Create four keys with the same distance between them, using these values:
Key1: Rotation = 0
Key2: Rotation = 120
Key3: Rotation = 240 (Note that this value might display as -120)
Key4: Rotation = 0
Make sure the key type is set to linear. The distance between the keys controls how fast the wheel spins. The closer the keys are to each other, the faster the wheel turns.
I've created an example project for you with multiple animations.
rotation-example.spine
