Abstract : This paper proposes a synchronous control technology, applying two linear motors to a gantry-type high-speed boring and milling machine. The linear motors drive the gantry columns to achieve longitudinal feed, and the synchronous control technology keeps the two gantry columns synchronized. After proposing the design concept, this paper designs a stress compensation control method, provides specific implementation methods, and then conducts simulation studies. Keywords : Synchronous control; Linear motor; Gantry-type boring and milling machine 1 Introduction With the continuous increase in the single-machine power capacity of large-scale mechanical equipment in thermal power, hydropower, nuclear power, shipbuilding, mining, and steel rolling, the size and weight of the mechanical equipment matching these single-machine power are also constantly increasing, and the requirements for machining accuracy are also increasing. This has spurred the development of heavy and super-heavy machine tool manufacturing technology. As a large-scale machining equipment, the gantry-type heavy-duty CNC boring and milling machine, compared with the fixed gantry type, is not limited by the weight of the workpiece. When the workpiece length is the same, the total length of the machine bed is shorter, reducing the floor space. The moment of inertia of the moving body is also smaller, thus achieving high acceleration characteristics. For example, the gantry milling machine manufactured by Ingersoll in the United States, with a milling width of 7m, uses two columns driven by DC motors, with a synchronization error of 0.025-0.035mm. The high-speed gantry milling machine produced by FOR-EST-LINE in France has been successfully applied in automotive mold processing, improving machining accuracy and surface quality while shortening production cycles. This type of gantry milling machine requires two servo control systems to control the feed of the two gantry columns. To prevent gantry column offset or twisting, the two columns must remain synchronized, which places high demands on the control system. Therefore, how to eliminate mechanical coupling and ensure synchronization is a problem that has not yet been well solved for this type of machine tool. The traditional feed drive method uses a "rotary motor + ball screw" transmission device. This transmission method involves intermediate links such as couplings, ball screws, and nuts. Although it can guarantee a certain level of accuracy, it comes at the cost of speed. The Linear Power Servo Machine (LPMSM) is a thrust device that directly converts AC electrical energy into linear motion. Its basic structure and the structure and principle of the linear AC servo system are detailed in the literature. By directly driving the machine tool's worktable with a linear motor, all intermediate transmission links between the motor and the worktable can be eliminated. Similar to the electric spindle, the length of the transmission chain is shortened to zero, achieving "zero transmission" for the machine tool. This paper uses a linear motor in the synchronous transmission drive element to leverage its rapid dynamic response capability. Figure 1 shows a schematic diagram of the gantry-type boring and milling machine. [b][align=center]For more details, please click: Linear Synchronous Feed Transmission of CNC Gantry-Type High-Speed ​​Boring and Milling Machine[/align][/b]