Abstract: The noncoupling problem of synchronous drive for gantry-moving milling machines is studied. Two linear motors are used as the transmission mechanism for the gantry column's longitudinal feed. The coupling between the feed and output is analyzed, and a decoupling controller is designed to compensate for the stress changes caused by the non-parallelism of the gantry frame. Simulation results show that the system has good performance and can quickly achieve synchronous operation. Keywords: Synchronous drive; Decoupling compensation control; Linear motor; Gantry -moving milling machine Two linear motors are applied as a traversing drive mechanism for gantries. The coupling between the ducts and outputs is analyzed. A decoupling controller is designed. Tension compensation is used for realizing synchronous drive. Simulation results show system performance. Key words: synchronous drive; decoupling compensation control; linear motors; gantry-moving milling machine 1 Introduction With the development of high-speed, high-precision boring and milling technology, large integral parts and geometrically complex surfaces are often required for machining. Due to the large weight of the moving parts of the machine tool, it is difficult to obtain high acceleration; at the same time, due to the limitations of the worktable length and the requirements of the workplace, high-speed machining of large and complex surfaces is far from meeting the requirements. For high-speed gantry-moving boring and milling machines, because large moving parts do not always form a symmetrical structure and symmetrical force, and due to various uncertain disturbances during operation, even if the two sides of the gantry use the same transmission mechanism, the consistency of the gantry frame movement cannot be guaranteed. The mechanical coupling caused by this inconsistency may damage the gantry frame or drive components. Therefore, how to eliminate the mechanical coupling caused by gantry column offset or torsion, ensure machining accuracy, and avoid mechanical damage is a significant problem that has not yet been well solved for this type of machine tool. This paper uses a linear motor in the drive element of the synchronous transmission to leverage its high-speed dynamic response capability and achieve rapid synchronization. The structural principle of the dual-motor synchronous transmission system is shown in Figure 1. [b][align=center]For more details, please click: Application Research of Synchronous Transmission Technology Based on Decoupling Control[/align][/b]