24/09/2025 By CNCBUL UK EDITOR Off

Avoid Costly Mistakes: Professional Tips for Purchasing a Pre-Owned / Second-Hand / used EMCO Hyperturn 665MC Plus?

Buying a used EMCO Hyperturn 665MC Plus (or similar “turn-mill / multi-axis” variant) is a complex purchase with many moving parts. Because these machines combine turning, milling, multiple axes, and tool turrets/spindles, there are more potential failure points than in a simpler lathe or mill. Below is a professional guide—things to check, red flags, negotiation strategies—to help you avoid costly mistakes.

1. Understand the Typical Specs & Configurations

Before inspecting a candidate, arm yourself with the “expected spec envelope.” That way you’ll spot exaggerations or discrepancies.

Here are representative spec features for the 665MC Plus (based on current used listings):

Swing over bed: ~ 600 mm
Swing over cross slide / face carriage: ~ 500 mm
Maximum turning diameter: ~ 430 mm
Maximum part length: ~ 744 mm
Bar stock capacity: ~ 65 mm
X / Z travels (for main turret): ~ X = 280 mm, Z = 900 mm
Secondary turret (if present): X2 ~ 205 mm, Z2 ~ 750 mm
Y-axis travel: ~ ±50 mm (i.e. Y = 100 mm total)
Spindle speed (main): 0 – 5,000 rpm
Spindle drive (main): ~ 29 kW, torque ~ 250 Nm
Counter / sub spindle: up to ~ 7,000 rpm, ~ 22 kW
Tool turrets: often 2 turrets, each ~12 stations (with driven / live tool capability)
Milling / swivel B-axis / driven tool (PowerMill) options are often part of “Plus” configuration
C-axis indexing on spindle(s): 0.001° resolution in many listings

These give you ballpark values—if a seller claims wildly different numbers (e.g. X travel = 500 mm) that’s a red flag unless heavily modified.

2. Documentation, History & Provenance

As with any used complex machine, the more you know about its past, the better.

Service records, repair invoices, parts replacement logs — especially for spindles, turrets, electronics.
Operating hours / cycles (if available). Even though hours don’t tell everything, a machine with extremely high hours demands extra scrutiny.
Configuration and control backups / parameters — e.g. tool offsets, kinematic data, macro files.
Original manuals, electrical schematics, hydraulic / pneumatic diagrams
Modification history — whether the machine was upgraded (driven tools, milling spindle, B-axis, extra turrets) or parts replaced with non-OEM items
List of included accessories: chucks, collets, tool holders, tooling, fixturing, bar feeders, coolant systems, conveyors
Usage environment: Was it used in harsh conditions (coolant, abrasive materials, long hours)? Was maintenance regular?
Spare parts inventory (if seller includes extra bearings, seals, tool holders, etc.)

Without credible documentation, you’re entering risk territory.

3. Physical & Structural Inspection

Start with a careful visual walkthrough before powering up.

Inspect castings and structural parts (bed, columns, turret bodies, bridges) for cracks, repaired welds, distortions
Check for corrosion, rust, pitting on slideways, cross slides, dovetails, tool carrier faces
Examine way covers, bellows, guard seals, way wipers — damaged or ill-fitting covers are often correlated with internal wear
Look for oil/coolant leakage, residue, stains around spindle head, turret bearings, hydraulic units
Confirm that guards, covers, control panels, fasteners are present and undamaged
Examine attached tooling / chucks / fixtures for excessive wear, damage, misalignment

Structural issues are among the most expensive to remedy (if possible at all).

4. Motion, Spindle & Mechanism Tests

This is critical for a machine with many axes — test each axis, spindle, turret, tool drive.

Axes & Slideways

Jog each axis (X, Z, Y, any sub-axes) across full range (slow speeds and moderate speeds). Feel for jerkiness, binding, dead zones, stiffness changes
Use a dial indicator to measure backlash on each axis. Excessive backlash suggests worn screws or nuts
Detect “soft spots” or nonuniform motion—these often point to wear or alignment issues
Listen for grinding, scraping, knocking noises during motion
Inspect ball screws / lead screws / nut assemblies for wear, pitting, or irregularities
Test lubrication or oiling systems for slideways and screws: ensure lines, pumps, reservoirs are intact and functioning

Spindle(s) & Toolholding

Run the spindle (main) at different speeds (low, medium, high) without load. Listen for bearing hum, vibration, instability
Mount a test bar or mandrel; check radial and axial runout with a dial indicator over 360°
Check spindle taper or interface surfaces for damage, scarring, or wear
Test automatic tool change / turret indexing: should consistently position and repeat without hesitation
If the machine has driven tools / milling spindle / B-axis, run them (no load) and listen for vibration, stability, smooth transition
For sub-spindle or counter spindle, run similarly and verify alignment, balance, noise

Turrets & Tool Carriers

Cycle turret indexing repeatedly; watch for hesitation, misindexing, jitter
Inspect tool pocket fit, side play, wear of pocket faces
If turret includes live tooling, test each driven station (idle) for runout, vibration
Observe the mechanism (cams, gears, servo drives) during indexing for mechanical noise, backlash

5. Control, Electrical & Software Examination

The “brains” of a multi-axis turn-mill machine are equally vital; neglect here is dangerous.

Open the control / electrical cabinet; inspect for dust, burn marks, water damage, loose wiring, corrosion
Check for missing modules, drives, power supplies, communication boards
Power the control (if possible) and examine the boot process, alarm / fault log, error history
Verify that operator interface panels (buttons, encoders, screens) all function
Cycle the machine (idle) under control and monitor for heating, faults, or anomalies
Check that control parameters, configuration menus, backups, tool libraries are accessible
Verify control version / firmware and whether it is upgradable or obsolete
If the machine has network connectivity, ensure communication modules work

6. Precision & Geometric Testing

Critical for a complex machine — test it under real conditions.

Use a reference surface or granite plate to check flatness / straightness of slides
Measure squareness (X vs Z, turret face vs spindle axis) with gauge blocks / indicators
Perform tramming to ensure spindle axis aligns correctly with respect to work axis
Conduct a test cut: do a finish pass on a known material, measure features (diameter, straightness, roundness, surface finish) at various positions
Test repeatability: retract and re-approach same position, measure deviation
Check performance near the ends of travel as well as mid-range; machines often degrade at extremes
Verify that milling / driven tool cuts produce acceptable results (if present)

7. Hidden Costs & Risk Items to Assume

Even if the machine seems “fine,” you should budget for these likely repairs or upgrades:

Spindle rebuild or bearing replacement (main or sub-spindle)
Ball screw / nut replacement or refurbishment
Slideway reconditioning or scraping / alignment work
Repair / rebuild of turrets, indexing mechanisms, live tool drives
Control or electronic module replacement or upgrades (especially if parts are obsolete)
Cable harness refresh, connector replacement, aging insulation
Calibration, alignment, tuning after installation
Transport, rigging, leveling, foundation work, utilities installation
Downtime during setup, alignment, and initial trials
Sourcing of spare parts; some OEM parts may no longer be produced or available easily

Also consider the availability of aftermarket support: some older control electronics or turret drives may be difficult to service if they’re out of production.

8. Negotiation & Deal Structuring

You want to protect yourself, because “looks good” doesn’t guarantee performance.

Insist on an inspection period where you can run the machine fully (axes, spindles, tool change, test cuts) before final payment
Withhold a portion of payment until after your acceptance tests
Require delivery of all documentation (manuals, schematics, control backups) as part of the sale
Ask for a short-term guarantee (e.g. 30–90 days) covering major systems (spindles, turrets, drives)
Request disclosure of any known problems in writing (so you’re not surprised post-purchase)
If possible, negotiate inclusion of spare parts / tooling / fixtures in the deal
Ask seller to assist (or subcontract) setup, alignment, calibration at your site
Confirm responsibility for transport, rigging, leveling, and insurance during transit