Navistar sand cast iron pressure plate (pressure sand platform) is used to test a variety of precision parts of the plane, detection of the amount of repair blocks, work cards measuring tools, optical tools flatness benchmark instruments. 
 Navistar sand cast iron pressure plate (pressure sand platform) Material: high-phosphorus alloy, ductile pressure sand flat. By JB / T7974-99 standards for manufacturing, mining useful for face grinding process for grinding the workpiece, measuring the repair of this product after grinding of the workpiece surface roughness Ra ≤ 0.08μm. 
 Navistar sand cast iron pressure plate (pressure sand platform) test methods and procedures flatness: 
 1, according to the shape of the measured flat, sizes distribution in the form and determine the number of sections and each section of the concrete slab span. 
 2, the natural level or reflector on the measured cross-section of the concrete slab along the direction of measurement span, end span of convergence move, remember the location of readings. 
 3, when measured using the horizontal, measured surface generally transferred in a horizontal position; using autocollimator measurements, the measured line transferred to the optical axis roughly parallel with the instrument. 
 4, according to test results data processing section, find the value of flatness. 
 Navistar sand cast iron pressure plate (pressure sand platform) with 14 different specifications is divided into different 0, 1, 2, size: 100 * 100 200 * 100 200 * 200 300 * 200 300 * 300 400 * 300 400 * 400 450 * 400 500 * 300 500 * 400 600 * 400 600 * 450 600 * 500 600 * 300 
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