Greater than 360 Servo (not continuous)
October 2, 2010
There was a question in the Shout Box earlier from noise0. He wants to turn a turret with srf08 sensor and be able to rotate at least 360 degrees. But it does not have to be continuous. He can go from 0 to 360 and then reverse direction back to 360.
There were a lot of ideas including a super modified servo (http://www.01mech.com/supermodified), stepper motor, or motor encoders.
I had a different, and I think simple solution. Just use a normal servo with 180 degree (or slightly less) freedom, and gear it up so the output of the turret gets greater than 360 degree freedom. Pick two gears with maybe a 3 to 1 ratio. The larger gear is attached where the servo horn usually goes. The smaller gear drives the turret.
Now you get decent positioning, more than 360 degrees of freedom and it is easy and cheap.