Do you need some relatively powerful and very cheap servos for continuous rotation? Well, here I will tell you how to go about converting the Towerpro MG995 servo (rumoured to be 10kg/cm Torque) to continuous rotation.
Any constructive advice on the project or on the instructable would be appreciated - this is my first so be gentle :)
Step 1: Items required
I purchased 2 with metal gears here http://www.dealextreme.com/p/towerpro-mg995-metal-servo-with-gears-and-parts-10kg-torque-20089
2 each of 2.2 k Ohm resistors per servo motor. (Optionally a 5 k Ohm pot... or even the one in the servo. More about this later)
Then you need a soldering station and solder.
Helping hands help.
Small Phillips screwdriver.
Small awl (not pictured in tools photos)
Dremel and cutting disk
Goggles for safety of course.
Some means of testing and driving the servos. I used an arduino perfboard clone, a breadboard and some batteries.