Flat foot flat foot is a precise form of the gauge, flat feet coloring method used to indicate table method, test plates, rails and other long the plane, also used in the optical gap law of the workpiece edge straightness. 
 Flat feet generally with high-quality cast iron, rectangular, flat feet are also useful for bearings made of steel or granite. 
 Parallel to the flat foot: the standard by JB/T7977-99 manufacturing, material HT250, by scraping or precision face grinding, flat foot for machine tool inspection test roughness and non-straightness, the two face is in line with gauge block , micrometers, levels and other equipment inspection, different heights, the two parallel rails and not the level of rail connections, and can meet the rectangular device, testing can not only test the two-foot rectangular parts of the verticality of the gauge, also applies to equipment installation and inspection. 
 Flat foot: According to the industry is divided into different both heavy and light industries, heavy industry to use more special flat-foot cast iron, cast steel material, light industry to use more special flat feet Mg, alloy steel, stainless steel and other materials. Specific shape and models can be designed according to actual demand. 
 The use of magnesium aluminum flat foot: textile machinery installation, commissioning, maintenance, measurement. 
 Mg-Al-foot flat features: light weight, a 3-meter-long square feet is only 9kg. Easy to use, a 6-meter square foot, the staff can easily move the measurement. But not easy to deformation, the general point of steel is the material of the music service 30kg/mm2, general cast iron music service points 38kg/mm2, the material of the music service points to 110kg/mm2, bending far beyond the other material indicators. 
 Magnesium aluminum flat feet not rust: not coated with oil during the long-term is not used, stored lightly coated with a thin layer of oil to the general industry. Magnesium aluminum flat feet easy storage: hanging, flat can, and will not affect its long flat straight line, parallel. 

 Flat foot bridge: by JB/T7977-99 manufacturing standards, the material is HT200-300, the shape of arch bridge, there is only one face, flat foot bridge by scraping Face technology, is used to measure the straightness of the workpiece and flatness of the precision lapping tool, mainly used for grinding and measuring machine tool guide for grinding cast iron platform measuring use, the use of temperature (20 ± 5) ℃. 
 Flat foot granite Usage: mainly used for machine table, rails and precision face flatness, straightness measurement. 
 Flat-foot granite material: Jinan blue, black gloss, sophisticated structure, texture, uniformity, stability, strength, hardness. Is made of natural stone materials, precision reference measurement tools, instruments, precision tools, machinery and parts of the test, is an ideal base level, especially for high-precision measurements. 
 Granite square foot are based on the quality of the rock underground, after millions of years of natural aging, form extremely stable, do not worry about the normal temperature and deformation. Granite square feet subject to stringent physical tests and selection of granite materials, crystal fine, hard texture. Department of non-metallic materials as granite, no magnetic response, no plastic deformation. Its high hardness, so to maintain good accuracy. Even rock tools in use by heavy bump, up out of a few grains ballast only. Granite square feet of its superior quality iron and steel production base parts precision measurement, to obtain high and stable accuracy. 
 Granite square foot characteristics and advantages: 
 1, rocks through long-term natural aging, organizational structure is even a very small expansion coefficient, internal stress disappear, no distortion, so high accuracy. 
 2, rigid, high hardness, wear resistance. 
 3, are not afraid of acid and alkaline liquid material erosion, will not rust, do not coated with oil, easy to stick dust, maintenance, easy and convenient, long service life. 
 4, will not scratch, without a constant temperature to prevent, at room temperature can be maintained under the amount of accuracy. 
 5, no magnetization measurements can move smoothly, without Zhise sense, free from damp impact, the plane is good.