08/10/2025 By CNCBUL UK EDITOR Off

Technical Evaluation Guide: How to Identify a Quality Used, Secondhand, Pre-Owned, Surplus SORALUCE FP 8000 CNC Traveling Column Floor Type Boring Milling Machine made in Spain

1) Reference Specifications & Benchmark Values

Before you inspect the machine, obtain the machine’s build sheet. Here are typical specs for a SORALUCE FP-8000 unit (sometimes used by sellers) to use as benchmarks:

Parameter	Typical / Published Value
X (longitudinal) travel	8,000 mm
Y (transverse) travel	1,500 mm
Z (vertical) travel	2,600 mm
Table length × width	4,000 × 2,500 mm
Max workpiece load (table)	~ 40,000 kg
Spindle power	32 kW (often)
Spindle speed range	40 – 4,000 rpm (stepless)
Rapid traverse (X, Y, Z)	~ 35,000 mm/min (35 m/min)
Tool magazine	40 tools (mounting on traveling column)
Heads / milling head indexing	automatic orthogonal milling head, indexing ±1° or similar
Control & measurement	Heidenhain iTNC530 for many units
Machine footprint & weight	~ 14.5 × 6.0 m footprint; weight ~ 40,000 kg

These are just guide values. A used unit will typically deviate somewhat due to wear or prior modifications, but large deviations should raise concerns.

2) Pre-Inspection Document Request

Before you visit, request the seller to provide:

Complete build / configuration / option sheet (traverses, head types, tool magazine, retrofit history)
Serial number, build year, and machine revision records
Maintenance logs (spindle rebuilds, head servicing, way & guide replacement)
Alignment / calibration / level / geometry / test reports
CNC parameter backups, compensation tables, tool offset archives
Electrical / hydraulic / pneumatic / schematic diagrams
Tooling list (milling heads, boring heads, fixtures, probes)
Any records of crashes, collisions, or rebuilds
Spindle and head overhaul history if available

These documents serve as your baseline to compare on-site measurements and detect hidden defects.

3) Visual / Static Inspection (Machine Powered Off)

Begin with a systematic walk-around:

Frame / Base / Castings: Look for cracks, repair welds, distortion, sagging over long spans.
Travelling Column & Cross Rails: Inspect for straightness, damage, wear, or misalignment.
Table & Bed Surfaces: Check T-slot surfaces for wear, gouges, flatness.
Spindle Housing / Milling Head / Quill: Inspect taper faces, housing surfaces, exposed bearings, cracks or signs of impact.
Guideways / Rails / Linear Guides: Search for scoring, pitting, rust, uneven wear or slack zones.
Tool Magazine / Turret (if on column): Open and check pockets, grippers, indexing surfaces, looseness or play.
Heads & Head Index Mechanism: Inspect indexing ring, clutches, Hirth rings (if used), pivot surfaces.
Cable Trays / Drag Chains / Hoses: Check insulation, broken links, chafing or prior repairs.
Electrical Cabinet: Open and check wiring, discoloration, burned insulation, board condition, cleanliness.
Plumbing / Coolant / Lubrication Lines: Inspect for leaks, corroded fittings, brittle hoses, patch repairs.
Platform / Safety Guards: Verify access platforms, guards, interlocks, covers are intact.

Take detailed photos of all wear, repairs, suspicious zones, especially near ends of travel and load-bearing areas.

4) Installation & Alignment Verification

If the machine is already in place:

Verify foundation, anchorage, leveling — a machine of this size must sit on a stable, rigid base.
Use a precision straightedge, granite rail, or laser alignment tool to check column / cross-rail straightness over full travel.
Mount a test bar or indicator in spindle and test radial runout at several positions across the table (long travel).
Jog X / Y / Z axes in small increments in different zones to sense binding or nonuniform motion.
Command head indexing, and measure index repeatability / position error of the head.
At several table positions, test for squareness / parallelism to the spindle axis using dial gauges or autocollimators.

5) Power-On / Dynamic Motion & Functional Tests

With power and safety precautions:

Warm-up motion: jog all axes for 20–30 minutes to stabilize lubrication, temperature.
Home / reference cycles: repeat and confirm steady, error-free references.
Axis stroke test: jog X, Y, Z at varying speeds (slow → high), check for jerk, vibration, inconsistent speed.
Head indexing cycles: repeatedly index the milling head (if automatic) and check for mis-index or hesitation.
Spindle ramp: accelerate to rated RPM and monitor for vibration, noise, stability.
Tool change cycles: cycle magazine/tool changes to test reliability and repeatability.
Coolant & lubrication systems: activate and observe flow, pressure, leaks, and response in all zones.
Control / alarms: check for servo faults, limit trips, parameter warnings; review fault history.
During motion, monitor encoder feedback signals or digital readbacks to detect intermittent dropouts or anomalies.

6) Accuracy, Repeatability & Metrology Tests

These tests will show whether the machine is still capable for precision work:

Use laser interferometer or precision gauge to check linear accuracy / straightness in X, Y, Z axes across full travel.
Perform backlash / reversal error tests by moving ±0.01 mm and measuring direction reversal difference.
Repeat to a point (e.g. 10×) to evaluate repeatability error.
Index head repeatedly and measure the angular repeatability / positioning error of the milling head.
Run a combined interpolation move (e.g. diagonal or curved motion) and compare actual tool path vs programmed.
After sustained operation (1 hour or more), recheck the same reference points to quantify thermal drift.
Perform hysteresis tests (move, dwell, return) to see if the machine returns accurately.

7) Spindle, Head, Tooling & Wear Checks

Mount a precision test bar / arbor and measure radial runout of spindle or quill.
Use vibration analysis or careful listening at intermediate RPM to detect bearing noise or resonance.
Monitor spindle temperature over a 30-minute run.
If the head has clamping or indexing, test the locking force / retention strength.
Dye / “blue” contact test between mating surfaces to see if taper or surface contacts are even.
Cycle tool changes (if head or magazine is tool-changing) and test tool offset repeatability.
Check for head tilt, swivels, any play or slack in angular axes.

8) Lubrication, Cooling & Auxiliary Systems

Confirm lubrication oil / grease delivery to linear guides, ballscrews, head bearings—check for blockages or dry spots.
Run coolant supply system: check pump pressure, flow, leak points, cleanliness, filtration.
Inspect coolant tank, filters, separators for clogging or contamination.
Cycle chip conveyors, removal paths, flush channels.
Test any hydraulic / pneumatic actuated systems (clamps, head locks, actuators).
Verify control cabinet cooling, fans, heat sinks – ensure no overheating, stable electronics.

9) Common Wear Modes / Red Flags to Watch

Excessive wear on guideways, especially near ends of travel
Slop or play in head indexing, clutches, or pivots
Spindle bearing degradation: vibration, heat, noise
Tool magazine wear or mis-indexing
Loss of lubrication, contaminated oil causing early wear
Coolant leakage into critical mechanical spaces
Control / servo drive faults, failing boards, frequent alarms
Encoder feedback errors or dropout during motion
Cable chain failures, brittle wiring, connector corrosion

If you see multiple serious issues, the machine is risky without refurbishment.

10) Acceptance Criteria & Sample Tolerances (Benchmarks)

Below is a sample tolerance / pass-fail table you may adopt or adjust based on spec sheet:

Parameter	Target / Acceptable Tolerance
Linear axis accuracy (X, Y, Z)	± 0.010 mm over long travel (or better, depending on spec)
Backlash / reversal error	≤ 0.01 mm
Repeatability	± 0.005 mm
Head indexing / angular repeatability	≤ 0.005° (or better)
Spindle / quill radial runout	≤ 0.005 mm
Thermal drift over 1 hour	≤ 0.02 mm (or ≤ ~5 µm per m)
Tool change / head repeatability	≤ 0.01 mm deviation
Servo / current stability	Smooth traces, no sudden spikes
Noise / vibration at spindle rpm	Minimal, no bearing whine
Coolant / lubrication consistency	No significant pressure / flow drop under load

If a unit fails more than a few of the critical benchmarks (especially in spindle, guideway, or head indexing), the value will be significantly reduced unless refurbished.