On 11/07/10 18:51, Kenneth Scharf wrote:

The capacitor has a second gear driving a sliding rod, probably used to
move a dial pointer (see the two gears below the worm gear?). I suspect
the radio was tuned via a motor connected via a spline to the worm drive
and the moving rod was somehow connected to the dial pointer.

See the pic at http://www.fidnet.com/~seanbart/SCR-...-443-A_Top.jpg , I
think the rod is there to act as a stop, there is a pin on the sliding
piece that hits another pin at each end of the lead screw and inhibits
rotation.


Charlie.

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On 07/12/2010 04:59 PM, M0WYM wrote:
On 11/07/10 18:51, Kenneth Scharf wrote:

The capacitor has a second gear driving a sliding rod, probably used to
move a dial pointer (see the two gears below the worm gear?). I suspect
the radio was tuned via a motor connected via a spline to the worm drive
and the moving rod was somehow connected to the dial pointer.

See the pic at http://www.fidnet.com/~seanbart/SCR-...-443-A_Top.jpg , I
think the rod is there to act as a stop, there is a pin on the sliding
piece that hits another pin at each end of the lead screw and inhibits
rotation.


Charlie.

That would have been my second guess. The 5 tie plates holding the
rotor plates together binding against the stator plates would have
worked as a stop (that's how MOST caps work), but might not be a good
idea in a motor driven tuner.