If you’re considering purchasing a used unit of the Takisawa TS-4000YS CNC turning centre (twin/spindle + Y-axis + sub-spindle) manufactured in Japan, here is a detailed checklist and evaluation framework to help you assess condition, suitability and value.

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1. Key Technical Specifications (for reference)

Before inspecting the machine, it’s important you have a clear understanding of its intended capabilities.

• Model: TS-4000YS (YS = twin-spindle + Y‐axis version) from Takisawa.
• Maximum turning diameter: approx. φ370 mm with standard configuration.
• Maximum turning length: approx. 750 mm.
• Bar capacity: up to φ82 mm (depending on configuration).
• Spindle speeds: Left spindle ~4200 rpm; Right spindle ~6000 rpm.
• Motor power: Left spindle ~22 kW, Right ~11 kW (30 min/continuous rating).
• Floor space & machine weight: Approx 3000 × 2140 mm and ~6200 kg.
• Control: Often equipped with FANUC 32i-Model B (check actual unit).

Use these as baseline specs. If the machine you inspect deviates significantly, find out which options were fitted and why.

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2. Suitability / Fit for Your Production Needs

Assess whether this machine aligns with your production mix, lot sizes, materials, and process flow.

Ask yourself:

• Do the maximum diameter (φ370 mm) and length (~750 mm) meet your workpiece needs? If you need larger dimensions, this may constrain you.
• Does the bar capacity (~82 mm) suffice if you plan to run bar-feed operations?
• Do you require twin-spindle, Y-axis and sub-spindle capabilities? The TS-4000YS offers front- and rear-side machining (opposed twin spindle) which can reduce setups.
• What tools and live-tooling do you require (e.g., milling, drilling, live-tools on turret)? Check whether the machine has the appropriate turret, live-tooling spindles and Y-axis travel.
• What CNC control version and software does it use? Is it up to your standards or will you face obsolescence or additional cost for upgrades?
• What floor area, foundation, power, coolant, chip-conveyor and other utilities will you need? The machine’s footprint, weight and support systems must be addressed.

If this machine aligns well with your production, it may be a strong candidate; otherwise, consider alternative models.

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3. Pre-Purchase Inspection Checklist

When evaluating a used machine, you’ll want to perform a thorough inspection. Here’s a recommended checklist specifically for this model:

A. Mechanical & Structural Condition

• Bed and slideways: Check for wear, scoring or chatter marks on the X, Z and Y (if fitted) axes. Excessive wear may reduce accuracy.
• Spindles (both main and sub): Inspect for smoothness, noise, run-out of the chucks and bearings. Ask for vibration/temperature logs if available.
• Chucks and attachments: Hydraulic chucks (Kitagawa etc) must be inspected for leaks, grip wear, repeatability. The TS-4000YS is often configured with hydraulic chucks.
• Turret system: Check indexing, repeatability, turret backlash, tool-holder condition, live-tooling spindles (if present) and whether all stations function.
• Y-axis movement: On Y-axis versions, inspect Y-travel, accuracy, tooling holders for Y-axis operations.
• Sub-spindle: Check alignment to main spindle, transfer mechanism functioning correctly, bearings, speed and tool mounting.
• Bar‐feed interface and parts catcher (if present): For automated or bar operations, check that these are present and functional. The parts catcher is an optional accessory but common in this model.
• Chip conveyor, coolant system, lubrication/coolant tanks: Inspect for cleanliness, leaks, functional coolant pump, lubricant system, chip conveyor operation.
• Structural integrity: Look for signs of misuse, welding repairs, cracks, uneven leveling, or poor foundation which can affect accuracy.

B. Accuracy & Performance Tests

• Test cuts: If possible, run the machine with a known material and tooling to test actual surface finish, tolerances, concentricity, spindle run-out, tool change time, turret indexing.
• Thermal stability: Run the machine for at least 30-60 minutes and monitor any drift, changes in accuracy or temperatures of spindles/bed.
• Axis backlash and repeatability: Use indicators or dial gauges to check positional repeatability of X, Z and Y axes (if present).
• Spindle run-out: Use a test bar to measure run-out at the chuck nose and at tool tip—important for precision work.
• Alignment of main & sub spindle: Ensure that when parts are transferred between spindles the alignment is correct; misalignment leads to remachining or poor quality.
• Control performance: Check CNC control responsiveness, memory, look for broken keys, compare actual software version to your requirements; verify all functions such as live tool operation, Y-axis travel, etc.

C. History and Documentation

• Usage history: Ask for hours run, type of material processed, maintenance history, accident history, whether it has been moved and reinstalled (which might require re-alignment).
• Spare parts availability: Given the machine is a high-end Japanese turning centre, confirm spare parts availability for items like spindles, chucks, control electronics, turret.
• Service records: Check when last major services were carried out (bearings, spindles, linear guides), whether rebuilds have been made.
• Original manual and documentation: Operation manual, maintenance manual, parts list, installation drawings. Having these helps future upkeep.
• Installation and foundation details: Review whether original foundation requirements were met, whether machine has been relocated, whether proper leveling and grouting were done.

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4. Cost-of-Ownership & Value Considerations

When purchasing a used machine, the purchase price is just one component. Consider these additional cost factors:

• Installation & rigging cost: Machine weighs ~6200 kg and has significant footprint; moving and installing will require hoists/cranes, base leveling, foundation, alignment.
• Re-leveling and realignment: If machine has been moved, you must budget for realignment of spindles, turret, axes.
• Spare parts and consumables: Turret tools, live-tooling spindles, chucks, bearings—used machines may need replacement.
• Control upgrade or software support: Older control versions may require future upgrade or may have limited support.
• Training / operator familiarisation: Especially if this model has special features (Y-axis, twin spindle, sub spindle) you’ll want well trained operators.
• Future flexibility & resale value: Ensure that the machine remains relevant for your product mix, otherwise you risk limited resale market or obsolescence.

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5. Red Flags / Deal Breakers

When inspecting a used TS-4000YS, some red flags warrant caution:

• Excessive spindle run-out or noise—suggests worn bearings or worn chuck.
• Turret indexing errors or slow tool changes—may indicate excessive wear or missing function.
• Y-axis travel inoperable, or tools missing for Y-axis operations—reduces the advantage of this machine.
• Sub-spindle misalignment or parts transfer problems between spindles.
• No documentation, missing manuals or service history—makes maintenance difficult.
• Control unit with unsupported or obsolete software—could lead to downtime or inability to service.
• Structural damage, weld repairs, cracks or corrosion—compromise machine accuracy and longevity.
• Hidden costs not accounted for (foundation modifications, power upgrades, chip conveyor replacement).

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6. Questions to Ask the Seller

Here are suggested questions to ask when engaging with a seller:

1. What is the exact machine serial number and year of manufacture?
2. What is the total hours/cycles run (if tracked)?
3. What materials were processed (bar, billets, casting, etc.)?
4. Which turret version is fitted (10-station, 15-station, 20-station)? Any live-tooling stations?
5. What is the specification of the sub-spindle (speed, power, nose type)?
6. Has the machine been relocated or moved? If yes, when and by whom? Was alignment done afterwards?
7. What maintenance and servicing has been done; any major components replaced (spindles, bearings, guides)?
8. What control model is installed (e.g., FANUC 32i‐Model B) and what software version?
9. Are original manuals/documentation available?
10. Are there any options or accessories included (bar feeder interface, parts catcher, chip conveyor, work-holding packages)?
11. Are there any outstanding issues? Are all functions (Y-axis, twin spindle, live-tooling) confirmed operational?
12. What is the reason for sale?
13. Is a test cut/demo possible under load?
14. What are the shipping/installation requirements and costs if I buy?

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7. Summary & Recommendation

The Takisawa TS-4000YS is a high-performance, versatile turning centre with twin-spindles, Y-axis capability and sub-spindle, designed for complex and high-value parts production (such as aerospace, medical, construction-machinery components) per manufacturer description.

If your production requirements align with its capabilities (diameter/length, bar capacity, Y-axis & sub-spindle use) and you do a thorough inspection as above, a well-maintained example can be a very strong asset.

However, given the complexity and cost of such a machine (installation, maintenance, operator training, spare parts), it is crucial to validate condition, history and full functionality before purchase. Only proceed if you’re confident about its operational state and the machine will be fully integrated into your workflow.