- According to the user’s requirements, after the threaded holes or grooves are set on the working surface of the plate, these parts should not appear raised above the working surface.
- The work surface should not have sand holes, pores, cracks, slag inclusions and shrinkage and other casting defects. All kinds of casting surfaces should be clear sand, and the surface smooth, solid paint. Each edge should be dulled. In the flat work surface where the accuracy level is lower than “00” grade, sand holes with a diameter of less than 15mm are allowed to be blocked with the same material, and the hardness thereof should be lower than that of the surrounding material.
- There should be no more than four plugging sites on the work surface, and the distance between them should not be less than 80mm.
- The scraping process shall be adopted for the working face. The planing process may also be adopted for the “3” level flat working face. The surface roughness of the planing work surface is not more than 5um according to the arithmetic average deviation of the profile. It should be subjected to the stability treatment. And demagnetization.
