Here’s a professional-grade guide (with pitfalls to avoid) for purchasing a used MAS / MASTURN 32 (or similar “cycle lathe / CNC lathe”). Because your inquiry is somewhat generic (“MASTURN 32 CNC / cycle lathe”) I’ll assume the variant is similar to known MAS MASTURN 32 specs (e.g. 160×800 mm, Heidenhain control, 50 mm spindle bore)

---

1. Know the Baseline / Typical Specs First

Before you go onsite, gather what typical spec ranges are for the MASTURN 32 model so you can spot exaggerations or mismatches. From multiple sources:

Parameter	Typical / Quoted Value(s)
Swing over bed / ways	~ 320 mm (i.e. ~12.6 in)
Turning length (between centers)	~ 800 mm
Spindle bore	~ 50 mm
Spindle speed / rpm	~ 4,000 rpm (2 ranges)
Motor power	~ 7 kW
Tailstock quill / stroke	~ 125 mm
Control / CNC system	Heidenhain (e.g. Heidenhain Manual Plus 4110) on some versions

Use these as your “expected envelope” when checking seller claims. If a seller claims swing 500 mm, or 10,000 rpm (unless modified), that’s suspect.

---

2. Documentation & Machine History

This is one of the most important defense lines against surprises.

Ask the seller for:

• Original manuals, wiring diagrams, parts lists
• Maintenance / repair logs (especially for spindle, bearings, drives)
• Control program backups, parameter files, tool libraries
• Usage history: was the machine used heavily (continuous shifts), or lightly? What materials was it used on?
• Modifications or retrofits: was the spindle changed, CNC upgraded, drives swapped?
• What’s included: chucks, toolholding, fixture plates, tailstock, collets, steady rests, spare parts
• Inspection / calibration history: whether it’s been aligned, scraped, or rebuilt recently

If the seller has no records or claims “as-is only,” that raises your risk significantly.

---

3. Visual / Structural Inspection (Before Power-Up)

Walk around the machine and inspect all visible parts carefully.

• Check the bed, saddle, cross slide, carriage for wear, scratches, pitting, gouges, rust, or repairs
• Inspect way covers, bellows, guards: missing or damaged covers often indicate internal damage or neglect
• Look for rust, corrosion, pitting especially on exposed surfaces
• Check the spindle housing, headstock, external flanges for leaks, stains, coolant residue
• Look at the tailstock, quill, tailstock slide for damage, misalignment
• Inspect electrical enclosures, cable trays, wiring ducts, junction boxes for signs of corrosion, water damage, or burn marks
• Ensure all panels, guards, fasteners are in place (loose or missing covers are bad sign)
• Inspect the tool turret (if present) or tool changer mechanism for visible wear or misalignment

Structural damage or distortion is often expensive or impossible to fully correct later.

---

4. Mechanical & Motion Tests (With Power / Under No Load)

Once the machine is powered (if seller allows), test how the machine moves and feels.

Axes / Slideways / Drive Motion

• Jog axes (X, Z as applicable) across full travel (slow, mid speed) — you should feel smooth motion, no jerks, binding, or dead spots
• Use a dial indicator or test indicator to measure backlash in X, Z axes. Excessive backlash is a red flag.
• Feel for “soft zones” or movements that are inconsistent — these often indicate localized wear or alignment issues
• Listen for grinding, metallic contact, or scraping noises during motion
• Inspect the leadscrew / ball screw / feed screw and nuts: any signs of wear, play, or damage
• Check lubrication: are the oil / grease lines, reservoirs, pumps, etc., intact and functioning?

Spindle & Toolholding

• Run spindle (no load) at multiple speeds (low, motor max) and listen for vibration, bearing hum, or unusual noise
• Mount a test bar or mandrel in the spindle; measure radial and axial runout with a dial indicator over 360°
• Inspect the spindle bore / taper for nicks, wear, damage
• If a tool turret or tool changer is present, cycle it through tool changes to see if it indexes smoothly and reproducibly
• Test tool mounting / releasing (collets, tool holders) to see if there’s play or looseness

Tailstock & Quill

• Extend and retract the tailstock quill; it should be smooth without binding
• Check tailstock alignment to spindle axis (use test bar or indicator)
• Inspect quill for wear, burrs, or damage

---

5. Geometric Accuracy & Test Cuts

These are the “prove-it” tests. Even a machine that moves OK may not hold precision.

• Use a master or reference (ground bar or test shaft) and mount it; measure runout, cylindricity, taper over length
• Retract and come back to the same point; test repeatability
• Perform a light finish cut/pass; measure parts (diameter, straightness, roundness) at multiple points along workpiece
• Perform tests at near beginning and near end of travel — many machines degrade at extremes
• Check parallelism of slide movement, squareness (X vs Z), alignment of tool turret / tool axis vs spindle
• If the machine has a “cycle lathe” mode (automated sequence), run a full cycle test with fixture & tools to see if cycles complete properly

---

6. Auxiliary Systems & Tooling

Don’t ignore the supporting systems — their condition often determines usability.

• Coolant system: pump, pipes, filtration, valves, leaks, flow
• Chip conveyor, chip handling, guard / covers
• Tooling: chucks, collets, fixtures — what’s included and their condition
• Tool turret or changer: indexing mechanism, drives, cams, repeatability
• Electrical / control panels, wiring, interface modules, operator panel, displays, encoders
• Safety systems: interlocks, emergency stops, door sensors

---

7. Hidden / Future Cost Risks

Even if the machine seems “OK,” many problems surface later.

• Spindle rebuild or bearing replacement
• Replacing worn screws, nuts, guides
• Scraping / recondition of slides / ways
• Repair / overhaul of turret / tool changer drives
• Upgrading or repairing control electronics (especially for older CNC modules)
• Wiring harness / cable replacement
• Calibration, alignment, setup after transport
• Transport, rigging, foundation, leveling
• Downtime during overhaul
• Obsolete parts unavailability (control modules, servo drives, spindle parts)

---

8. Negotiation & Deal Structure to Protect Yourself

Use your inspection leverage in the deal.

• Insist on inspection / acceptance period (e.g. run cycles, test cuts) before final payment
• Withhold some payment until machine passes acceptance tests
• Make the sale contingent on supply of all documentation (manuals, schematics, backup files)
• Ask seller to disclose known defects or issue a “condition statement” in writing
• If possible, have a short-term guarantee on major systems (spindle, drives)
• Include in the contract who is responsible for rigging, transport, leveling, alignment
• Try to include spare parts, tooling, fixtures as part of the deal
• Insist the seller assist with setup / alignment (or at least provide guidance)

---

9. Red Flags & Walk-Away Conditions

Some issues are too serious to accept without steep discount or risk. Watch for:

• Seller refuses full access, restricts motion or testing
• Excessive backlash or binding in axes
• Spindle noise, vibration, or unacceptable runout
• Tool turret or tool changer misindexing, refusing to reposition
• Tailstock misalignment, quill binding
• Electrical cabinets showing burn marks, missing modules, corrosion, water damage
• Control / program interface is inaccessible or corrupted
• Major components missing (drive modules, tool modules, wiring)
• Structural damage, cracked casting or heavy repair evidence
• Retrofits done poorly (welds, misalignments)