Buying a used deep hole drilling machine can save 50–70% of the new price. But the wrong used machine — one with a worn spindle, corroded coolant system, or misaligned guideways — can cost more in repairs than buying new.
This guide covers the inspection process, price benchmarks, brand comparisons, and a decision framework to help you choose between new and used.
1. New vs Used: Price Comparison
Typical Price Ranges (2024–2025)
| Machine Type | New Price | Used Price | Used as % of New |
|---|---|---|---|
| Small gun drilling (10 mm cap.) | $80,000–$150,000 | $20,000–$50,000 | 25–35% |
| Medium gun drilling (25 mm cap.) | $150,000–$250,000 | $40,000–$80,000 | 25–35% |
| BTA machine (60 mm cap.) | $200,000–$400,000 | $50,000–$150,000 | 25–40% |
| Large BTA / multi-spindle | $400,000–$1,000,000+ | $100,000–$250,000 | 20–30% |
Sources: Exapro used listings; Artizono price guide; AGrade Carbide; CNC Exchange.
Depreciation curve: Deep hole drilling machines depreciate faster than standard CNC machines due to the specialized market. A 5-year-old machine typically retains 40–60% of its original value; a 10–15-year-old machine, 20–35%. However, well-maintained machines from top brands (TBT, UNISIG, Mollart) hold value significantly better than generic imports.
For a detailed TCO framework to compare options, see the Total Cost of Ownership Guide.
2. Brand Comparison
The deep hole drilling market is dominated by a few established manufacturers. The top 5 companies account for approximately 45% of global market share (QYResearch, MarketPublishers 2025).
| Brand | Market Position | Typical Used Price Range | Service/Support | Best For |
|---|---|---|---|---|
| TBT (Germany) | Market leader | $20,000–$80,000 | Strong in Europe, limited in North America | High-precision, heavy-duty production |
| UNISIG (USA) | Top global player | $30,000–$150,000 | Strong in North America, global network | Aerospace, defense, oil & gas |
| Mollart (UK) | Top 5 globally | $25,000–$100,000 | Strong in Europe, UK-based | General-purpose, job shop |
| Precihole (India) | Growing global share | $15,000–$60,000 | Regional, cost advantage | Entry-level, price-sensitive buyers |
| Sunnen (USA) | Key player | $20,000–$70,000 | Strong in North America | Small-diameter, honing combo |
| Chinese brands | Price leader | $10,000–$40,000 | Limited outside China | Budget-constrained, simple applications |
Sources: QYResearch; HTF Market Report; Exapro and CNC Exchange listings.
Depreciation by brand: Premium brands (TBT, UNISIG, Mollart) hold 30–50% of new value after 10 years. Economy brands typically fall to 15–25% in the same period.
3. Pre-Purchase Inspection Checklist
3.1 Spindle System
The spindle is the most critical and expensive component. Spindle bearing replacement ranges from $20,000 to $60,000 depending on the machine size (Premier Equipment; Mass CNC Tech).
| Check | Method | Pass Criteria | Red Flag |
|---|---|---|---|
| Radial runout | Dial indicator on test bar at spindle nose | ≤ 0.01 mm | > 0.02 mm indicates bearing wear |
| Axial runout | Dial indicator on spindle face | ≤ 0.01 mm | > 0.02 mm |
| Bearing noise | Run at low/medium/max speed, listen | Smooth, consistent | Grinding, rattling, whining |
| Bearing temperature | IR thermometer after 30 min at max RPM | Rise < 5°C above ambient | Rising temp that doesn’t plateau |
| Coolant in spindle | Inspect seals, look for oil/water mix | Dry, clean seals | Coolant ingress = bearing contamination |
3.2 Coolant System
Deep hole drilling relies on high-pressure coolant. A failing coolant system makes the machine unusable.
| Check | Method | Pass Criteria |
|---|---|---|
| Maximum pressure | Pressure gauge at pump outlet | Reaches rated pressure |
| Pressure stability | Monitor during test cycle | Stable within ±5% |
| Flow rate | Flow meter at tool interface | Meets manufacturer specification |
| Filtration condition | Inspect filter media and tank | Clean media, no sludge buildup |
| Leak integrity | Visual inspection of hoses, fittings, seals | No drips or wet spots |
| Chip evacuation | Inspect return lines and chip conveyor | Clear, no blockages |
See the Coolant Pressure and Flow Rate Guide for specification benchmarks.
3.3 Structural and Mechanical
| Check | Method | Pass Criteria |
|---|---|---|
| Guideway condition | Visual + fingernail test | No scoring, pitting, or ridges |
| Axis backlash | Dial indicator on saddle | X: < 0.008 mm, Z: < 0.012 mm |
| Ball screw condition | Run full travel, listen | Smooth, no binding or noise |
| Hydraulic system | Check pressure stability, leaks | Reaches pressure within 30 sec |
| Machine level | Precision level on bed | Within 0.02 mm/m |
3.4 Control System
| Check | Method | Pass Criteria |
|---|---|---|
| CNC boot-up | Full power cycle | No alarm codes, clean boot |
| Parameter backup | Request from seller | Backup available, not cleared |
| Axis motion | Jog all axes at multiple speeds | Smooth, no vibration |
| Spindle orientation | Test M19 / orientation function | Stops at consistent position |
3.5 Test Cut — Non-Negotiable
Insist on drilling a test hole in material similar to your typical workpieces. Measure:
| Metric | Acceptable Range |
|---|---|
| Hole straightness | Within machine specification or < 0.15 mm/m |
| Entry vs exit diameter | Within IT grade claimed |
| Surface finish | Ra within specification |
| Chip form | Consistent, well-broken chips |
| Cycle time | Within 10% of original specification |
Source: CNC Bul used machine evaluation guide; YJSershisan inspection guides.
4. Refurbishment Cost Benchmarks
If you buy a used machine requiring repairs, budget for these typical costs:
| Repair Item | Typical Cost | Notes |
|---|---|---|
| Spindle bearing replacement | $20,000–$60,000 | Most expensive single repair |
| Ball screw replacement | $8,000–$25,000 | Per axis |
| Coolant pump rebuild | $3,000–$8,000 | High-pressure pump |
| Guideway regrinding | $5,000–$15,000 | Plus turcite reapplication |
| CNC control retrofit | $15,000–$35,000 | Older controls (Fanuc 0/15/16 series) |
| Coolant tank and filtration | $5,000–$15,000 | Replace filters, clean tank |
| Full machine alignment | $3,000–$8,000 | After major repairs |
| Total refurbishment budget | $60,000–$165,000 | For a machine needing major work |
Source: Premier Equipment; World MC; industry estimates.
Rule of thumb: If the purchase price plus refurbishment exceeds 65% of a new machine price, buy new.
5. Decision Framework
Step 1: Evaluate Your Requirements
| Factor | Lean New | Lean Used |
|---|---|---|
| Budget flexibility | Tight, need lowest entry cost | Used wins |
| Required precision | IT7 or better | New preferred (used after refurb) |
| Production uptime critical | Minimal downtime acceptable | New wins (used has risk) |
| Available in-house maintenance | Limited capability | New wins (warranty covers) |
| Experienced maintenance team | Strong | Used can work |
| Machine availability | Need immediately | Used (no lead time) vs New (3–12 mo) |
Step 2: Calculate Total Cost
Take the used machine price, add the refurbishment budget, and compare to new:
[ C_{used, total} = P_{used} + R_{estimated} + D_{downtime} ]
Where R_estimated = estimated refurbishment costs and D_downtime = value of lost production during repairs.
Step 3: Verify Seller Credibility
| Question | Green Flag | Red Flag |
|---|---|---|
| Willing to demonstrate under power? | Yes | No, or makes excuses |
| Maintenance records available? | Complete logs | None, or “lost” |
| Original manuals included? | Yes | No |
| Reason for sale? | Upgrade, moving, closing | “Don’t know” or evasive |
| Test cut allowed? | Yes, with your material | No |
| Independent inspection allowed? | Yes | No |
6. Summary
| If you… | Recommended Approach |
|---|---|
| Have $200k–$500k budget, need production within weeks | Well-inspected used machine from top brand |
| Have budget, need highest precision (IT7+), can wait 6 months | New machine with warranty and support |
| Are a first-time DHD buyer | New (or used with manufacturer refurbishment) |
| Have strong in-house maintenance | Used — refurbish yourself, save 40–60% |
| Are buying from a brand with limited local support | New (warranty offsets service risk) |
| Find a TBT/UNISIG/Mollart with <10,000 spindle hours and clean records | Buy it — these machines run 20+ years |
Key Sources
- Exapro, used deep hole drilling machine listings — pricing data (€20,000–€250,000)
- CNC Exchange and Machinio — used UNISIG and TBT pricing
- QYResearch, “Global Deep Hole Drilling Market Report 2025” — manufacturer market share
- HTF Market Report, “Deep Hole Drilling Competitive Landscape 2025” — brand positioning
- Premier Equipment, “How to Assess Spindle Health in Used CNC Machines” — spindle inspection
- Premier Equipment, “7 Step Guide to Inspecting a Used CNC Machine” — general inspection
- Mass CNC Tech, used CNC inspection guide — runout standards
- World MC, used metalworking machinery inspection checklist — structural inspection
- CNC Bul, “Before You Buy: Essential Criteria for Evaluating a Used Deep Hole Drilling Machine” — DHD-specific inspection
- American Machinist, “Tips for Buying Used CNC Machines” — general guidance
- Artizono, “CNC Deep Hole Boring Machine Price Comparison Guide” — new machine pricing
- AGrade Carbide, “Types of Deep Hole Drilling Machines” — machine classification