Here’s a detailed, structured guide for evaluating a pre-owned / used / surplus Hardinge Conquest CS-GT (or CS-GT / GT-series) CNC Lathe — from factory floor to your workshop. Use this as a checklist and decision tool to reduce risk and ensure you get a machine that will meet your needs.

---

A. Baseline & “What Should Be” — Know the Reference

Before inspection, you should gather or confirm the nominal specifications (as-built or as-sold) of the Hardinge Conquest CS-GT model (or the specific variant you are considering). This gives you reference tolerances to compare against.

From public listings, the CS-GT / GT series specs include:

Parameter	Typical / Published Value*
Swing over bed / way cover	~ 11.76 in (~ 298.7 mm)
X-axis travel	~ 11.968 in (~ 303.78 mm)
Z-axis travel	~ 10.42 in (~ 264.67 mm)
Rapid traverse	X: ~472 ipm, Z: ~630 ipm
Spindle power	~ 5 HP (~3.7 kW)
Max spindle speed	~ 5,000 rpm (some listings suggest up to 6,000 rpm)
Bar capacity (through spindle)	~ 1.062 in (~ 26.975 mm)
Chuck size	6 in (152.4 mm) in many listings
Weight & footprint	~ 5,700 lbs (≈ 2,585 kg), dimensions ~ 72″ × 60″ × 72″

* These are typical values; variants or modifications may differ.

Knowing what the machine was designed for helps you see how far it may have degraded, or whether you’re getting a downgraded or modified model.

---

B. Inspection & Evaluation Checklist

When you visit the machine (or review detailed videos/photos), use the following detailed checklist tailored to CNC lathes and the specifics of the CS-GT / gang tool lathe type.

Focus Area	What to Inspect / Test	Why It’s Important / Risk Indicators
Visual / Structural Condition	Examine the bed, saddle, column, way covers, guards. Look for cracks, welds, corrosion, repairs, misalignment.	Structural damage or poor repair work compromises rigidity and precision.
	Check for missing panels, covers, access doors, guards.	Missing parts suggest neglect or that parts were scavenged.
	Inspect for oil leaks, coolant staining, rust, residue buildup.	Leaks indicate seal or plumbing failures; corrosion may damage precision surfaces.
Control / CNC / Electronics	Power up the CNC — check boot sequence, alarms, error logs.	A bad or corrupt control can render the machine unusable.
	Verify the control panel, buttons, display, pendant operation.	Faulty or unresponsive controls are serious trouble.
	Jog axes in manual mode (X, Z). Check responsiveness, smoothness, no stalling.	Sluggish or erratic axis motion signals servo or mechanical issues.
	Review the software version, upgrade history, parameter backups, memory battery status.	Obsolete or unbacked software is a risk; lost parameters can cripple the machine.
Spindle & Headstock	Run spindle at various speeds, listen for abnormal noise or vibration.	Bearing or internal damage often reveals itself under motion.
	Test radial run-out with a test bar or dial indicator.	Excessive run-out means the spindle is worn or damaged.
	Check spindle taper / interface for wear, nicks, or deformation.	A degraded taper affects tool holding accuracy.
	Ask for spindle replacement / rebuild history.	A spindle rebuild reduces risk and extends usable life.
Ways, Slides, Ball Screws / Guideways	Move the saddle and cross-slide full travel; check for binding, rough spots, inconsistent motion.	Smoothness across full stroke is key to usable performance.
	Measure backlash in the X and Z axes.	Excessive backlash reduces precision and repeatability.
	Examine wear on guideway surfaces: scratches, pitting, scoring.	Surface damage may require regrinding or replacement of slides.
	Check the automatic lubrication / oiling system, levels, flow, lines.	Poor lubrication accelerates wear.
Tooling / Gang / Tool Post / Turret (if present)	For a gang tool lathe, inspect the gang tooling bar: alignment, rigidity, wear.	Misalignment in the gang tooling severely degrades tool accuracy.
	Inspect tool holders, slides, carriage mechanism.	Worn tooling interfaces reduce precision.
Coolant, Chip Removal, Ancillaries	Test coolant pump, flow, filters, and cleanliness of coolant.	Dirty, contaminated coolant damages parts and slides.
	Check chip conveyor or system, augers, scrap removal.	Blocked or nonfunctional chip systems cause clogging and damage.
	Inspect electrical cabinets, wiring, ventilation, fans.	Poor electronics environment shortens component life.
Metrology / Test Part Run	Run a test turning operation: measure diameter, roundness, surface finish.	The real test: can this machine meet your tolerances.
	Check positional repeatability: command same move multiple times, measure return error.	Good CNC machines maintain tight repeatability.
	Thermal stability: let it run for some time; measure whether drift occurs.	Lathe accuracy depends on stable thermal behavior.
Documentation & Maintenance History	Ask for all maintenance logs, repair records, rebuild history, parts replaced.	A well-documented machine is less of a risk.
	Request mechanical / electrical drawings, wiring diagrams, manuals, parts lists.	These are essential for future servicing and repairs.
	Ask about any modifications or retrofits (non-standard changes).	Un-documented mods may complicate repairs or spare compatibility.
Foundation, Installation, Environment	Check how the machine was mounted: leveling, anchoring, base condition.	A poor foundation causes misalignment and vibrations.
	Review the environment: cleanliness, temperature control, dust, humidity.	Harsh environments accelerate wear.
	Determine logistical challenges: weight, footprint, transport, power requirements.	You must budget for moving, setup, alignment, power hookup.

---

C. Red Flags / Warning Signs

When evaluating, watch for the following red flags — any one of them can seriously degrade the value or usability of the machine:

• Spindle with significant vibration, noise or excessive heating under load
• Run-out beyond acceptable microns on test bars
• Excessive backlash or play in X / Z axes
• Binding or rough motion in slides or carriage
• Scored, pitted, or visibly worn way surfaces or slides
• Control system boot failures, corrupted parameters, or nonfunctional controls
• Missing or damaged wiring, controls, or connectors
• Leaking coolant / oil systems, rust or corrosion inside tanks or slides
• Nonfunctional or clogged coolant/chip removal systems
• Tooling / gang bar misalignment or excessive wear
• Unknown or undocumented modifications
• No maintenance records or service history
• Electrical cabinets with burnt components, poor ventilation, evidence of abuse
• Cases where seller refuses to run test parts or show operation

---

D. Estimating Remaining Life & Purchase Strategy

After doing the inspection, you must form an opinion: Is the machine worth buying, and at what price? Below is how to approach this.

1. Review how far it has degraded from nominal specs
   – Compare measured run-out, backlash, motion smoothness against what is acceptable for your work
   – If deviations are small and within your tolerances (or compensatable), that’s positive
2. Identify necessary refurbishments / repairs
   – Regrinding or re-lapping slides, repairing or replacing bearings, refurbishing spindle, updating control, cleaning coolant systems, etc.
   – Get quotes (or rough estimates) for those repairs
3. Assess spare parts availability / risk
   – How easy or hard is it to source parts (bearings, control boards, spindle, guides) for this model?
   – If parts are scarce or obsolete, factor that into your risk and price negotiation
4. Compare market comps
   – Look up recent sale / listing prices for CS-GT / GT lathes in similar condition
   – Adjust for your region, included accessories, refurbishment needs
5. Calculate “all-in” cost
   – Add transport, rigging, installation, foundation, calibration, tooling, and setup time costs
   – Add budget for post-delivery tune-up, adjustments, alignment
6. Negotiate with margin for surprises
   – Always allow a discount (buffer) to absorb hidden issues discovered later
   – If possible, include a conditional clause (e.g. “if measurements after install exceed X, we revise price or seller repairs”)
7. Decide whether the machine can meet your required tolerances & throughput
   – If, after refurbishment, it can reliably hit your required precision and production rate, then it’s a valid investment