If you’re looking to buy a second-hand Willemin Macodel W 418 (5-axis machining center), here are the things you should absolutely check. I’ll include known spec ranges, common weak points, and questions to ask so you can see if a specific machine is a good deal.

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Typical Specs & What Makes W 418 Special

Here are what the spec sheets often show for the W 418:

Spec	Typical Values / Options
Axes	5-axis (X / Y / Z + B-axis swivel + C-axis rotary)
Travels (X / Y / Z)	~500 / 250 / 400 mm (or in some versions ~200 / 150 / 180 mm depending on model)
Spindle Speed	Up to ~18,000 rpm; in some versions much higher depending on spindle type, maybe up to 30,000 rpm (depends on the exact head)
Tool Holder	Usually HSK (e.g. HSK-A40)
Tool Magazine	Examples are 24 tool slots; in some listings maybe up to 48
Controller	Variants seen include NUM 1050, NUM 1060, etc.

Knowing the baseline helps you detect deviations that may be due to wear, modifications, or missing parts.

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What to Inspect / Evaluate in Person

Here’s a checklist of what to examine thoroughly, with special attention for a 5-axis machine like the W 418.

Component / Area	What to Inspect	What Problems Show Up If Not OK
Spindles	• Run at speed; feel for vibration, noise. • Check run-out (both axial & radial) on spindle nose and in the tool holding area. • Temperature rise over long runs. • Lubrication / cooling of spindle.	Wobble, bad finish, overheating, shorter life of tooling; if spindle bearings are worn, repair is expensive.
B & C Axes (articulation / rotary axes)	• Check backlash, play / looseness in the joints. • Swivel functions move smoothly at different speeds. • Check whether both axes hold positioning accurately under tool load. • Axis limits, any drift as machine heats up.	In 5-axis machining, misalignment or backlash here ruins precision; surfaces may be out of tolerance; complex parts suffer.
Guides, linear axes (X/Y/Z)	• Full travel test: does it move smoothly over full travel, no binding. • Inspect guide rails / bearings / linear ways for wear, corrosion. • Check alignment / squareness of axes and spindle.	Wear leads to drift, geometry errors, tolerance failures. If worn badly, refurbishment is expensive.
Control & Electronics	• What control type (NUM version or other), software version. • Error logs / alarm history. • Limit switches, sensors, interlocks working. • Wiring & connections: check age, insulation, cleanliness.	Old or failing control / electronics lead to downtime, random errors, parts availability issues.
Tool magazine & tool changer	• How fast tool-changes are; whether tools / holders are included. • Condition of tool holder seats; whether HSK taper is in good shape. • Magazine capacity and whether spare positions / potential interference in use.	If tool changer mis-indexes or is slow / worn, that slows production; worn holders cause vibration or poor surface finish.
Spindle / head attachments & tool interface	• Ensure correct tool taper (HSK or ISO) is present and not damaged. • Inspect any live cutting heads or attachments. Check whether they are balanced. • Check coolant supply through spindle, if available.	A damaged taper or imbalance causes vibration, shortened tool life, poor machining.
Condition of structure, enclosure & mounting	• Frame, column, base: any cracks, rust, distortion. • Enclosure doors, safety guards intact. • Whether the machine has been moved; after transport, was it re-leveled / aligned. • Floor vibration, foundation stability.	Wobble, poor precision, possible damage that isn’t visible at first glance.
Wear & usage history	• How many operating hours (on spindle, on live axes, etc.) • What kind of parts / materials were machined (hard metals vs soft) and how intensively. • Maintenance history: lubrication, coolant change, axis alignment, spindle rebuilds, etc. • Whether part-programs were heavy or light, rough vs finish work.	Heavy use without maintenance causes faster deterioration; wear may reduce lifespan significantly.
Accuracy / Test & Calibration	• Ask for measurement / calibration reports: geometry tests (squareness, repeatability, surface finish). • Run sample parts if possible; measure tolerances you care about. • Check spindle run-out. Check that B/C axes hold stated angles.	Without verified accuracy, you might buy something that won’t produce acceptable parts.
Auxiliaries & accessories	• Coolant system, filtration, coolant-through tool or spindle if needed. • Chip evacuation, conveyors, guards. • Tool probe or measuring probe (if included), work holding fixtures. • Manuals, spare parts, documentation.	Missing or broken auxiliaries reduce usefulness; spares or attachments can be expensive or hard to find.
Control options /Software / Upgradability	• Whether control features you need (5-axis simultaneous, high speed, interpolation, etc.) are present. • Software license / version; whether updates are possible. • Whether spare parts (fanuc / NUM / etc.) are available locally.	If control is old or no longer supported, repairs and software updates become costly.
Transport / Installation / Utilities	• Power supply: correct voltage / phases; stable power. • Cooling / lubrication utilities; environmental control (temperature, humidity, dust). • Move / installation: was it transported; was it re-leveled and calibrated after move. • Floor space and clearance.	Misinstallation or environment can degrade performance and accuracy significantly.

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Common Weak Spots for Willemin W 418

Based on marketplace info and user comments, these are areas that tend to cause trouble or extra cost:

• The spindle is often of high RPM and precision. If bearings or cooling are worn/neglected, repair is expensive.
• The B/C axes articulation often accumulates backlash or looseness. These need alignment; replacement of rotary axis bearings or seals can cost.
• Tool interface (HSK / spindle taper) wear: especially if users used worn holders or did tool changes improperly.
• Older control electronics (if original) may be harder to support or have spare parts delays. If the control version is Num 1050 vs 1060 vs later, that matters.
• Coolant / filtration / chip management: often neglected; build-up of swarf, poor coolant can lead to corrosion or wear.
• Documentation & spare parts: old machines may lack manuals or parts lists; some parts might be proprietary or long lead time.

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Questions to Ask the Seller

To figure out whether a particular used W 418 is worth buying, ask:

1. Operating hours: total hours, spindle hours, hours under full load vs idle.
2. Condition of B/C axes: any play, backlash, maintenance history; have they been re-calibrated or reprobed?
3. Spindle history: when was last bearing replacement; any vibrations or noise; if the spindle was overloaded.
4. Control type and version: which CNC brand, which firmware/software version, any updates; error log history.
5. Tool magazine & tool holders: do you have the holders; have they been kept in good condition; speed & accuracy of tool changes.
6. Measurement / calibration reports: can you show sample parts, test reports showing geometry, accuracy, repeatability.
7. Support equipment: coolant, filtration, chip conveyor, safety enclosure, work holding; condition of these.
8. Transport and installation history: has machine been moved; was it realigned / leveled afterward.
9. Availability of spare parts / manuals / documentation: are drawings, parts lists included; are parts still obtainable, what delivery lead time is.
10. Environmental conditions: where has it been (dust, temperature, humidity, vibration); was it in a clean shop or harsh environment.

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How to Decide If It’s a Good Deal

Finally, after gathering all that, compare:

• What tolerances and production you need vs what the machine is likely still capable of.
• What refurbishment or maintenance you’ll have to do (spindle, axes, control) and cost of those.
• Transport & installation costs, leveling, calibration after purchase.
• The price of similarly spec’d W 418 machines in your region or in Europe.
• The risk of downtime or parts delays.