spur gear inner gear slewing drive with the same direction design makes the mounting surface on the same side, which saves the equipment installation space. This type of slewing drive is used on special automation equipment to rotate the base of the robot arm. This slewing drive mainly bears axial load, tilting moment and torque, with high output torque. The processing method of grinding teeth enables the tooth meshing of the slewing drive to reach the accuracy of grade 6 and above, realising precise positioning and reducing the return clearance to meet the customer’s use.