Here’s a tailored evaluation guide for a pre-owned / surplus CME FS-3 CNC bed-type milling machine (made in Spain, with a rotary table / 4th axis option). Use this as your inspection roadmap, from initial screening through on-site testing to decision/negotiation.

---

Background & Reference Data for CME FS-3 (with 4th Axis Option)

Before you inspect, you need a reference to benchmark seller claims against known or plausible values.

From the CME FS Series spec sheet:

Parameter	Spec for FS-3	Notes
Longitudinal (X) travel	2,500 mm	FS-3 is the 2,500 mm X variant in the FS Series spec sheet.
Transverse (Y) travel	1,200 mm	FS series spec sheet lists 1,200 mm for Y in the FS models.
Vertical (Z) travel	1,500 mm	The spec sheet gives Z = 1,500 mm for all FS models.
Table size	2,600 × 1,000 mm	According to spec sheet for FS-3 (Table surface for FS-3)
Max table load	~ 6,000 kg	Listed in spec sheet for FS-3.
Rapid feed (axes)	20,000 mm/min (20 m/min)	In spec sheet for FS series.
Spindle power (nominal)	24 kW (S1) / 30 kW (S6)	As in FS spec sheet.
Spindle taper / mount	ISO-50 / DIN 69871	Spec sheet mentions ISO-50 as standard.
Spindle speed	50 – 4,000 RPM (standard)	Spec shows 4,000 rpm standard, 5,000 optional.
Rotary table / 4th axis	Pre-installation for 4th axis, option for rotary table	The spec sheet shows “pre-installation for 4th axis (without drive)” and “rotary table 4th axis horizontal / vertical” as options.

Other real-world listing data (from used machine ads) often show:

• A CME FS-3 listing: table 2,700 × 1,000 mm, travels X = 2,500 mm, Y = 1,200 mm, Z = 1,500 mm, rpm 20–4,000, load table 7,000 kg, in 2007 model.
• A CME FS-3 listing: X/Y/Z = 2500 / 1000 / 1,400 mm, table 2,500 × 850 mm, load 6,000 kg, spindle 4,000 rpm, ~22 kW, weight ~16,000 kg, control Heidenhain.

Use these as reference ranges. If the machine you inspect claims wildly different specs (e.g. X = 4,000 mm, rpm 12,000) without proof or upgrade documentation, that’s a red flag.

---

Pre-Screening & Documentation (Before On-Site Visit)

Before you go, gather as much as possible in writing or photos. That helps you screen out bad offers cheaply.

Ask / request:

1. Nameplate / ID plates
    – Photo of the mechanical nameplate (model, serial, year)
    – Electrical cabinet plate (voltage, phase, current rating)
2. Specification sheet / manual
    – The original or variant FS-3 spec sheet
    – Control manual, wiring diagrams, servo / drive documentation
3. Control system / CNC details
    – Brand & model of control (Heidenhain, FANUC, etc.)
    – Software version, parameter backups, tool / macro libraries
4. Operating / usage history
    – Hours logged, cutting / load hours vs idle hours
    – Type of work done (heavy roughing, fine finishing, material types)
5. Maintenance / major repairs / rebuilds
    – Spindle overhauls, guideway repairs, ball screw replacement
    – Any retrofits or upgrades (e.g. adding the rotary table, 4th axis drive)
6. List of accessories / tooling / spares included
    – Rotary table / 4th axis (if installed)
    – Collets, clamping fixtures, spare electronics, tool holders
7. Photos / video in operation
    – Rotating the spindle, axis moves, tool changes, rotary table engagement
    – Close-up photos of slides, spindles, cabling
8. Reason for sale
    – Is the machine failing, going idle, being replaced, or surplus due to relocation?
9. Shop / environmental information
    – Was the environment clean, dusty, heavy chips, coolant contamination, etc.
10. Logistics / installation info
     – Machine weight, footprint, crane / rigging access, floor strength

If seller is evasive about these, it’s a danger sign.

---

On-Site Inspection & Mechanical / Structural Checks

Bring proper measuring instruments, and if possible someone familiar with heavy mills. Work systematically from external to internal and from static to dynamic.

1. Visual / Structural / External Inspection

• Check the machine’s bed / base / frame for cracks, repairs, or distortion
• Inspect guideways / linear rails / slides in X, Y, Z axes: watch for pitting, scoring, corrosion, uneven wear
• Inspect way covers / bellows / guards: any damage or missing covers is a concern
• Examine the spindle head, milling head (incl. tilt, indexer), rotary table mounting zones
• Look for signs of coolant / oil leakage, dried buildup, seepage along slides
• Examine cable management: wiring, conduits, cable chains—look for splices, damaged insulation
• Inspect the 4th axis / rotary table (if present): mechanical integrity, bearings, backlash
• Check tool changer / magazine if installed

Try to move or lightly jog components (where safe) to detect binding or rough spots.

2. Backlash / Axis Motion / Kinematic Inspection

• Jog axes (X, Y, Z) slowly through full travel—feel for smooth motion, or zones of drag / stiction
• Use a dial indicator to measure backlash / lost motion in each axis (push-pull) in different positions
• Reverse direction near endpoints to detect hysteresis / deadband
• Check ball screws, nut play, couplings, bearings for looseness or slop
• Jog in slow feed mode and watch for inconsistencies (jerks, step changes)
• Cycle any tool indexing, head tilt / pivot, rotary table indexing multiple times to see if alignment or repeatability degrade

3. Spindle, Head / Milling Components, 4th Axis

• Run spindle at multiple speeds (low, mid, up to 4,000 rpm or higher if optional) — listen for bearing noise, vibration, roughness
• Use a test bar + dial indicator to measure runout at spindle nose / along length
• Check spindle acceleration / deceleration behavior
• Inspect the milling / indexing head for backlash, pivoting movement, mechanical play
• Test the rotary table (if installed) under no load: rotate, index, reverse, check for backlash or slop
• If the 4th axis rotates under load, test that too (if allowed)

4. Control / Electrical / Electronics / Cabinet Inspection

• Open control / power cabinet: inspect wiring, fuses, relays, driver modules
• Look for signs of overheating: discolored insulation, melted wire, burnt connectors
• Inspect servo / drive boards, interface modules, cable connectors
• Check cable routing, shielding, strain reliefs
• Power up the control: test all buttons, knobs, E-stops, limit switches, interlocks
• Navigate CNC menus: verify parameter sets, tool tables, backup memory, alarm logs
• Test safety interlocks: opening doors or guards should disable movement

---

Operational / Load Testing (Live Operation)

If seller allows, this is where you see hidden flaws.

• Perform a dry / air run of a sample machining program: tool changes, axis movement, head indexing, rotary table indexing
• Execute a test cut on a known material: evaluate surface finish, chatter, dimensional accuracy
• Run a sustained machining cycle (30–60 min) under moderate load and remeasure key axes / features before/after to detect thermal drift
• After warm-up, recheck backlash, runout, alignment to see if things shifted
• Cycle the tool changer, 4th axis indexing repeatedly to detect degradation
• If possible, run a 4th axis under load (e.g. finish a radius or contour) to see dynamic behavior

---

Precision / Metrology & Accuracy Verification

• Use gauge blocks, test bars or precision artifacts to check straightness, squareness, alignment
• Check repeatability / reversal error: move to reference, retract, return, measure deviation
• Inspect workpiece roundness, concentricity, tolerance deviations on the test cut
• After extended running, recheck dimensions to detect drift
• Compare measured tolerances to your part requirements and to published spec (±0.005 mm typical in spec sheet)

---

Infrastructure, Installation & Practical Concerns

• Confirm floor load capacity; these are very heavy machines
• Check crane / rigging / access, door heights, overhead obstructions
• Validate power supply (voltage, phase, capacity) in your workshop
• Ensure coolant system, filtration, chip removal, ventilation, and maintenance access are adequate
• Plan proper leveling, foundation, anchoring, alignment
• Confirm spare parts / service support availability from CME for FS-series machines

---

Post-Inspection Evaluation & Decision Criteria

Once you have your test data, visual observations, and dimensional measurements, use this to decide or negotiate. Here’s a decision matrix:

Category	Good / Acceptable	Red Flags / Potential Deal Breaker
Spec compliance	Travels, spindle rpm, table size, load close to spec sheet values	Big deviation in travel, spindle rpm, or claimed features not present
Mechanical condition	Slight wear, smooth movements, no binding	Severe wear on rails, binding, gouges
Backlash / motion precision	Backlash within reasonable limits, repeatability stable	Large backlash, inconsistent motion, hysteresis
Spindle / head / 4th axis health	Quiet, low runout, stable operation	Vibration, noise, slop, misalignment, overheating
Control / electronics	Clean wiring, stable operation, no alarming errors	Burnt wiring, bad drives, corrupt control modules
Operational test success	Good surface finish, dimensional control, stability	Chatter, poor finish, drift during cycles
Thermal stability	Minimal change post warm-up	Large drift or shift after hours of operation
Repair / refurbishment cost	Known parts, manageable repairs	Obsolete parts, major refurbishments needed
Support & spares	CME provides spare parts and support	Parts unavailable, limited service support
Warranty / guarantee	Seller backs performance, test-cut guarantee	“As is” sale, no recourse for hidden defects

In negotiation, use any mismatch or defect (e.g. worn ways, missing drive modules, noisy spindle, etc.) to reduce price or demand that spare parts or performance guarantees be included.