A part manipulator an end effector coupled to a distal end of a robot arm. The end effector includes first and second clamp assemblies coupled to a frame. The first clamp assembly includes a first part gripper configured to pick a first part. The second clamp assembly includes a second part gripper configured to pick a second part. The second part gripper is movable relative to the frame in an actuation direction between a retracted position and an extended position. The second part gripper is located a second distance from the distal end of the robot arm in the retracted position. The second part gripper is located a third distance from the distal end of the robot arm in the extended position greater than the second distance.