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After much research, I have figured out everything I need except for the motors.
From what I've seen, most servos come with encoders, which I will probably find useful in a balancing robot, but the servos need to be modified for continuous rotation.
I'm assuming whatever I get I want it to be geared down maybe 30:1 or 60:1 so that I have ample torque but it can also drive fast enough so that if a big correction is needed, the robot can drive hard in the correction direction. Too high of a gearing and my top speed may not be enough to overcome a large tilt angle.
What gyro / accelerometer have you decided for? I'm just curious...
The Devantech RD01 propulsion kit is a complete kit for any robot and it will work with a balancing one. Actually, it uses EMG30 motors that someone from UK was using to build a balancing robot with Arduino and gyro + accelerometer. The motors are great, but they have a bit of backlash that you can hear clicking during balancing. Balancing robots need high precision gear reduction with no backlash. Perhaps a higher speed motor (less gearing) and a toothed belt reduction for the last stage will work best. Also, it is a good idea to get motors with built in encoders. I am having difficulties to build efficient encoders since I don't have a machine shop. Also it is a good idea to get a ready made motor controller/driver. I know it can be self made, but balancing robots need high quality parts. Anything can throw in a little error here and there so the robot doesn't stay balanced well.EMG30 specifications:gearbox 30:1Rated voltage 12v Rated torque 1.5kg/cm Rated speed 170rpm Rated current 530mA No load speed 216 No load current 150mA Stall Current 2.5A Rated output 4.22W Encoder counts per output shaft turn 360 The specs are for the output shaft (the motor plus gearing box).
Check out LynxMotion. I just bought a couple 30:1 DC gearmotors with encoders that fit to the gearmotors for about $40 each total.