A robot includes an articulated arm; and a base unit to which the articulated arm is operably coupled. The base unit includes: a rotating portion; an actuator mounted on the rotating portion and configured to rotate the rotating portion about a first axis; an arm connector attached to a first portion of the rotating portion. The articulated arm is connected to the arm connector to swing about a second axis; and a rib straddling the actuator and connecting the arm connector to a second portion of the rotating portion. The actuator is located between the first portion and the second portion of the rotating portion.