Double column Planer Milling Machine has portal frame and horizontal long bed. Planer milling machine is mainly used for planing large workpieces. Workpiece is through the gantry framework to do linear reciprocating movement. Beam is generally equipped with two vertical tool rest.Tool slide can adjust rotation angle in the vertical plane and do transverse feed movement along the beam. The beam can be adjusted up and down on the two columns. generally side tool posts are also installed along the column to expand the processing scope of workbench. Machine table is driven by generator, can be adjusted by DC silicon-controlled.Thus it will have a larger speed range and also get larger driving force when at low speed. Many of planer milling machine is also attached to the milling head and grinding head, workbench can do rapid movement and slow feed movement. This type planer milling machine is mainly used for heavy-duty workpiece during an installation of planing, milling and grinding surface processing.