What to look for when buying a used Youjia FTC450 CNC lathe?
When buying a used Youjia FTC450 CNC lathe, you need to consider the overall condition of the machine tool, its performance, relevant information and accessories, etc. The following are the details:
1. **Overall condition of the machine tool**
- **Useful life and appearance**: Check the year of manufacture and use of the machine tool, in general, the use of a short life of the machine tool is relatively less wear and tear. At the same time, observe the appearance of the machine tool has no obvious bumps, scratches, paint and rust, etc., which may reflect the use of the machine environment and maintenance conditions.
- ** guideway wear **: guideway is the key component affecting the accuracy of the machine tool. Can be observed through the guide rail surface with or without wear marks, strains, scratches, etc. to determine the degree of wear. You can also use special measuring tools, such as a level meter, micrometer, etc., to detect the straightness and flatness of the guideway.
- **Screw precision check**: the precision of the screw directly affects the positioning accuracy of the machine tool and machining accuracy. Check the silk rod for wear, bending, ball breakage, etc.. You can manually operate the various axes of the machine tool to feel whether the operation of the silk rod is smooth, smooth, with or without jamming or abnormal resistance.
- ** spindle condition **: spindle is the core component of the machine tool. First check the spindle running sound is normal, there is no abnormal vibration or noise. Then rotate the spindle by hand, feel whether its rotation is flexible, there is no stagnation phenomenon. You can also use professional instruments to test the radial runout and axial runout of the spindle to assess the accuracy of the spindle.
2. **Machine tool performance**
- **Trial run test**: Conduct a trial run of the machine tool to observe whether the movement of each coordinate axis is smooth and accurate, and whether the rapid traverse and feed speed meet the requirements. Check whether the functions of starting, stopping and speed change of the spindle are normal, and whether the tool change action of the turret is accurate and smooth.
- **Precision test**: The machining precision of the machine can be checked by machining some simple specimens, such as cylindrical, plane and thread. Measure the dimensional accuracy, shape accuracy and surface roughness of the test piece, and compare it with the accuracy index of the machine tool to determine whether the machine tool can meet the processing requirements.
- **Electrical system check**: Check whether the electrical components in the electrical control cabinet are complete and intact, and whether there are signs of aging, damage or burning. Check whether the electrical connection lines are neat and firm, with no loose, broken or short-circuit phenomenon. Test the electrical functions of the machine, such as lighting, cooling, lubrication and other systems to see if they are working properly.
- **Hydraulic and lubrication system**: Check whether the oil level of the hydraulic system tank is normal, whether the oil quality is good, there is no leakage phenomenon. Start the hydraulic pump, observe whether the system pressure is stable, whether the action of each hydraulic component is sensitive and reliable. At the same time, check whether the lubrication system can supply oil normally, whether the lubrication of each lubrication point is good.
3. **Related information and annexes**
- **Technical information**: The seller is required to provide the original instruction manuals, electrical schematic diagrams, hydraulic schematic diagrams, operation manuals and other technical information of the machine tools. These data are very important for understanding the performance, parameters, operation methods and maintenance of the machine tool.
- **Accessories and tools**: Check whether the machine tool is equipped with complete accessories, such as chuck, tailstock, tool holder, tool setting instrument. Check the number, type and wear of tools and evaluate whether the tools can meet your machining needs.
- **Maintenance records**: Understand the maintenance history of the machine tool, including information such as previous failures, maintenance time, maintenance content and major parts replaced. Through the maintenance records can be a general understanding of the reliability of the machine tool and potential problems.
4. **Other matters**
- **Price evaluation**: Before buying, evaluate the price of used Youjia FTC450 CNC lathe. You can refer to the market price of the same type and age of the machine tool, combined with the actual condition of the machine tool, to determine a reasonable purchase price, to avoid too high or too low price transactions.
- **Transaction methods and contracts**: Choose the appropriate transaction methods, such as cash, bank transfer, etc., and sign a detailed purchase contract. The contract should specify the model of the machine tool, specifications, quantity, price, delivery time, quality assurance provisions and after-sales service to protect the rights and interests of both parties.
- **After-sales service**: Find out whether the seller provides after-sales service, such as installation and commissioning of machine tools, training, warranty and so on. If the seller does not provide after-sales service, consider whether you have the ability to carry out maintenance and repair of machine tools, or whether you can find a reliable third-party maintenance services.
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