I would like to have the assembly rotate about the axis as shown in the screenshot. What should I choose for the three blanks under Component/Direction?
The model should be first mated in such a way that this sketch entity (created inside one of the parts itself) is mated to an axis constructed at the assembly level. Once you have the model mated in the assembly so you can drag it in the rotation you wish to have then you apply the motor to it to cause it to turn. Without the mates to guide where it rotates though you don't really have control over its rotation.
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