The feed and trimming of the M2110C Xinyuan internal grinder are performed by two non interfering transmission mechanisms, and the feed can be done manually or hydraulically. The $r $n machine tool is equipped with jump in and jump out mechanisms, so there is no need to manually adjust the tool after exiting the grinding wheel for measurement or trimming. The $r $n workbench is equipped with a hydraulic switch valve to ensure safety during loading, unloading, and measuring of workpieces. The $r $n machine tool is available for special orders and can be equipped with a high-speed grinding wheel shaft at 18000 revolutions per minute, suitable for grinding holes of 20-50mm.