? Engine dynamometer provide basic experimental platform. For a variety of testing, test work, precision measurement of the reference plane; for mechanical testing benchmarks; check the dimensional accuracy of parts or shape deviation, and as close crossed, can be made of cast iron floor vibration test stand, mechanical Manufacturing is also a lack of basic tools are not available. Usually made of box-type, square, circular, rectangular shape. Soldering iron plate specifically designed for large equipment base leveling, with reasonable design, stable structure, high precision, wear-resistant characteristics, can be realized 3000mm-6000mm flat stitching, the product is made by scraping or grinding. Widely used in machining, tool shop, machine (the seizure) repair workshop, large equipment base, measuring rooms and precision machining of the inspection, measurement and grinding, and can accurately measure, test workpiece flatness, straightness and angle tolerance value. Material: cast iron welding flat panel HT200-300 casting, when raw material content of the ingredients plus the ingredients according to the following criteria (%): carbon content: 3.1-3.4 Mn: 0.6-0.9, Si: 1.5-2.0, sulfur <0.12, P <0.3. Hardness: cast iron welding plate hardness: HB170-220, in line with national standards. After two manual processing (annealing 600 degrees -700 degrees artificial and natural aging 2--3 years) use of the product accuracy and stability, good wear resistance. Size: 100mm * 100mm-3000mm * 8000mm (special specifications according to the demand side, drawing production). The company's Web site www.thjmjt.com Precision: According to the national standard verification procedures, namely 00,0,1,2,3 five levels. Cast iron plate of the relevant parameters: size (length × width) mmprefix = o ns =? "Urn: schemas-microsoft-com: office: office" accuracy level height mm 0 1 2 3 flatness tolerance (μm) 100 × 100 4.6 9.0 18? 50 100 × 200 4.9 9.8 19.6? 50 200 × 200 5 10 20.5? 50 200 × 300 5.5 11 22? 50 300 × 300 5.5 11 22? 80 300 × 400 6 12 24? 85 400 × 400 6.5 12.5 25? 85 400 × 500 6.5 13 26 66 90 500 × 500 6.8 14 28 68 95 400 × 600 7 14 27.5 70 95 500 × 600 7 14.2 28.5 71 120 500 × 800 8 15.5 31 78 140 600 × 800 8 16 32 80 160 600 × 900 8.3 16.5 33 83 160 1000 × 750 9 18 36 90 180 1000 × 1000 10 20 40 97 180 1000 × 1200 10 20.5 41 103 180 1000 × 1500 11 22 45 112 190 1000 × 2000? 26 52 130 200 1500 × 2000 ? 28 56 140 230 1500 × 3000? 35 70 174 260 2000 × 3000? 37 74 184 260 2000 × 4000? 44 88 219 280 2500 × 6000? 60 120 300 300 3000 × 6000? 62 124 308 350??