Here is a step-by-step checklist to evaluate a used, second-hand or surplus YCM NFX 380A 5-axis vertical machining centre (VMC). The aim is to help you make the right move when purchasing this machine for your workshop.

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1. Understand the machine’s base specs & features

Before evaluating a particular unit, you should know what the machine should deliver. Key specs include:

• The NFX 380A is a 5-axis VMC built by YCM (Taiwan) for high-precision applications — aerospace, automotive, die & mould, medical.
• Example spec: Table Ø 380 mm, thru-hole Ø 80 mm; A-axis tilt +30° / -120°; C-axis full 360°.
• Spindle: typically 12,000 rpm standard, with options up to 15,000 rpm.
• Travels (approx): X ~700 mm, Y ~520 mm, Z ~480 mm (depending on version).
• Indexing/rotary axes: quality of A/C axes is critical in 5-axis machines.

Why this matters: Knowing the nominal specs helps you assess if the unit you’re buying matches the advertised capability (or if it is a downgraded version). It also helps you judge wear and cost justification.

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2. Check the machine’s history & usage

• Ask for the year of manufacture and hours of operation (or part count, if available).
• Determine the type of work it has been used for: heavy roughing, finishing, delicate work, etc. Heavy roughing can accelerate wear.
• Check for maintenance records: lubrication system serviced, spindle bearings replaced, ballscrews checked, ways scraped or re-leveled.
• Determine if the machine has been moved, re-installed, or had any major repairs (this can affect alignment/accuracy).

Red flags to watch for:

• Very high hours (> 20,000) without overhaul in 5-axis context.
• No records of angular‐axis calibration (A/C axes).
• Signs of abuse: e.g., large-volume heavy cuts well beyond capabilities (for example, if used for heavy moulding rather than high-precision finishing).

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3. Physical inspection — Structure, axes, table & spindle

Structure & axes

• Inspect the machine body (column, base, saddle) for cracks, chip damage, weld repairs, or corrosion.
• Check the linear guideways and ballscrews for wear: sideways play or “sloppy” motion is a concern. The NFX 380A uses high-rigidity casting and pre-tensioned screws.
• Check the rotary axes (A and C): play in these axes will impact 5-axis precision. Index the table, tilt A-axis, move C-axis full circle — feel for backlash, repeatability, noise.

Table & work envelope

• Verify the table size, throughput hole, table load rating. For example: Ø380mm table, Ø80mm thru-hole.
• Check flatness and level of the table; any major deviation means re-leveling or resurfacing may be required.

Spindle & tooling

• Check spindle run-out (use a dial indicator on a test bar).
• Inspect spindle bearings: listen for noise, check vibration.
• Verify spindle speed: if 12,000 rpm is standard, ensure it attains that. Some may have been upgraded or downgraded; check what you are getting.
• Check the tool magazine/ATC: look for wear, jamming, tool change times.

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4. Controls, servo drives and electronics

• Confirm which CNC control the machine uses (e.g., Fanuc, Heidenhain or others) and whether the 5-axis control functions are fully operational (tilt table, A/C axes, simulation). The brochure mentions FANUC MXP-200 FB/FC standard for 5-axis.
• Check for any error codes, alarm history, and whether the software is up-to-date.
• Check servo drives, power modules, wiring for signs of overheating or modifications.
• Test motion: move all axes at rapid, feed, and check for smoothness.
• Check if spindle cooling, table temperature control, probe (if fitted) and other optional features are in place and working.

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5. Accuracy tests & calibration

• Perform a ball-bar test or worst case a simpler positional accuracy check: move to defined points, measure with test instrument (dial indicator or better).
• Check repeatability of the A and C axes (tilt and full rotation). Any “slop” here reduces true 5-axis value.
• Measure tool tip run-out, tool change repeatability, and table positional repeatability.
• Verify any compensation tables have been maintained (e.g., for rotary axes, kinematic compensation). The brochure mentions “Kinematic Compensation” functions.
• Ask if the machine has been recently re-leveled and had its geometry checked – if not, budget for this.

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6. Wear items and services needed

• Guideways and screws: check for wear and backlash. Replacement or re-grinding can be expensive.
• Rotary table bearings: A/C axes may wear more than linear axes depending on usage.
• Spindle bearings: if worn, the spindle rebuild is a major cost.
• Tool magazine/ATC: wear parts like grippers, motors, belts.
• Cooling & lubrication systems: check if the machine has had regular fluid changes, filter changes, sealed servo cabinets, and the coolant system is clean (especially for 5-axis precision work).
• Replacement parts availability: Because it’s a Taiwanese machine, ensure parts for YCM and its control/drive systems are accessible in your region (e.g., your country /EU).
• Software license and backup: ensure you get the licence and any proprietary software (for 5-axis control) transferred.

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7. Logistics, installation, and ongoing support

• Shipping & installation: a 5-axis machine adds complexity (rotary table, tilt axes) — budget for leveling, alignment, calibration, and possibly vibration isolation.
• Floor space, foundation: check machine weight and require robust foundation for stability.
• Power requirements: check voltage, phases, spindle cooling, compressor (if required).
• Service & support: check if YCM has representation in your region or if there are experienced service providers for YCM machines.
• Training & programming: 5-axis machining has a steep learning curve — make sure you or your operator are trained.

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8. Asking the seller — key questions

• What is the exact model designation? (NFX 380A / NFX 380A-5AX / any option e.g., 15,000 rpm, 60 tools etc.)
• What control version and software version are installed?
• Which accessories or options are included? (Probes, tool-length measurement, coolant thru spindle, 60-tool magazine, chip conveyor etc.)
• Why is the machine being sold? Any hidden issues?
• Can you see it running under load? A demo is critical.
• Are there any known issues, repair records, parts replaced (especially spindle or A/C axes)?
• What condition is the foundation/installation in? Has it been moved?
• What spares are included? Any leftover tooling, trays, documentation?
• Are all axis motors/encoders original or have any been replaced with third-party units?
• What is the maintenance history? Are service logs available?
• Is there a service contract or possibility to get one after purchase?

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9. Pricing & value consideration

• Compare current used listings: e.g., a 2019 YCM NFX 380A used listing
• Consider total cost of ownership: purchase price + shipping + installation + calibration + any required refurbishing + lost production time.
• Because it’s a high-spec 5-axis machine, precision and uptime matter – cheaper isn’t always better if it needs major overhaul.
• Ensure you have budget for potential wear items (rotary table, spindle bearing) in next 12-24 months.

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10. Final decision checklist

Before you sign, ensure all of the following are yes:

Check	Status
Machine produced by YCM and correct model (NFX 380A)	______
Main specs meet your required work envelope/spindle speed	______
A/C axes are in good working order (no play/backlash)	______
Spindle performance verified (run-out, noise)	______
Full demo under real load (ideally your part)	______
Maintenance/service history provided	______
Control system software meets your needs	______
Installation requirements (foundation, power, space) feasible	______
Spare parts available / local support present	______
Total cost (used price + transport + install + calibration) fits budget	______

If you answer “no” or “unsure” to any of these, you should either negotiate the price down or walk away.

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Summary

Buying a used YCM NFX 380A can be a smart investment if you carefully inspect the machine, confirm the 5-axis functionality, assess wear, and ensure the total cost of ownership is manageable. Because 5-axis machines bring significantly more complexity than standard 3-axis VMCs, the rotary axes, spindle health, and control software are especially critical. Use this checklist as your guide to minimise risk and maximise value.