This model is a combination of a workbench and a mechanical polishing arm, suitable for surface polishing, slag removal, deburring and other treatments of small batches of metal sheets. The machine is very convenient to use, and only requires gentle manual pressure to achieve the desired grinding force. The self controlled vacuum adsorption workbench automatically distributes vacuum suction, and the workpiece is placed flat on the workbench without any clamping for grinding, which is efficient and safe. Different disc brushes can be selected according to the actual workpiece to achieve the desired effect. The machine comes with a built-in vacuum function, which automatically removes the debris generated during the grinding of workpieces, protecting the health of workers and keeping the workshop clean. One power with two grinding heads configuration, only need to rotate 180 ° to quickly switch grinding heads, efficient, convenient, safe and energy-saving.