Here are professional tips, red-flags, and what to verify when considering a used Fanuc Robodrill α-T21iFLa (or similar “Alpha / Robodrill T21i-FL / T21iFLa”) vertical machining center. This helps you avoid expensive surprises.

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What to Know Up Front: Specs & What to Expect

Knowing the typical spec of a T21iFLa helps you benchmark what the seller claims. From used listings:

Spec	Typical / Published for T21iFLa
Control	Fanuc 31i-A5 (or similar Fanuc 31i series)
Travels (X × Y × Z)	~ 27.5″ × 15.7″ × 12.99″ (≈ 700 × 400 × 330 mm)
Table size	~ 33.5″ × ~ 16.1″ (≈ 850 × 410 mm)
Spindle speed / taper	Usually ~ 10,000 RPM; BT-30 taper (some units may have high speed variants)
ATC (Tool changer)	~ 21 slots in many units listed
Rapid traverse / feed rates	Rapid traverse up to ~ 2,125 IPM in X/Y/Z in several listings

These are your baseline. If you see anything significantly worse (e.g. low spindle speed, less rigidity, worn parts), expect performance or maintenance costs to be impacted.

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What to Inspect / Test: Key Areas for the T21iFLa

Here are critical subsystems and test ideas to uncover hidden issues. Try to test under load or representative conditions if possible.

Area	What to Inspect / Test	What Can Go Wrong & What to Look For
Spindle & Bearings	• Run spindle at multiple speeds (low, mid, higher). Listen for noise, vibration. • Measure spindle nose or taper run-out with dial indicator. • Heat check: after running, does the spindle/ bearing housing get excessively hot? • Inspect spindle taper for fretting, wear, corrosion. • Check whether coolant (if through spindle or high pressure coolant) is leaking into bearings or compromises seals.	Worn bearings produce vibration, poor surface finish, reduced tool life. Run-out degrades machining accuracy. Coolant ingress is a frequent killer of spindle life. Fretted taper or worn surfaces reduce holding accuracy.
Axes / Guideways / Ball Screws	• Jog all axes full travel: look for smooth motion, dead spots, chatter. • Check backlash in each axis, especially X & Z. • Visually inspect way surfaces and ball screws/nuts: scoring, rust, pitting. • Lubrication: are the ways / screw lubrication systems working properly? Any dried up or blocked lubrication points? • Look for play or slop in linear axes, any wear in guide blocks or bearings.	Guide / screw wear reduces precision, repeatability. If left unchecked, wear can require expensive repairs (replacement screws, re-ground ways, etc.). Lack of lubrication accelerates wear fast.
Control System / CNC Electronics & Software	• Power up and check the control (Fanuc 31i-A5 here): display working, buttons, screen clarity. • Check fault logs / alarm history; see frequent axis errors, drive faults, overcurrent, etc. • Check wiring (servo motors, control box) for signs of heat damage, moisture ingress, corrosion, loose connectors. • Confirm software versions, whether necessary licensed features are present (rigid tapping, 4th axis, etc., if claimed). • Check parameter memory / battery backup for loss or issues.	Obsolete or damaged control boards can be hard or expensive to replace. Missing software features or licenses reduce usefulness. Wiring issues often cause intermittent faults. Loss of parameters means calibration & setup may be compromised.
Tool Changer / Tool Holding	• Operate the ATC / tool changer several cycles: check speed, accuracy, mis-indexing or tool dropouts. • Inspect tool holders, tool pockets for wear or damage. • Check clamping / release mechanisms; check for play. • Check if high pressure coolant delivery behaves properly when tools with coolant through spindle are used.	A failing ATC slows production, may damage tools or spindle. Worn pockets can cause tool run-out or tool drop. Coolant problems during tool changes can lead to contamination or damage.
Thermal Stability & Precision under Load	• Run test parts or sample jobs; measure critical dimensions (flatness, perpendicularity, etc.). • Warm up the machine and measure drift in parts or axes. • Machining of similar material / workloads as what you will use; check if performance holds up through the job (heat effects). • Check accuracy of 4th axis (if equipped) or rotary attachments (if claimed).	Even small thermal drift causes parts to go out of spec. Sometimes machines look good cold but warping, expansion, backlash, alignment issues show after warm-up. Rotary / 4-axis accuracy often weak point.
Physical / Structural Condition	• Inspect column, base, bed for cracks, damage, welding repairs. • Check that protective covers, way covers, chip guards, etc. are intact. • Check for rust, especially in slideways or where coolant/chips accumulate. • Check table flatness, condition of mounting surfaces. • Check chuck or vise alignment if included; check jaw wear or damage.	Physical damage or rust often indicate neglect. Missing protection allows chips & coolant to do damage. Table or workholding defects affect rigidity and accuracy.
Coolant / Chip Handling / Lubrication Systems	• Inspect coolant tank and coolant condition (clarity, presence of sludge, rust, smell). • Check coolant pumps, filters, nozzles; test whether coolant flow is sufficient and coolant through spindle (if applicable) works. • Examine chip conveyor or chip removal: effectiveness, blockages, guards. • Check lubrication: automatic ways lubrication, any grease / oil fittings; whether lubrication is maintained regularly.	Poor coolant can cause overheating, corrosion, affects spindle life and tool life. Blocked chip paths lead to heat buildup and may damage ways or cause crashes. Lubrication neglect is one of the common causes of unexpected wear.
Service / Maintenance History & Parts Availability	• Ask for machine hours: both power-on and hours under load / cutting. Sometimes “hours” are misleading. • Request service / maintenance records: when spindle last serviced, when ball screws or guideways were checked, past major repairs or collisions. • Ask whether spare parts, tooling, and any auxiliary equipment are included or easy to source locally. • Manuals, wiring diagrams, parameter backups, drives / amplifiers spares etc.	A well maintained machine is less risky. If parts are hard to get, or electronics are obsolete, downtime and maintenance cost go up. Lack of documentation slows troubleshooting.
Safety / Infrastructure / Installation	• Check emergency stops, door interlocks, probes, guards. • Inspect electrical panel: condition, correct voltage, phases; whether wiring is safe, grounded. • Floor capacity, foundation leveling; access for rigging and installation. • Confirm that power supply (voltage, phases, amperage) at your site matches machine’s requirements. • Environmental conditions: temperature, humidity, dust— whether machine has been kept in acceptable conditions.	Even if mechanics are good, safety or infrastructure oversights can cause delays, extra work, legal or insurance issues. Misinstallation can reduce accuracy, cause wear. Poor environment accelerates deterioration.

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Common Weaknesses / Known Issues with Robodrill / α-T21iFLa

Products & forum sources suggest some recurring problem areas. Knowing these helps you probe more specifically.

• Spindle contamination or bearing issues, especially on BT-30 taper machines, when coolant seals are degraded. Case study for BT-30 spindle failure due to contamination & lubrication issues.
• Issues with control panel / electrical faults: door interlocks, emergency stop switches; sometimes wiring harnesses corroded or connectors loose. Forums mention “door lock alarm”, etc.
• Problems with perpendicularity or alignment for drilling—over time, small geometrical errors creep in, particularly if machine has been bumped or had heavy use.
• Wear on way surfaces / ball screws, especially with insufficient lubrication or chip protection.
• Chips / splash damage if protective covers / shields are not well maintained.
• Tool change reliability if ATC not serviced; default mis-grips, delays, sensor errors.
• Software / firmware version differences: some machines have features (e.g. rigid tapping, 4th axis, probing) that may be optional or not enabled; misrepresentation happens.

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Red Flags / Deal Killers

If you find one or more of these, either negotiate heavily or reconsider:

1. Spindle noise, vibration, heat, or run-out beyond acceptable limits.
2. Ball screws, axes, or ways with visible damage: scoring, pitting, rust, large backlash.
3. ATC mis-indexing, failing tool changes, worn pockets.
4. Electrical or control problems: repeated error codes, faulty displays, dead buttons, door interlocks not working.
5. Coolant leaks, or coolant entering spindle bearings or motor housings.
6. Missing protective shields or way covers, allowing chips/coolant exposure.
7. Lack of maintenance documentation; unclear usage history; unverified “hours.”
8. Claims of optional features (4th-axis, probing, rigid tapping, high speed variants) without proof.
9. The machine cannot make a test cut, or test cut shows serious drift, poor finish, or errors.
10. Sellers refusing warm-up testing or any repeated measurements or proof of accuracy over time.

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What to Budget For / Negotiation Tips

When making your offer or estimating total cost of ownership, include reasonable allowances for:

• Spindle / bearing refurbishing if run-out or noise is present.
• Replacing seals, coolant hoses, protective covers / guards.
• Ball screw or guide way adjustments / refurbishments, possibly regrinding if needed.
• ATC servicing: sensor replacement, pocket repair, gripper wear.
• Electrical parts: display screens, control components, connectors.
• Software / firmware updates or licensing fees for optional features.
• Chip management / coolant system cleaning; filter replacement.
• Foundation / installation cost: rigging, leveling, verifying alignment.
• Safety upgrades or compliance if your local regulations require extra guarding, interlocks.
• Training or calibration plus time for test runs, scrap during set-up.

Also, make your offer conditional on physical inspection plus test cut(s), warm-up, and measurement of tolerances.