Step 3: Geared clock drive details:
A standard off-the-shelf Intermatic Spring Wound Wall Timer (Model FD12HC), with a 21 tooth spur gear mounted on the 3/16" diameter knob shaft, and a 36 tooth spur gear mounted on the 1/4" threaded axis that holds and rotates the solar panel. The electrical contacts of the Intermatic timer were gutted to reduce drag.
It's important to note that these Intermatic™ clock timers are now in short supply, as the Intermatic™ website no longer seems to be running and hardware stores no longer stock these reliable and well-made devices. There are other brand(s) of household windup clock drive wall timers out there, but they are not well made and are unreliable, and are, simply, false economy.
It's important to note that these Intermatic™ clock timers are now in short supply, as the Intermatic™ website no longer seems to be running and hardware stores no longer stock these reliable and well-made devices. There are other brand(s) of household windup clock drive wall timers out there, but they are not well made and are unreliable, and are, simply, false economy.
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