Here’s a detailed guide you can use (or adapt) when evaluating a pre-owned / surplus Rafamet UBB 112 wheel lathe (made in Poland). Because wheel lathes are large, specialized machines (for railway wheelsets), there are extra risks and unique checks beyond a “regular” lathe. Use the framework below during on-site inspections, plus follow-up analysis and decision making.

---

Known / Typical Specifications & Context for the Rafamet UBB 112

Before you go, it helps to know what is typical or expected for a UBB 112. This way you can spot deviations or exaggerations. Based on public listings and machine documentation:

• Maker / origin: Rafamet, Poland (Polish railway / heavy machine tool firm)
• Wheel diameter turning: ~ 700 – 1,120 mm (i.e. wheels of diameter in that range)
• Wheelset axle length (center-to-center): ~ 1,640 – 2,800 mm (i.e. can accommodate wheelsets of that length)
• Maximum wheel width (tread / tyre width): ~ 150 mm
• Motor / drive power: listings show ~ 60 kW (or sometimes 80 kW) for main drive
• Approximate weight / mass: heavy machine — e.g. one listing shows 40,500 kg (≈ 40.5 tonnes)
• Control system type: in “Rafamet UBB 112 CNC wheel lathe” documentation, the control is a Siemens SINUMERIK 840D for the saddles, coordinating the turning cycles, etc.
• Typical operations: turning wheel tread profile, turning wheel rim inner surfaces, possibly turning outer rim surfaces, measurement heads, automatic cycles, etc.

Use those as anchors or “checkpoints” during your evaluation — if what the seller claims is wildly outside those bounds, that’s a red flag.

---

Evaluation / Inspection Checklist for a Rafamet UBB 112 Wheel Lathe

Below is a structured approach (pre-screening, on-site mechanical & electrical inspection, operational testing, and final decision analysis) specifically tailored for a railway wheel lathe like the UBB 112.

You may wish to convert this into a printable checklist for use on the shop floor.

1. Pre-Screening & Document Review (Before Visiting)

Before going onsite, request or collect the following:

Document / Data	Why It’s Important	What to Look For / Ask
Machine drawings, layout, as-built drawings	Helps you plan for space, rigging, foundation, utilities	Are the drawings original or updated? Any modifications or rework?
Serial number, model variation, year of manufacture	To track parts, recognize upgrades or obsolete configs	Ask for nameplate photos, manufacturer records
Operation / maintenance logs, repair history	Reveals how well the machine was maintained, what major repairs occurred	Look for spindle rebuilds, slide rework, control or electronics replacements
List of included accessories / tooling / spare parts	For value and contingent costs	E.g. jaws, measuring heads, controllers, sensors, spare drives
Photos / videos of the machine in operation	For preliminary assessment (rust, wiring, motion, leaks)	Ask for close-ups of slides, gearboxes, control cabinet
Electrical schematics, control logic diagrams	Essential for diagnosing and future repairs	Are they up-to-date, complete, legible?
Reason for sale	If the seller is upgrading vs retiring due to failure	Ask if there was a known fault or breakdown
Floor plan & shop infrastructure info	To check whether your shop can host the machine	Clearances, crane access, floor strength, power capacity
Manufacturer manuals / parts catalogs	Vital for servicing the machine later	Do you have both mechanical and electrical / control manuals?

If the seller can’t produce many of these, that reduces confidence.

2. On-Site Mechanical & Structural Inspection

Once you’re on location, start with a detailed mechanical / structural inspection. Many hidden defects surface in this phase.

2.1 Structural & Frame

• Examine the bed cast iron structure for cracks, repairs, welds, distortion
• Check guideways / slideways on the bed and saddles: look for scoring, pitting, rust, wear
• Check flatness / straightness of bed reference surfaces (if you bring a long straightedge or precision bar)
• Inspect how the bed is mounted—anchoring, grouting, shims, base plates
• Check alignment of headstocks / centers relative to bed (are they skewed?)
• Inspect way covers, guard covers, bellows—damage, tear, loose covers
• Inspect chucks / centers / clamping jaws: wear, play, clamping inserts
• Check hydraulic / clamping systems (cylinders, hoses, seals) for leakage or deterioration
• Inspect the measuring / positioning heads (if present) for wear or misalignment

2.2 Drives, Motors & Motion Components

• Manually (or with power off) move saddles, headstocks to feel for binding, gritty motion, drag
• Use test indicators to check backlash / lost motion in axes (feed screws, ball screws, nut wear)
• Inspect ball screws, leadscrews, couplings, joints for looseness or wear
• Cycle headstocks / saddles through their full travel zones; listen/feel for anomalies
• Test hydraulic or mechanical clamping of headstocks to the bed: do they clamp firmly, without play
• Operate retraction / extension of center spindles or clamping devices and observe smoothness
• Inspect drive motors, gearboxes, belts/couplings, lubrication systems

2.3 Machine Weight, Foundation & Mounting Check

• Check whether the floor and foundation are adequate (machine is extremely heavy)
• Look at machine leveling, whether the machine appears settled, if there are gaps in base plates
• Check for previous movement / shifting (cracks, bolt deformation)
• Check whether the machine has been relocated before; evidence of reinstallation damage

3. Electrical, Control & Diagnostic Inspection

This phase often reveals “sleeper” problems that can be expensive later.

• Open the electrical / control cabinet: inspect wiring, terminal blocks, connectors, fuses, relays
• Look for discoloration, burn marks, melted insulation, overheating signs
• Inspect drive inverters, servo modules, control boards, interface cards for damage or corrosion
• Check cable routing, shielding, protective conduit, cable flex joints
• Test all buttons, switches, e-stops, interlock circuits, control panel functions
• Turn on the control system, navigate menus, inspect error / alarm logs
• If possible, verify that the control logic diagrams / PLC code match the as-built wiring
• Test safety interlocks (doors open → motion stops, limit switches)
• Check diagnostic functions: does the control warn of motion overloads, axis deviations, etc.
• Inspect power supply for stability, grounding, circuit integrity

4. Operational / Functional / Test Run

This is among the most critical parts: seeing how the machine performs under motion and load.

• Power up the machine and gradually jog each axis; observe smoothness, vibrations, unusual noises
• Cycle saddle motion, headstock movement, clamping / unclamping, centering devices
• Perform a “dry run” (in air) of a turning cycle (without cutting) to verify motion, toolpath, coordination
• If seller agrees, perform a test cut / wheel set turning: check profile, surface finish, deviations
• Monitor machine behavior over a prolonged run ≥ 30 minutes: look for thermal drift, position shift, vibration, noise changes
• Re-test key measurement points after warm-up (backlash, alignment)
• Test hydraulic systems under load (e.g. headstock clamping)
• Operate the measuring / positioning heads (if present), see if they remain accurate
• Test variation over repeats: e.g. move to a point, retract, reapproach, measure deviation

5. Metrology & Precision Checks

Because wheel lathes require tight geometric control, you want to perform checks:

• Use known reference gauges, straightedges, or test bars to verify alignment, flatness, straightness
• Check run-out, radial deviation, concentricity on test wheels or dummy workpieces
• Inspect profile accuracy (if possible) using measurement heads or external measurement devices
• Re-check after warm-up / prolonged run to see drift
• Evaluate backlash, hysteresis, repeatability across full travel
• Compare measured performance against published specs (ovalities, run-outs, tolerances) from Rafamet documentation

6. Infrastructure / Installation & Risk Assessment

• Check whether shop floor supports the machine’s weight and dynamic load
• Verify rigging, removal access, crane or lifting equipment is adequate
• Ensure utilities: power (voltage, current, phase), cooling systems, hydraulic supply, compressed air
• Check ventilation, chip / swarf removal, working space around machine
• Evaluate safety systems: guards, interlocks, access, emergency systems
• Consider spare part availability, OEM support for Rafamet machines

7. Post-Inspection Evaluation & Decision Criteria

After the onsite inspection, consolidate all your findings and decide whether to proceed (or negotiate). Consider:

• Deviation from specs: Are key metrics (axis travel, wheel sizes, motor power) close to expected values?
• Wear & defects found: Are the guideways, screws, spindles, clamping systems in tolerable condition or need major repair?
• Control & electronics health: Are the control system, diagnostics, wiring, modules in decent state, or are there serious red flags?
• Repair / refurbishment costs: Estimate what it would cost to recondition or replace components (bearings, slides, control boards)
• Risk of hidden failure: Some issues (e.g. intermittent electronic faults, thermal distortions) only show up later
• Spare parts / control support: Are spare boards, modules, sensors for Rafamet UBB 112 still available (or adaptable)?
• Test-cut performance: Did the machine produce acceptable wheel profiles and finishes during test cuts?
• Mechanical alignment stability: Did performance degrade over extended testing or drift?
• Total cost vs value: Combine purchase price + repair + transport + downtime vs value of a better machine
• Negotiation leverage: Use the defects you discovered to reduce price or demand spares/guarantees

If too many major issues exist (e.g. structural damage, control corruption, severe wear), it may be safer to reject or walk away.