Here’s a detailed guide—tailored for buying a GOODWAY GLS-150 CNC lathe (Taiwan-made)—covering everything from inspection through installation. I’ll break it into phases: Pre-Purchase Inspection, After-Purchase Check & Preparation, and Installation & Commissioning. Since your portal (cncbul.com) deals in used machinery, you can use this as part of your “dealer checklist” for buyers as well.

1. Machine Overview – What you’re dealing with

The GLS-150 series from Goodway is a slant-bed turning centre with these typical specs:

• Max swing diameter ~ Ø500 mm; swing over saddle Ø310 mm.
• Max turning length ~ 500 mm.
• Spindle bore/bar capacity ~ 51 mm (bar) in one spec.
• Rapid traverses up to ~ 30 m/min on X/Z axes.
• Built for moderate-high precision, with linear guideways on X/Z axes.

Knowing the baseline spec means you can compare the used machine’s “what it should be” vs what you find it to be.

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2. Pre‐Purchase Inspection Checklist

Before committing, you’ll want to do a walk‐through and test run. Use this as your checklist, customised for the GLS-150.

A. Visual & Structural Condition

• Look for rust, corrosion, cracks or repairs on the machine bed, casting, and structural elements.
• Check chip guards, way covers and splashguards: Are they intact, and do they appear to have been well-maintained (e.g., minimal coolant/metal build-up). The GLS-150 spec mentions steel way covers and robust wipers.
• Examine the spindle nose, chuck mount area: Any damage, wear or scoring? On lathes, this area often indicates how much abuse the machine has had.
• Check the floor‐mounting/anchor system: Has the machine been moved often, or been well anchored? Misalignment and shifting may affect accuracy.

B. Spindle, Bearings & Drive

• Run the spindle at full rpm (and if possible under light load) and listen for abnormal noises: grinding, whining, knocking. Bearings are expensive to replace.
• Check for spindle run‐out: Insert a dial indicator in the bore or on the chuck and measure wobble. On GLS-150 the spindle bore/bar capacity is limited (~51 mm bar) so check that dimension.
• Inspect drive belts or belt drive system (if applicable) for wear. The GLS-150 has direct belt drive in some specs.
• Check when the spindle was last serviced: ask for bearing replacement history or logs.

C. Axes (X, Z, possibly Y/C axis)

• Check X and Z axis movement: smoothness, no binding, consistent acceleration and deceleration. On the GLS-150 the rapid traverse is up to 30 m/min.
• Inspect ball screws/linear guideways: any visible wear, backlash, missing lubrication, or pitting. Errors here lead to lost accuracy.
• Check home/limit sensor behaviour: Does the machine home consistently and hit soft/hard limits correctly?
• Ask for any available test parts: Are the tolerances still acceptable for your intended work?

D. Turret, Tooling, Live Tooling / C‐Axis (if fitted)

• Verify turret rotation: Does it index cleanly without hesitation? Are tool stations worn? On some GLS-150 versions turret size is 10 or 12 stations.
• If it has live tooling or a C-axis option (some GLS-150 models do) check that the drives, motor and wiring are intact and functional.
• Check tool-holder condition, adapter wear, mounting integrity.

E. Control Panel, Electronics, Software

• Identify what control the machine has (many GLS-150 are equipped with FANUC Oi-TC or similar).
• Ensure all displays, keypads, emergency stop, safety interlocks and interface ports are functional.
• Ask for power-on hours, cut-time hours (if logged): What’s the real usage? Hours ≠ hours machining but they help.
• Check wiring for wear, burnt marks, misplaced or non‐OEM modifications. Good inspection documents say wiring & connections are a key check.
• Ask about any previous control upgrades or retrofits: Sometimes used machines have outdated controls or parts harder to source.

F. Maintenance History & Service Records

• Request maintenance logs: lubrication schedule, bearing replacement, spindle rebuilds, ball screw replacements, crash history.
• Ask any known crash events: Has the machine ever been crashed, dropped, moved? Any repair scars?
• Ask about spares availability: For the model year, control year, motor serials.
• Check parts market: For a Taiwan-made Goodway GLS-150, parts availability in your country or EU may vary.

G. Machine Environment & Usage History

• Find out what the machine was used for: heavy roughing vs fine finishing will affect wear.
• Find out how well the machine environment was maintained: coolant quality, chip removal, cleanliness, floor vibrations, temperature stability.
• Ask whether it was operational up until recent: idle machines can have issues (lack of lubrication, rust, seals drying out).

H. Documentation and Manuals

• Ask for operation manual, service manual, parts list. For GLS-150 there is an operation manual available.
• Check if the original specification sheet matches what you see (e.g., tool stations, bar capacity, control etc).
• Make sure any accessories (chucks, steady rest, bar feeder, coolant system) are included or excluded clearly.

I. Transport / Export / Duty For your country

• Check machine weight (GLS-150 ~ ~3,200 kg for some specs).
• Verify dimensions: you’ll need to plan lifting, transport, crane access, floor loading.
• Check if machine has been disconnected properly, fluids drained, ready for transport.

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3. Post‐Purchase / Pre‐Installation Checks

Once bought and moved, before you start full production, go through these steps.

• Clean the machine thoroughly: remove old chips, coolant residue, rust spots.
• Re‐level the machine: Use precision spirit level or laser level to check the bed anchor bolts.
• Set up spindle taper & chuck correctly: Clean, mount proper tooling, check run-out again after move.
• Check all lubrication systems: Confirm auto-lubrication works (GLS-150 spec mentions auto lubrication).
• Check coolant system: pumps, filters, coolant quality, no blockages, no contamination.
• Check throttle and safety interlocks: doors, windows, guards.
• Run a test part(s): preferably your typical production part geometry, measure critical features, compare to what the machine claims.
• If the machine has live tooling or C/Y axis, test those functionalities under load.
• Monitor spindle and bearing temperature after a period of running: high temps mean potential trouble.
• Verify accuracy & repeatability: e.g., measure a part at extremes of travel to detect rapid drop-off. Use dial indicators or laser measurement if you have.
• Check vibration, noise, chatter under working speeds, ensure machine is stable on floor.

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4. Installation & Commissioning Tips

Since you’ll handle or advise installation, here are good practices.

• Ensure foundation and floor can handle ~3 to 4 tonne machine plus dynamic loads.
• Provide adequate utilities: power (3‐phase, voltage level, frequency), compressed air, coolant, chip removal, ventilation. The spec sheet mentions 20 kVA for some versions.
• Connect proper grounding and electrical protections.
• Install shielding and chip removal systems, as the slant‐bed design helps chip flow but you still need good housekeeping.
• Perform initial warm-up run: bit of cutting, tool change, axis movement, verify coolant, fluid levels, temperature rise.
• Define maintenance plan: e.g., daily visual, weekly checks, monthly intervals for gloves/ seals, yearly bearing inspection.
• Train operators: even though used, ensure their familiarity with control (FANUC/Oi-TC or other) and machine specifics.
• Start with controlled production: don’t push max loads until you have confidence in machine stability.
• Monitor first few production runs for signs of drift, accuracy loss, tool life issues.

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5. Specific “Red Flags” for the GLS-150 to Watch

Given the model’s characteristics, some issues are more likely:

• If the machine was used for heavy bar work (large volumes of swarf) and chip evacuation was poor → bed way wear or guideway damage.
• If live tooling/C-axis used heavily but not maintained: tool drive motors may be worn.
• If the machine had many year’s service in a hot/dusty environment but no regular lubrication → bearings and ways may be degraded.
• If control is very old and spare parts for FANUC or other may be expensive or harder to source in your country.
• If the machine has been re‐anchored / moved many times: leveling and bed alignment may be lost.
• If documentation / manuals are missing → future service can be harder.

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6. Decision Criteria for You / Your Platform

Since your portal deals with second-hand machinery in the international market, you might want to define some thresholds for acceptance:

• Maximum acceptable machine “power‐on hours” or “cutting hours” for GLS-150 before you discount price.
• Acceptable tolerance drop: e.g., machine should be capable of ± X µm on a 300 mm turning length—if more, negotiate.
• Availability of tooling (chucks, bar feeders) in Türkiye or nearby market.
• Transport & installation cost: moving from abroad (if export) plus possible refurbishment should be factored.
• After-sales / spares: does the seller guarantee a cooldown period? Will you offer a used-machine report to your buyer?
• Condition grade: e.g., “Good”, “Very Good”, “Refurbished”. Use your inspection checklist to classify.