1.What is a frame level and what are its main uses? A frame level is a square universal angle measuring instrument that uses the principles of liquid flow and a horizontal liquid surface. It directly displays slight inclination angles relative to the horizontal and vertical positions through a bubble level. It is mainly used to inspect the straightness of various machine tools and other equipment, the correctness of the installed horizontal and vertical positions, and can also detect tiny inclination angles. For example, during the installation of large mechanical equipment such as CNC lathes and machining centers, a frame level is required for precise leveling to ensure the stable operation of the machine and avoid machining errors caused by vibration. 2.What types of frame levels are there, and what are the differences between different types? Common levels include two types: frame levels and bar levels. A bar level is generally used to detect the levelness in a single direction; while a frame level can detect the levelness in two mutually perpendicular directions simultaneously, that is, perpendicularity and parallelism, and has a wider range of applications. For example, when detecting some equipment that requires multi-directional level calibration, the frame level has obvious advantages. 3.What are the specifications of the measurement accuracy of the frame level? Common measurement accuracies include 0.2/300, 0.5/200, etc. The number in front represents the height difference of inclination per unit length (such as 1m), and the number behind represents the measurement length. For example, 0.2/300 means that in a measurement length of 300mm, the accuracy can reach the detection of a height difference of inclination of 0.2mm. 4.What preparations need to be done before using the frame level? oCheck whether the appearance of the instrument is damaged, ensure that the inside of the bubble level is clean without impurities, and the scale is clear and visible. oWash the antirust oil on the working surface with non-corrosive gasoline, and wipe it clean with a degreased cotton yarn. oIf the ambient temperature during use is different from the storage ambient temperature, the level should be placed on a flat plate in the use environment for 2 hours before use. Because temperature changes can cause measurement errors, it should be isolated from heat sources and air sources. 5.How to use the frame level correctly for measurement? oMeasuring the horizontal plane: Place the frame level steadily on the measured object, ensure that the contact surface is clean and flat, and do not tilt or shake the level. At the same measurement position, the level should be turned to the opposite direction for measurement again. Move along the long side direction of the level and observe the offset of the bubble. If the bubble always deviates from the center, it indicates that the plane has an inclination phenomenon. Quantitatively describe the degree of inclination by reading the scale value. When reading, first determine the position of the bubble, and then calculate the specific deviation value according to the distance between the bubble and the center point. It is recommended to measure repeatedly several times and take the average value to improve the reliability of the data. oMeasuring the vertical plane: Hold the inner side of the auxiliary measuring surface by hand, and make the level stably and vertically (adjust the bubble to be in the middle position) stick to the vertical plane of the workpiece, and then read the number of grids that the bubble moves from the longitudinal level. Do not hold the part opposite to the auxiliary side surface and push it against the vertical plane of the workpiece with force, otherwise the measurement accuracy will be affected due to the deformation of the level caused by the force. 6.During use, what is the reason for the unstable reading of the bubble, and how to solve it? It may be caused by the change of the ambient temperature, which leads to the thermal expansion and contraction of the liquid, or there may be quality problems with the instrument itself. The solution is to try to use it in an environment with relatively stable temperature; regularly calibrate the zero point; for products with serious faults, send them for repair and replacement in a timely manner. 7.What is the reason for the large deviation of the measurement result, and how to solve it? It may be due to improper operation, such as not placing the level correctly, measuring in a vibrating environment, etc.; it may also be caused by the aging and wear of the equipment. The solution is to operate in strict accordance with the instructions for use; for old equipment, it is recommended to repair or replace it in a timely manner. 8.How should the frame level be maintained after use? After use, the working surface must be wiped clean, and anti-rust oil without water and acid should be applied. Cover it with moisture-proof paper, put it in a box, and store it in a clean and dry place. Avoid exposing it to a humid environment for a long time to prevent the metal parts from rusting. If it is not used for a long time, it is also recommended to take it out regularly for inspection, wiping, and applying anti-rust oil. 9.How to choose a suitable frame level? oConsider the accuracy requirements: Select according to the accuracy requirements of the actual measurement task. For example, high-precision machining requires a frame level with higher accuracy, such as the 0.02mm/m accuracy grade; for the installation and debugging of general ordinary equipment, the conventional accuracy can be selected. oPay attention to the brand and quality: Choose products from well-known brands with reliable quality. A level with good quality has high accuracy and stability of the bubble level, a sturdy and durable metal frame, and small measurement errors. oConsider the size specifications: Select a frame level of a suitable size according to the size of the measured object and the measurement range to ensure that it can cover the measurement area and is easy to operate.

Product Principles and Features Question: What do "three-dimensional" and "flexible" mean respectively in the three-dimensional cast iron flexible welding platform? Answer: "Three-dimensional" represents three directions. Generally, most fixtures are in the longitudinal and transverse directions. However, for this platform, in addition to the two directions on the large surface, the four sides can also be used for installation in the vertical direction, achieving a three-dimensional combination. "Flexible" means that due to the multiple combination and adjustment functions of the platform and its accessories, the whole set of equipment can change according to the changes of the products. One set of fixtures can meet the needs of multiple products, accelerating the product research and development and trial production process, and saving manpower, material resources, and financial resources. Question: What are the advantages of the three-dimensional cast iron flexible welding platform compared with traditional welding platforms? Answer: It has the advantages of being recyclable and enabling rapid positioning and clamping; it can extend and expand the working area in a three-dimensional space; the equipment has good flexibility and can be applied to any product by replacing the corresponding fixtures, and the equipment is not easily eliminated; it has high precision, which can improve product quality and production efficiency. Product Specifications and Parameters Question: What are the requirements for the material of the three-dimensional cast iron flexible welding platform? Answer: Generally, high-strength cast iron HT200-300 or HT300 is used, with a hardness of HB170-240, which has good stability, wear resistance, and corrosion resistance. Question: What are the specifications of the hole diameters and hole pitches of the platform? Answer: There are usually two series, D16 and D28. For the D16 series, the holes are Φ16, and the hole pitches are arranged in an array of 50mm±0.05; for the D28 series, the holes are Φ28, and the hole pitches are arranged in an array of 100mm±0.05. Usage and Maintenance Question: How to install the three-dimensional cast iron flexible welding platform? Answer: First, level it with a frame level, and then measure the flatness error with an optical synthetic level or an electronic synthetic level. If it is adjusted with a flat plate support, first hoist the platform smoothly onto the flat plate support. Adjust the adjusting feet under the support and the bolts supporting the flat plate on the support, and use an electronic level or a frame level for debugging to make the bubble in the center position, which indicates that the flat plate is level. Question: What are the precautions for using the three-dimensional cast iron flexible welding platform? Answer: Keep the platform clean frequently; place the workpieces gently to prevent the surface from being impacted; do not perform hammering work on the surface of the platform; wipe it clean in time after use. If it is not used for a long time, apply antirust oil or butter and cover it with white paper; avoid using and storing it in a humid, corrosive, or an environment with too high or too low temperature; try to use the platform evenly to avoid local wear and indentation. Purchase and After-sales Service Question: How to choose a three-dimensional cast iron flexible welding platform with high cost performance? Answer: It is necessary to consider the functional requirements and determine the specifications and functions according to the welding process and the size of the workpieces; pay attention to the quality and materials and choose brands or suppliers with high quality and good reputation; investigate the manufacturing process, as advanced processes can provide higher precision and a more robust structure; conduct price comparisons to ensure that the price is in line with the market value; consider the service and support, including pre-sales consultation, after-sales service, maintenance, etc. Question: How long is the general quality guarantee period for the three-dimensional cast iron flexible welding platform? Answer: The quality guarantee period is usually one year, but it excludes failures or damages caused by human factors or irresistible natural phenomena.

Regarding Material and Performance What are the common materials for marble platforms, and which one is better? Common materials include those from Northeast China, Hebei Province, Jinan Qing, and Zhangqiu Qing. Materials from Zhangqiu and Northeast China offer high cost-effectiveness and can meet the processing requirements of most applications. Jinan Qing or Indian stone materials have excellent performance but come with a higher cost. What are the advantages of marble platforms? They have uniform textures and a black luster, with a precise structure. They feature good stability, high strength, and high hardness, and can maintain high precision under heavy loads and at room temperature. They also have the characteristics of not rusting, being wear-resistant, resistant to acids and alkalis, non-magnetic, and not deforming. Regarding Precision Grades What are the precision grades of marble platforms? Generally, they are classified into Grade 1, Grade 0, Grade 00, and Grade 000. The lower the grade, the higher the precision. For example, the flatness tolerance of a Grade 00 marble platform within an area of 1 square meter can be as low as about 0.005mm. Is there a marble platform with a higher precision than Grade 000? In theory, it is possible, but it requires an extremely high-standard operating environment, and such platforms are relatively rare. In practical applications, Grade 000 precision can already meet the vast majority of high-precision measurement requirements. Regarding Use and Maintenance What should be done before using a marble platform? Ensure that the platform is leveled during the debugging process. Wipe the surface clean with a cotton cloth dipped in alcohol. Place the workpiece to be measured and the relevant measuring tools on the platform for 5-10 minutes. Wait until the temperature has adapted before conducting the measurement. What should be paid attention to during use? Place the workpiece slowly on the platform to avoid impact. The weight of the workpiece should not exceed the rated load. On the platform, light machining should be carried out, and do not move the blank. When using, do not knock or impact the platform, and do not place other items on it. How to maintain a marble platform? Regularly wipe it with a slightly damp cloth using a mild cleaner. Use as little water as possible, and then dry and polish it. Prevent hard objects from hitting or knocking it. For oil stains, you can wipe them with ethanol, acetone, etc., and then clean and dry it. Check and repair it regularly, at least once a year. Is a marble platform greatly affected by temperature? Temperature has a significant impact on its precision. For precise measurement of parts, it is best to conduct the measurement at 20°C. When measuring at room temperature, generally, the temperature of the workpiece and the platform should be made consistent. Avoid placing it near heat sources to prevent thermal deformation. Regarding Installation and Leveling How to install and level a marble platform? First, place the platform flat on the ground and adjust the stability of the four corners by feel, and fine-tune the movable feet. Then, place it on the support frame and adjust the position of the support points to be close to central symmetry. Initially adjust each support foot to make the support points evenly stressed. Use a spirit level or an electronic level gauge to detect and fine-tune it. After the initial adjustment is qualified, let it stand for 12 hours and then detect it again. It can be used only after it is qualified. What are the requirements for the support points during installation? Main support points and auxiliary support points should be set. The main support points are used for the main support during processing, verification, and use. The auxiliary support points are added to avoid load offset, etc. The supporting force of the auxiliary support points should be less than that of the main support points. Regarding Repair and Restoration What are the steps for repairing a marble platform? First, conduct rough grinding to make the thickness and flatness meet the rough grinding standard. Then, carry out semi-fine grinding to remove deep scratches. Next, perform fine grinding, followed by manual precision grinding to achieve the required precision. Finally, polish it to reduce the roughness. What should be done if the marble platform cracks? Epoxy resin adhesive for marble can be used for bonding and patching. First, clean up the debris in the crack. Stir the epoxy resin adhesive for marble evenly with marble particles or powder whose color and pattern are similar to those of the crack opening, and add a curing accelerator. Apply it to the crack opening. After it dries, use a corner surface polishing machine for grinding, polishing, and other operations. If the crack is large or the repair is difficult, it is recommended to consult a professional.

Material and Structure Question: What materials are generally used for cast iron platforms? Answer: Commonly used materials are high - strength cast iron such as HT200 - 300, and sometimes materials like QT400 - 600 are also used. Question: What are the structural forms of cast iron platforms? Answer: There are mainly two structural forms: rib - plate type and box - type. Specifications and Precision Question: What are the specifications of cast iron platforms? Answer: Common specifications range from 100×100mm to 4000×8000mm, and there are also other non - standard specifications that can be customized. Question: How are the accuracy levels of cast iron platforms classified? Answer: According to the national standard metrological verification regulations, they are divided into four levels: level 0, level 1, level 2, and level 3. Usage and Application Question: What are the uses of cast iron platforms? Answer: They are suitable for various product inspection tasks, as precision measurement reference planes, for checking the dimensional accuracy or geometric deviation of parts in machine tool and mechanical inspections, and can also be used for marking, assembly, welding, testing, and other work. Question: In which industries are cast iron platforms widely applied? Answer: They are widely used in many industries such as machinery manufacturing, automobile manufacturing, shipbuilding, electronic appliances, aerospace, scientific research, and education. Installation and Maintenance Question: How to install a cast iron platform? Answer: The installation ground should be flat and free from vibration sources. Select a location that is convenient for operation, has sufficient light, and is far from heat sources and vibration sources. Use a level gauge and other tools to level it to ensure that all parts are on the same horizontal plane. Question: How to maintain a cast iron platform in daily use? Answer: Regularly clean impurities such as oil stains and iron filings on the surface to keep it clean and smooth; for those without special anti - rust treatment, apply anti - rust oil regularly; avoid scratching the platform surface with sharp tools; regularly check the flatness, levelness, and load - bearing capacity. Selection Principles Question: How to choose the appropriate accuracy level of a cast iron platform? Answer: For high - precision requirements such as measurement and machine tool calibration, choose a level 0 or level 1 platform. For general machining, a level 2 or level 3 platform can be selected. Question: What factors should be considered when choosing the size and specification of a cast iron platform? Answer: It should be determined according to the size of the workpiece, the working space, and the convenience of operation. An overly large platform will occupy too much space, while an overly small one will affect work efficiency. Other Questions Question: What structures can be processed on the working surface of a cast iron platform? Answer: V - shaped, T - shaped, U - shaped grooves, dovetail grooves, round holes, long holes, etc. can be processed. Question: What is the general service life of a cast iron platform? Answer: Under proper use, it can last for 20 - 30 years or even longer. Platforms made of high - quality materials and with advanced processes can have a service life of more than 60 years. Can cast iron platforms be customized according to specific requirements? What is the surface treatment method of cast iron platforms? How to maintain and store cast iron platforms?