Rough frame machine

The embodiment of the utility model discloses a rough frame machine. The rough frame machine comprises a base, a stand column, a cutter head planker and a milling power head, wherein the base is fixedly arranged on the ground through a foundation; the stand column is fixedly mounted on the base; the milling power head is fixedly mounted on the cutter head planker. The mounting surface of the stand column is provided with a guide rail surface; the guide rail surface is provided with step guide rails with height difference; a plane, which is opposite to the mounting surface of the stand column, in the cutter head planker is provided with a step which is embedded with each guide rail. The cutter head planker is connected with slide grooves in the step guide rails and slides on the step guide rails. The rough frame machine provided by the utility model adopts the step guide rails so that the stability of a machine tool in a machining process can be improved and the feeding amount is increased under the condition of not changing the specifications of milling cutters.