When machining a rack with a pitch tolerance of 0.01 mm on a milling machine or a similar workpiece, the tolerance of the lead screw is 0.025 mm, and the tolerance of the lead screw and other transmission parts exceeds the requirements of the workpiece. To this end, we designed a lateral feed indication device to control the lateral displacement of the bed head, with readings accurate to 0.01 and 0.001 mm. A dial gauge of 1% and 1‰ can be used as needed.