When buying a second-hand Mori Seiki MV-653/50 (a Japanese-made CNC vertical machining center), you want to go well beyond the price tag. Used machines vary enormously in condition and usability — the goal is to avoid surprises (poor accuracy, downtime, unexpected repair costs) and get a machine that can operate reliably for years.

Here’s a complete checklist of what to pay attention to:

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1. Machine History & Documentation

✔️ Usage history: Was it used for light precision work, or heavy cutting?
✔️ Operating hours / table cycles: High hours can mean wear.
✔️ Maintenance records: Regular lube, spindle checks, alignment checks are extremely valuable.
✔️ Reason for sale: Downsizing? Malfunction? Obsolescence?
✔️ Original manuals, parts list & service documentation: These aid in maintenance and troubleshooting.

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2. Physical & Mechanical Condition

Frame & Structure

• Look for cracks, repairs, welds, or signs of accidental damage.
• Check for rust or corrosion, especially in coolant areas.

Guideways & Ballscrews

• Check wear on ways — uneven wear leads to loss of precision.
• Look for pitting or scoring.
• Confirm ballscrew backlash is within tolerance.

Spindle

• Check for spindle noise, vibration, runout. Excessive runout → bad bearings or worn taper.
• Ask for spindle speed history and maintenance logs.
• Confirm spindle holds runout within spec.

Axis Movement

• Move all axes lock-to-lock: listen for grinding, backlash, steps lost, uneven motion.
• Check all limit/home switches operate correctly.

Tool Changer & Magazine

• Check for chatter, jams, misloads, broken inserts.
• Count tools and examine tool holders & pockets.

Coolant & Chip Management

• Condition of pumps, filters, hoses
• Look for clogs, rust, leaks
• Check chip conveyor operation

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3. Electrical & Control System

Controller

• Confirm it has the right controller/version (FANUC/MORI control specs).
• Ask for backup files/parameters.
• Check for unusual error history or alarms in the log.

Wiring

• Inspect for burn marks, frayed cabling, loose connections.
• Make sure grounding is proper.

Displays, Panels & Switches

• All keys/buttons should work; look for dead pixels, ghosting, cracked screens.

Servo Drives & Motors

• Confirm each axis works smoothly.
• Listen for servo faults, thermal shutdowns.

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4. Performance Checks

If possible, run the machine:

Test Run

• Run a G-code program and watch for smooth motion.
• Check acceleration, deceleration, contouring, feed accuracy.

Cutting Test

• A short test part will reveal:
  • Surface finish
  • Dimensional accuracy
  • Machine chatter / vibration
  • Thermal drift

Precision

Ask for or conduct:

• Ballbar test
• Laser interferometry
• Squareness & backlash measurement

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5. Parts & Support Availability

This is often overlooked but critical:

• Availability of replacement parts for MV-653/50
• Lead times & cost of parts (bearings, linear guides, drives, spindles)
• Service support / technicians familiar with Mori Seiki in your region

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6. Spare Parts Inventory

Does the seller include:

• Tool holders
• Collets & chucks
• Extra belts, fuses, connectors
  These save costs early on.

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7. Logistics & Installation

✔️ Rigging & transport cost (heavy mill → expensive move).
✔️ Leveling and foundation requirements.
✔️ Electrical supply compatibility (voltage, frequency!).
✔️ Coolant & air supply needs.

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8. Pricing & Valuation

Don’t pay based on age alone. Consider:

• Hours / cycles
• Condition & maintenance history
• Included accessories (probes, tool presetter, fixtures, software)
• Warranty or inspection report

Suggested pricing strategy:
✔️ Start with market comps for similar machines
✔️ Deduct for:

• Excess hours / poor maintenance
• Missing documentation
• Repair needs

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9. Inspection & Pre-Purchase Check

Whenever possible:
Bring a machine tech or inspector experienced with Mori Seiki/VMCs.
Get a pre-purchase inspection report.

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10. Common Problem Areas for Older VMCs

Watch out for:

• Way wear
• Ballscrew backlash
• Spindle bearing wear
• Faulty tool changer mechanisms
• Coolant pump failures
• Control board age/failures

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Checklist to Print & Use On-Site

Before buying, tick off:

Item	Pass / Fail	Notes
Guideway condition	☐
Spindle runout	☐
Axis backlash	☐
Controller errors	☐
Test cut performance	☐
Tool changer function	☐
Coolant system health	☐
Electrical panel condition	☐
Documentation complete	☐
Spare parts included	☐

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Summary of Key Areas

Mechanical health → Control reliability → Performance test → Documentation → Support availability