Here’s a guide for what to check if you’re buying a used Daewoo (Doosan) Puma 230MS lathe / turning-milling machine. Use this as a checklist during inspection or negotiation.

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Basic Specs to Know

Knowing the machine’s specs helps you assess whether it meets your needs, and gives you clues about wear / value. Some typical specs of the Puma 230MS:

• Fanuc 18T / 18iTB control in many units.
• Max spindle speed ~ 4,500 rpm on the main spindle.
• Sub-spindle often included with various speeds (sometimes 6,000 rpm) and a live tooling station.
• Bar capacity ~ 65 mm.
• Turning diameter over bed ~ 290 mm. Swing over saddle somewhat less.
• Travel in Z ~ 580 mm in many units; X travel depends on configuration.
• 12-station (or more) turret, often with driven/live tooling and C-axis indexing.

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What to Inspect & What to Ask

Here are detailed areas to check, and questions to ask, so you can discover hidden problems and judge whether the machine will perform well.

Area	What to Inspect / Test	Key Questions to Ask
Spindle(s)	• Run at various speeds and listen for unusual noise or vibration. • Check run-out (axial and radial) and test for heat build-up. • Inspect spindle taper and bore for wear or damage. • For sub-spindle: check condition, alignment, whether it engages properly.	“Have there been spindle rebuilds? When was the last bearing replacement? Any spindle run-out / vibration issues?”
Control & Electronics	• Check controller model / version; make sure it is reliable and serviceable. • Run each axis; check servo responsiveness, backlash, encoder feedback. • Inspect limit switches, sensors, wiring, any intermittent faults or alarms. • Confirm all needed CNC functions (live tooling, C-axis, sub-spindle) are working.	“What control version is it? Any unrepaired electronic faults? Are drives / amplifiers / encoders in good shape?”
Turret & Tooling / Live Tooling	• Does turret index cleanly & accurately? Any wobble or play? • Check wear in tool holders, seating surfaces. • If live tooling: check driven tools’ speed, torque, vibration, coolant delivery. • Check tool changing mechanism, tool magazine (if present).	“How often has the turret been serviced? Are all live-tooling stations functional? Any missing or worn holders or tools?”
Axes & Structural Condition	• Move axes throughout full travel; see smoothness, consistency, look for binding, loose parts. • Inspect guide ways/slides for wear, scratches, pitting, corrosion. • Check frame integrity, sub-spindle mounting alignment. • Check whether machine has been reloaded / dropped / damaged.	“Has the machine ever been dropped or had any crashes? When were the axes aligned / adjusted / scraped / bed ways refurbished if ever?”
Accuracy & Calibration	• Request test parts or calibration data: dimensions turning, milling, concentricity, roundness. • Check repeatability over multiple cycles. • Run a part that uses full Z travel, full X travel, full turret usage.	“Do you have recent calibration / inspection reports? What tolerances has it historically held under production?”
Wear & Usage History	• Hours of operation: total and hours on spindle/live tooling etc. • What material types were machined (hard, abrasive, tough steels increase wear). • Maintenance records: lubrication, coolant changes, alignment checks. • How was it used — heavy cutting, light finishing?	“What are the total running hours? How heavily was it used? How often maintained?”
Drive / Feed / Interpolation Features	• C-axis indexing: does locking function work cleanly? • Any issues with interpolations (Y-axis if present, or other complex axes) • Rapid traverse rates vs actual movement under load.	“Are there any errors during C-axis / live-tooling interpolations? Rapid travel losses under load?”
Auxiliary Systems & Accessories	• Coolant system, chip removal (chip conveyor), bar feeder (if included), tailstock, steady rest etc. • Safety guards, enclosures, mist filters. • Condition of tooling, jaws, collets, holders.	“What accessories are included? Are they all working? Any expensive missing pieces?”
Environment & Installation	• Machine foundation, levelness, alignment after transport. • Power supply condition: stable voltage, grounding, adequate amps. • Cleanliness, dust, coolant maintenance, environmental control (temperature variations).	“Has the machine been moved recently? Was it re-leveled / adjusted? How has the environment been (dust, coolant quality etc.)?”
Consumables, Spare Parts & Support	• Are consumables (bearings, seals, filters, coolant pumps) still available? What’s the cost? • Manuals, parts catalogues, service documentation. • Support options (supplier / local service techs).	“Do you have service manuals, spare parts list? Can you source parts locally? What are common replacement needs?”

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Known Weak Spots / Common Failure Modes

Some issues that are often found in Puma 230MS units or similar machines. If you see signs of the following, pay extra attention:

• Spindle wear: since the machine’s spindle is not cartridge type, replacing spindle bearings or correcting spindle wear is more difficult. If there is noise, vibration or problems with roundness/repeatability, that’s a red flag.
• Air lines / air regulators: often degrade, especially in older machines or ones that have been idle for a while. Poor air supply or worn regulators can cause pneumatic/hydraulic issues.
• Encoder / feedback / electronics faults: intermittent positioning errors (e.g. same program sometimes comes out correct, other times not, without changes) often point to encoder or servo issues, or control board issues.
• Turret indexing inaccuracy or wear: excess play or delay in tool changes; wear in turret mechanism leads to positional error.
• Coolant / chip removal systems often get neglected; dirty coolant, worn pumps, clogged conveyors reduce performance and damage parts.
• Sub-spindle alignment and condition is often overlooked: if misaligned, parts held in both spindles will suffer from concentricity / alignment issues.

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How to Decide If the Offer is Good

After your inspection & questions, you can decide using these criteria:

• Does the machine meet your tolerance, size, speed, tooling needs after likely wear is accounted for? If the machine needs refurbishment, estimate that cost and subtract from what they ask.
• Factor in all “hidden” costs: transport, install, leveling, calibration, spare parts, accessories.
• Compare to cost of other used Puma 230MS units with similar condition; also compare new or refurbished equivalents.
• Evaluate reliability: if parts are still available and there is service support, that reduces risks.
• Think of downtime and maintenance: paying a little more for one in better shape can save you much more later.