I am trying to make a robotic foot assembly, attaching my robotic foot to a motor which I have. I mated my motor to my robotic foot using concentric mates between the holes of the two parts. However, my robotic foot cannot turn at all, even when it is floated and the motor is fixed. The assembly says that the component is fully defined, even though it is not. On the other hand, the motor can always turn, regardless of whether I fixed it in place, or not. I cannot seem to understand why this is.