When evaluating a pre-owned / second-hand / surplus machine such as a Nakamura‑Tome WT-300 + GR-210 gantry loader (Japan-made), smart engineers will use a structured checklist to minimize risk and ensure you know what you’re buying. Below is a detailed guide of what to inspect, ask, and document — tailored to this twin spindle multitasking lathe + loader setup.

1. Machine identity & history

• Confirm the exact model: WT-300 (versus WT-250, WT-150 etc.). As pointed out by users, there are significant differences.
• Check the serial number, year of manufacture, machine hours or cycles.
• Ask for maintenance/service records: turrets, spindles, loaders, linear guides.
• Ask about original control type (e.g., Fanuc 18i-TB) and any upgrades.
• Ask if the machine has been relocated, how often, and if any major rebuilds were done (spindle bearings, turrets, loader mechanism).

2. Physical condition & alignment

• Inspect spindle nose(s) for wear, marks, chatter damage, collet condition.
• Check turrets (both upper and lower) for indexing accuracy, backlash, tool holder fit-up. As one user warned: “I used to run a 300, accurate and repeatable all day every day… but finicky had the turrets touch in slow motion and it knocked it out of spec.”
• Check ways, slides, linear rails (if applicable) for excessive wear, rust, damage.
• Inspect gantry loader (GR-210) for alignment, repeatability, servo/PLC logs. Ensure loader condition and reliability of pallet handling.
• Check lubrication systems, coolant systems, chip conveyors – often neglected on surplus machines.
• Ensure that all covers / guards were maintained, chips are not accumulating in hidden areas (one user noted chip accumulation behind turrets causing way wiper issues).

3. Functional test / controls & axis performance

• Power up the machine (if possible) and cycle all axes: X, Y, Z, A/B (if fitted) and ensure smooth travel, no unusual noises or stiction.
• Check spindle speeds and both main & sub-spindle operations. Confirm whether the max rpm / torque spec still meets your parts. For example, listings show spindle speed in older WT-300s at ~4 500 rpm and bar capacity ~65 mm in certain units.
• Test turret indexing: accuracy, repeatability, engagement firmness.
• Check live tooling / driven tools (if present) for speed, balance, tool holder integrity.
• Test gantry loader operations: pallet change, part transfers, sensor alignment. Verify the loader doesn’t introduce excessive vibration or misalignment.
• Watch the control interface: what control version (Fanuc, Siemens etc). Ensure parts-programming and cycles were properly used and that backup of programs exists.

4. Accuracy & repeatability

• Perform a test cut, measurement of a known sample part or reference block. Measure size, surface finish, repeatability of turret positioning, spindle run-out etc.
• Conduct spindle run-out check using a dial indicator (< 0.01 mm is desirable, but depends on job tolerance).
• Turret indexing check: tool-to-tool repeatability, tool holder repeatability.
• Gantry loader repeatability: ensure part placement doesn’t shift and that pallet exchange doesn’t introduce misalignment.

5. Consumables, tooling & spare parts status

• Check condition and availability of major wear items: spindle bearings, turret couplings, spindle drive belts (or direct drive), linear guide blocks, ball screws.
• Ask for the tooling set: are the collet chucks, tool holders, live tool modules original, or replacements?
• Confirm availability of spare parts for WT-300 and GR-210: although Nakamura-Tome machines have good reputation, older models may face parts issues. One forum user said “They are fantastic machines!”
• Verify whether the loader system is OEM or added later — check maintenance history for loader.

6. Utilities, environment & installation requirements

• Check electrical requirements: voltage, phase, power draw, whether any rewiring was done for export.
• Check foundation / anchoring: has the machine been relocated? Any damage to base or way alignment from transport?
• Check coolant system, chip removal, disposal for the particular job environment.
• Check safety features: guards, load/unload safety, gantry sensors.

7. Future maintenance & upgrade potential

• Ask whether major components (spindles, turrets, servos) have life left, or whether a rebuild might be required soon.
• Check firmware/controller version: ability to upgrade control (Fanuc/Siemens) for future compatibility.
• Assess machine’s current fit for your production: can it handle your parts dimensions, cycle times, tooling demands?
• Consider cost of integration: if the GR-210 gantry loader has to fit your fixtures and flow, you need to budget for integration, tooling, programming.

8. Documentation & warranty / seller credibility

• Get machine manual, maintenance/service logs, original build sheet if possible.
• Confirm seller’s credibility: is it a surplus asset from a reputable company? Reason for sale: relocation, job change, end-of-line?
• If possible, include a short acceptance test or performance guarantee if buying via dealer.
• Document any repairs needed or future planned maintenance costs.

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Risk Areas Specific to WT-300 + Gantry Loader Setup

• Twin spindle + twin turret configuration is complex: more moving parts means more potential for misalignment, wear, tooling setup challenge.
• Gantry loader adds automation complexity: if the loader is mis-programmed or mis-aligned, it can slow cycle times or cause scrap.
• Older machines may have slower spindle speeds/torques compared to newer models: ensure your cycle times and material types match what this machine can deliver.
• Check turret bottom unit: forum users mention issues with bottom turret in twin-turret machines.
• Parts & service: older controls or unique options may lead to harder to find spares later.

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Quick Pre-Purchase Scorecard

Check	Good = Green	Warning = Yellow	Red Flag
Hours / usage history	< 20K hrs, full log	20-40K hrs, partial log	> 40K hrs, no log
Spindle & turret wear	Minimal play, clean	Moderate wear/play	Excessive play, cracks, chatter
Turret indexing	±0.005 mm repeat	±0.02 mm repeat	> 0.05 mm error
Gantry loader operation	Smooth, fast, accurate	Some delays/mis-loads	Frequent failures/mis-loads
Spare parts availability	OEM parts available	Some parts require special order	Many parts obsolete
Control & software	Current Fanuc/Siemens version, good support	Older version, still supported	Rare control, unsupported
Tooling & consumables	Good set included	Basic set included	No tooling, unknown status
Installation/environment	Proper mounting, clean chips	Needs some clean-up	Poor foundation, heavy contamination

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Final Advice

• Don’t rush. Take time on-site.
• Bring a trusted technician familiar with multi-turret, twin spindle machines.
• Test parts: run a sample from your production portfolio if possible.
• Add margin in your budget for wear items, linear guide replacement, possible controls upgrades.
• Negotiate based on defects: If turret indexing is marginal or gantry loader needs service, factor that in.
• Plan installation & training: For a complex setup like WT-300 + GR-210, you’ll want time for setup, programming, loading/unloading integration.