25/10/2025 By CNCBUL UK EDITOR Off

From Inspection to Installation: What to Verify Before Buying a Pre-Owned, Used, Secondhand, Surplus DMG MORI NT5400 DCG/1800S CNC Multi-Tasking Machine made in German & Japan

Some key specs of the NT5400 DCG series:

Max workpiece diameter ~ 920 mm (36.2 in) for NT5400 DCG.
Max workpiece length ~ 1,921 mm (75.6 in) for the “/1800” variant.
X-axis travel ~ 1,040 mm (40.9 in), Y ~ ±255 mm (~10 in) in some configurations.
B-axis capability ±120° (for 5-axis contouring versions) in many NT5400 DCG machines.
These machines are built in Germany & Japan (DMG MORI / Mori Seiki), high precision integrated turn + mill machines.

Because you’re dealing with a high-value, complex multi-tasking machine, you’ll want a very thorough set of verifications.

1. Pre-Inspection / Technical Condition

Inspect the machine frame, bed, turrets, sub-spindle and primary spindle for signs of excessive wear, repairs, corrosion, cracks, welds.
Check the axis guideways, dynamic components (turrets, spindles, B/Y axis mechanisms) for unusual wear, misalignment, play or vibration.
Check the dual-spindle / sub-spindle system (if present) for correct alignment, bearing condition, hydraulics.
Verify tooling interfaces (e.g., turret tool holders, live tooling spindles, Capto tooling if used) are intact and not overly worn.
Review control panel condition: screen, buttons, pendant, retrofit elements.
Check for oil leaks, coolant leaks, chip accumulation, cleanliness of the machine overall (often a sign of how well it was maintained).

Confirm the exact model variant (e.g., “/1800S” or “/1800SZ”) and compare with the spec sheets to verify what the machine should deliver.
Check the machine’s axis travels (X/Y/Z) against spec. For example, NT5400 DCG has X ≈ 1,040 mm, Y ≈ 510 mm (20.1 in) in some versions.
Check spindle speeds, spindle bore/bar capacity: e.g., bar capacity ~ 103 mm (4.1 in).
Confirm the number of axis, whether B-axis and C-axis are present, turret live tooling etc. For example, some listings: 9 axis, B axis ±120°, live milling/turret.
Review usage hours: total spindle hours, feed drive hours, turret cycle counts. High hours mean more wear.
Review service/maintenance history: replacement of major components (spindles, drives, live tools, bearings, hydraulics). Original manufacturer parts?
Inspect the tool magazine/ATC system: check condition, response time, tool change reliability.
For Y-axis machines (if Y axis is present), check Y travel, check backlash and repeatability.

Request a live demo or test run: cut/mill a representative part to check cycle times, tool change time, chatter, surface finish.
Check live tooling and C/B axis functionality (if applicable): tool life, spindle run-out, indexing accuracy.
Check axis backlash, servo response, including turrets, ID/OD tooling, sub-spindle operation.
Check control system: verify program memory, backup, software version, any custom macros or additions. Ensure the control is still supported.
Check auxiliary systems: coolant system, chip conveyor, hydraulics/pneumatics, tool presetter (if present).
Check alignment: spindle to turret, turret to bed, dual spindles alignment (if present), tailstock (if present) alignment.

Get the original documentation: manuals, wiring diagrams, maintenance logs, parts lists.
Ask for a list of installed options and modifications, and verify against the machine.
Confirm the machine has not been severely abused (e.g., heavy duty production of hard materials beyond spec, or uncontrolled chip removal) and that it comes from a good environment (clean, temperature stable).
Ask for parts that are likely to wear out in future (live tool spindles, B/C axis bearings, turrets, drives) and whether stock of parts or refurb options are available in your region.

Location of the machine: in Europe/USA/Japan? Shipping to your country will involve transport, customs, duties, installation cost.
Machine footprint and foundation: verify what space the machine takes including turrets, chip conveyors, access doors. Check floor load, vibration isolation requirements, anchors.
Electrical requirements: large multi-task machines often require high power supply, three phase, high kVA, possibly a transformer. Also check spindle motors, coolant pumps, chip conveyors.
Services/utility requirements: compressed air, coolant/chiller units, extraction of chips and coolant, hydraulic systems.
Disassembly & transport: dual spindles, turrets, turrets with heavy milling heads, long bed machines — may need special rigging and transport preparation.
Installation cost: including alignment, leveling, machine zeroing, software updates, parameter verification, test pieces.
Spare parts & support in your country: check availability of DMG MORI / Mori Seiki parts, local service network.
Downtime risk: plan for installation downtime, material setup, operator training.

Foundation and leveling: ensure bed is level, anchored properly, check machine stability before running heavy milling/turning.
Alignment verification: spindle alignment, turret alignment, dual spindles alignment, B/C axis calibration.
Parameter verification: drive parameters, backlash compensation, spindle balancing, tool offset compensation, live tool spindle runout.
Software/Control updates: ensure the control software (e.g., MAPPS, Fanuc/SMX) is current, all necessary licenses and keys present.
Safety & guard checks: all protective covers, interlocks, chips extraction, coolant containment, emergency stops working.
Trial production: run several test parts under expected production conditions, verify accuracy, repeatability, cycle time.
Documentation: get a commissioning report with readings of key metrics (e.g., axis repeatability, spindle runout, chatter levels, surface finish) to have baseline for future maintenance.