The left-handed gong knife has the opposite direction of chip discharge compared to ordinary right-handed cutting tools. During cutting, chips are discharged downwards, and the cutting force presses down on the workpiece. It is a specialized tool for processing thin plates and precision appearance parts.

    Processing acrylic PC、 When using brittle and thin materials such as films and PCB fiberglass boards, a right-handed knife can easily lift the board upwards, causing the edges to turn white, the edges to break, and the copper foil to layer. A left-handed knife can cut downwards to lock the surface layer, and the incision is smooth and transparent, without the need for secondary polishing. It is suitable for mirror decorative parts and circuit board molding.

    When processing ultra-thin sheets, small text, and fine strip workpieces on a vacuum adsorption table, the material is continuously pressed down with left rotation to avoid the sheet being lifted and displaced by cutting force, greatly reducing the risk of small pieces flying off and being scrapped. All the dust generated by cutting PVC and fiberglass materials sinks, making it easy to collect dust and maintain a clean processing environment.

    Widely used in PCB board splitting, advertising thin plate carving, mobile phone light guide plate, film switch, and surface decoration panel processing, it can effectively prevent the surface of the veneer from warping and the deformation of thin-walled plastic. But its chip space faces downwards, making it easy to block chips during thick material processing. It is only suitable for fine processing of thin plates within 3mm, and for rough processing and cutting of thick solid wood, a right-handed gong knife is still used.