Abstract
The present disclosure relates to a robot end effector for treating a surface of soft materials, and the end effector may include a coupler coupled to a tool flange of the robot; a motor coupled to the coupler to have a rotation axis orthogonal to a rotation axis of the tool flange; and a work tool connected to the motor to rotate according to the rotation of the motor, wherein the motor has a gear ratio lower than that of the motor provided in the robot.