Negative chamfering refers to grinding a chamfer with specified angle and width on the insert edge. The negative chamfer increases the tool's wedge angle, enhances edge strength, expands the heat dissipation area, and increases chip deformation. It is significant for improving tool durability and facilitating smooth chip curling. Therefore, grinding a suitable negative chamfer is crucial for the insert. The DJ150 is a specialized machine for applying negative chamfers to inserts. It can grind negative chamfers according to the required angles for different inserts. Simultaneously, it allows for on-the-fly dressing of the grinding wheel to ensure the production of high-quality negative chamfers that meet insert specifications.