Application of cast iron platform: it is suitable for all kinds of inspection work and datum plane used for measurement; it is used for machine tool mechanical inspection and measurement datum; it is also an indispensable basic tool in mechanical manufacturing to check the dimensional accuracy or shape and position deviation of parts and make close lines.

　　Surface quality inspection of cast iron platform: the surface quality of grade 0, grade 1 flat plate shall not be less than 25 points within the scope of 25 mm square on each side, grade 2 shall not be less than 20 points, and grade 3 shall not be less than 12 points.

　　Specification of cast iron platform: 200 × 200-2000 × 4000 mm (special specifications shall be made according to the drawings of the demander or agreed by both parties).

　　Precision of cast iron platform: according to the national standard metrological verification regulation, it is 0, 1, 2, 3 levels.

　　Cast iron platform material: high strength cast iron ht200-300, working face hardness: hb170-240.

　　For the maintenance and repair of cast iron platform, in order to prevent harmful deformation of the plate, the support should be supported at the main fulcrum when installing the flat plate. When supporting, the working face of the flat plate should be adjusted to the horizontal plane as far as possible; after the inspection or marking, the workpiece should be lifted down and not placed on the flat plate for a long time; the working surface of the flat plate should be wiped in time, and then a layer of antirust oil should be coated, If it is not used for a long time, apply a layer of butter, and then lay a layer of white paper. A cover made of wood is used. When the plate is not used, cover the plate with a cover. It is strictly forbidden to drop water on the cast iron plate. The plate shall be subject to periodic verification, and the verification period shall be determined according to the specific conditions of use, generally one year.