Circular platform known as circular platform, round flat, round tablet, round table, suitable for a variety of inspection, precision measurement of the reference plane; circular platform ((round flat) testing benchmarks for machine tools ; dimensional accuracy or shape inspection of parts for deviation, and for close crossed, in the machinery manufacturing lack of basic tools is not circular platform size: 100 × 100-3000 × 6000 (special specifications according to the demand side, drawing production round. Platform (board) circular platform specifications Uses: Suitable for a variety of inspection, precision measurement of the reference plane; circular platform testing benchmarks for machine tools; dimensional accuracy or shape inspection of parts for deviation, and for close crossed circular platform in the machinery manufacturing is also indispensable basic tool circular platform ((circular plate) materials and handling: Materials for high-strength cast iron HT20-40, face hardness HB770-240 circular platform after two treatment (annealing 600 ° -700 ° artificial and natural aging 2-8 years), so that the accuracy of product stability, good wear resistance circular platform ((circular plate) Accuracy: according to the national standard verification procedures, circular platform are four levels of 0,1,2,3-level circular platform test: test blank circular platform primarily test whether the appearance specifications can meet the technical requirements, and there is no internal defects rough; circular platform. Machining tests mainly flat circular test holes have sand, porosity, cracks, sand, shrinkage and processing errors, etc.; product testing circular platform is mainly flat circular test flatness and appearance and specifications are possible to achieve the requirements.