How can I tell if the spindle of a used Yoga FTC450 CNC lathe has been repaired?
To determine whether the spindle of a used Youjia FTC450 CNC lathe has been repaired, you can start from the following aspects:
1. **Check maintenance records and files**
- **Machine tool files**: ask the seller if there is a maintenance record file for the machine tool. Formal use of the unit or maintenance organization will make detailed records of the content of each repair, time, replacement of parts and so on. If the file clearly records the spindle maintenance information, then you can directly determine that the spindle has been repaired.
- **Equipment resume**: Some companies will create a resume for the equipment, recording important events of the equipment, such as installation and commissioning, overhaul, remodeling, etc.. Check whether there is any relevant records about spindle maintenance in the resume.
2. **Inspection of spindle appearance**
- **Seals and Bonds**: Look carefully at the spindle seals, such as oil seals, seals, etc. to see if there are any signs that they have been replaced. Newly replaced seals usually have a newer appearance with no obvious signs of wear and aging. The bond with surrounding components may have some traces left over from the installation, such as sealant residue.
- **Surface paint and marking**: Check whether the paint on the spindle surface has traces of partial repair, whether the color is consistent with the whole, and whether there is any phenomenon such as flowing paint and peeling. In addition, check whether there are any signs of re-pasting or replacement of logos, nameplates, etc. on the spindle, as they may need to be replaced after maintenance.
- **Screws and connecting parts**: Check whether the screws on the spindle show signs of having been unscrewed, whether the slots in the head of the screws are worn or deformed, and whether the surrounding paint is scratched. Connection parts such as couplings, pulleys, etc. are connected to the spindle tightly, with no signs of loosening or reinstallation.
3. **Inspection of spindle performance**
- **Vibration and noise**: Start the spindle, let it run at different speeds, and judge whether there is abnormal vibration and noise by feeling and hearing. Repaired spindles with improper installation and debugging or faulty component quality may produce greater than normal vibration and noise during operation. A vibration tester can be used to accurately measure the vibration amplitude of the spindle and compare it with standard values.
- **Temperature changes**: After running for a period of time, use a temperature tester to measure the temperature of the spindle. If the heat dissipation system is not installed properly after spindle repair or the bearings and other components are poorly lubricated, the spindle temperature may be too high. Under normal circumstances, the spindle temperature should fluctuate within a certain range during stable operation.
- **Precision testing**: Use professional testing tools, such as a percent gauge, micrometer, etc., to test the radial runout and axial runout precision of the spindle. If the spindle has been repaired, its accuracy may be affected, and there may be a large deviation compared with the factory accuracy index of the machine tool. At the same time, you can also indirectly detect the accuracy of the spindle by machining test pieces to observe whether the quality of the machined surface and dimensional accuracy meet the requirements.
4. **Ask the relevant personnel**
- **ORIGINAL OPERATOR**: If possible, contact the person who has operated the machine and ask them about the use of the spindle and whether they have had any maintenance experience. They may have noticed some problems with the spindle in their daily operations and changes after repairs.
- **Maintenance personnel**: Check with the technicians responsible for the maintenance of the machine, they will be able to tell exactly whether the spindle has been repaired and what exactly was repaired and why. If you do not know the specific maintenance personnel, you can consult the local Youjia CNC lathe after-sales service center or professional maintenance institutions to see if they have the machine tool spindle maintenance records or related information.
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Used Automatic Lathe Machine for Sale WorldwideUsed automatic lathe machines provide a practical route to high-volume turning capacity without the lead time and capital cost of new equipment. For worldwide buyers, condition verification and supplier capability determine whether a low purchase price becomes a reliable production asset. Used Automatic Lathe Machine for Sale Worldwide What Buyers Should Assess A well-maintained cam-operated or CNC automatic lathe can retain stable repeatability for years when spindle bearings, guideways, collets, lubrication, and control components are within specification. Typical remaining service life is 5-12 years for a properly rebuilt machine, but heavily worn feed systems, obsolete controls, and unavailable parts create material selection risk. Machine type Typical work Used price range Main risk Cam automatic lathe Small pins, screws, fittings US$3,000-15,000 Cam and clutch wear Single-spindle CNC lathe Precision shafts, bushings US$8,000-35,000 Control and servo age Swiss-type CNC lathe Medical and electronics parts US$18,000-80,000 Guide bushing accuracy Inspection Before Shipment Checkpoint Acceptance focus Spindle Measure runout, noise, heat, and speed stability Axes and slides Check backlash, repeatability, way damage, and lubrication Tooling system Confirm collet, turret, feeder, and change-part availability Trial cutting Verify diameter, surface finish, cycle time, and scrap rate Electrical system Test alarms, drives, safety devices, and documentation Request a cold-start video, spindle runout report, sample-part test, machine serial number, and packing photographs. Accuracy claims should be supported by measured results, not appearance or repainting. China Supplier Value Established China-based suppliers combine broad used-machine sourcing with competitive refurbishment costs and export packing experience. Prefer suppliers able to provide inspection records, relevant quality certification, export documents, remote commissioning support, and stocked wear parts such as collets, belts, seals, sensors, relays, and hydraulic components. Cost item Direct as-is purchase Inspected Chinese supplier Initial price Lower Moderate Condition evidence Often limited Test data and video Export support Buyer-managed Crating and documentation After-sales response Uncertain Parts and technical support FAQ Can a used automatic lathe hold tight tolerances? Yes, after measured verification, alignment, and trial cutting; condition matters more than machine age. What accuracy should be checked? Check spindle runout, axis backlash, repeat positioning, workpiece diameter variation, and surface finish. Are old controls a concern? Yes. Confirm backup availability, drive condition, electrical drawings, and an upgrade path before purchase. Should buyers choose rebuilt equipment? Choose rebuilding when it includes documented replacement of wear components and a witnessed test, not cosmetic painting alone. Which spare parts should be ordered initially? Order consumable seals, belts, collets, sensors, contactors, filters, and model-specific tooling where available. Can a Chinese supplier arrange worldwide delivery? Experienced exporters can arrange seaworthy packing, shipping documents, and remote installation guidance. Choose a reliable Chinese supplier that can prove machine condition, support export delivery, and quote the right configuration for your current parts. Request a current quotation with inspection data before ordering.
