Please Register and login to reply and use other advanced options
Posted by Bruce Richmond on April 18, 2009, 5:55 am
Possibly something with bi-metal bars, like in a themostat. With a
lens shining between two of them, as the sun moves the beam hits one
of the bars causing the rig to move, centering the beam again.
Actually only need one bar on the east/west axis since it should never
need to reverse direction. Just reset at the start of each day, or as
the bar cools it resets itself.
Posted by Jim Wilkins on April 18, 2009, 1:49 pm
If you allow electrical controls and a solar cell + battery powered
motor you could drive plastic 2:1 reduction gears from the hour hand
shaft of a cheap battery clock. The larger gear will move at the same
rate as the sun.
Size the solar cell to charge the battery, it doesn't have to run the
motor directly. Only track when the cell's output is above a threshold
so the battery doesn't run down during a week of rain. Some time at
night a cam switches on reverse power to reset the collector for dawn.
Limit switches stop the motor when the collector reaches the sunrise
and sunset positions for June 21.
The clock gear ratio is 4:1 for an array of moving mirrors and a fixed
Posted by sno on April 15, 2009, 12:57 pm
There are a bunch of freeware very good video editors/conversion
programs. If you post on alt.computer.freeware they will let you know
which are the best/most simple to use. Post separate messages for each
one and you will get the most responses. Put what you are looking for
in the subject. i.e simple video editor...??
hope helps...have fun....sno
Posted by Morris Dovey on April 15, 2009, 4:08 pm
It can't hurt to ask. :)
Thanks! I wasn't even aware of the newsgroup 'til you suggested it.
Having fun - /most/ of the time. :)
DeSoto, Iowa USA