it, I didn't pay too much attention to how it worked.  When I
reassembled it, though, I was pleasantly surprised.  The Geneva mechanism of
the subassembly is common enough (although the intermittent action of having
different groups of triggering gears is a bit unique), but the other part is
quite amazing too.

The little ball bearing's action with the larger part of the Geneva
mechanism is quite unique.  The ball bearing along with the accompanying
slots and hole are a marvel to see in action.  It allows the main gear to
make nearly two complete revolutions before coming to a hard stop.  I don't
think I've ever seen anything quite like it.

Does this part of the mechanism have a name?  It is perhaps one the
cleverest part of the entire geartrain.  If you do decide to do a rebuild, I
would definitely recommend taking this thing apart just to see how it is
designed.  Mine had a bit of crud in the gears that needed to be cleaned out
(and besides, it allowed me to polish the brass outer gear) and it really
works smoothly now.

Regards,

Barry(III) - N4BUQ