Used EDM Machine Buying Guide: Wire EDM vs. Sinker EDM
By Meadoworks | April 2026 | 13 min read
Key Takeaways
- Two distinct types: Wire EDM cuts through-profiles in hardened material; sinker EDM produces blind cavities and complex 3D shapes
- Wire EDM pricing: $15,000 (Fanuc Alpha 0iA) to $200,000+ (Mitsubishi MV2400, Makino U6, AgieCharmilles CUT)
- Sinker EDM pricing: $8,000 (basic ram) to $150,000+ (linear-motor Makino EDAF, Sodick AG-L)
- Critical inspection: Auto-threading reliability (wire) and generator condition are the most expensive failure modes
- Materials: Cuts any electrically conductive material regardless of hardness — tool steels, carbide, Inconel, PCD
Electrical Discharge Machining (EDM) is one of the most specialized and valuable capabilities a precision shop can add. EDM cuts any conductive material regardless of hardness — making it indispensable for tool and die work, mold manufacturing, aerospace components, and medical devices. Whether you need a wire EDM for precision profiles or a sinker EDM for complex cavities, this guide covers everything you need to know about buying used EDM equipment.
Wire EDM vs. Sinker EDM
EDM machines fall into two fundamentally different categories. Most die/mold shops eventually need both, but many start with one type and add the other as demand grows.
Wire EDM (Wire-Cut)
Uses a thin traveling wire electrode (0.004–0.012") to cut through the workpiece like a bandsaw — but with electrical discharges instead of teeth. Tolerances of ±0.0001" achievable with finishes as fine as 4-8 Ra microinches.
Best for: Stamping dies, extrusion dies, mold inserts, precision gears, fir-tree turbine slots, carbide tooling.
Sinker EDM (Ram / Die-Sinker)
Plunges a preshaped graphite or copper electrode into the workpiece — the electrode shape is reproduced as a cavity through electrical erosion. Works in dielectric oil bath. C-axis machines can rotate the electrode during burn.
Best for: Injection mold cavities and cores, die-cast die cavities, forging dies, blind keyways, internal splines, micro-holes.
Key Wire EDM Specifications
Travel & Workpiece Capacity
X/Y typically 12×10" to 24×16". Z-travel 8-16" for max workpiece thickness. Check max workpiece weight on the table.
Wire Diameter & AWT
Standard 0.010" brass; smaller (0.004"-0.008") for tight corners. Reliable Auto Wire Threading is essential for unattended operation.
Taper Cutting Capability
Independently positioned U/V wire guides. Typical ±15° to ±30° at full Z-height. Critical for stamping dies and ruled-surface work.
Generator Technology
Modern generators improve finish, reduce wire consumption, and add anti-electrolysis circuits to protect carbide and PCD.
Submerged vs. Flushing-Only Cutting
Submerged wire EDMs cut with the workpiece fully immersed in deionized water — superior flushing, better thermal stability, more consistent cutting, and reliable thick-section cuts. Non-submerged machines use only localized flushing nozzles. Most production-quality wire EDMs from the past 20 years are submerged-cutting machines; older non-submerged machines should be priced accordingly.
Key Sinker EDM Specifications
Travel & Work Tank
Typical 12×8×10" to 20×14×14" travel. Tank must accommodate workpiece plus dielectric fluid. Check max workpiece weight.
Electrode Materials & C-Axis
Graphite for low wear and good finish; copper/copper-tungsten for fine work. C-axis enables cylindrical/helical features and improves flushing.
Automatic Tool Changer
Carousel or linear magazine for multiple electrodes. Enables roughing-then-finishing automation and unattended overnight runs.
Linear Motor Drives
Premium machines (Makino EDAF, Sodick AG-L) eliminate backlash, provide faster servo response, and improve surface finish.
Top EDM Machine Brands
Mitsubishi
Models: MV1200, MV2400 (wire); EA, SG (sinker)
Dominant force in wire EDM, particularly in North America. Workhorses known for reliability, cut speed, and reasonable operating costs. Tubular Shaft Motor technology in newer models. Widely available used and well-supported.
Makino
Models: U3, U6, UPJ-2 (wire); EDNC, EDAF (sinker)
Premium EDM machines known for precision and surface finish quality. Wire EDMs achieve 2-3 Ra microinches; EDAF sinker line with linear motors produces exceptional cavity finishes. Industry benchmarks.
Sodick
Models: AQ, ALC, VL (wire); AG, AG-L (sinker)
Pioneered linear motor drives in EDM — even mid-range machines benefit. Known for accuracy, longevity, and low electrode wear. Excellent value: linear motor tech at lower prices than Makino.
AgieCharmilles
Models: CUT (wire); FORM (sinker)
Swiss-built machines renowned for precision and surface finish. Popular in European tool & die shops. Intelligent Power Generator (IPG) technology. Parts and service can cost more in North America than Japanese brands.
Fanuc
Models: Robocut Alpha 0iA/B/C/D/E
Reliability with familiar Fanuc CNC controls. No-frills wire EDM platform — not the fastest, but dependable workhorses. Among the most affordable used wire EDMs. Excellent parts and service support.
Used EDM Machine Pricing Summary
| Machine Type | Examples | Used Price Range |
|---|---|---|
| Entry-level wire EDM | Fanuc Alpha 0iA/0iB, older Sodick AQ | $15,000 – $35,000 |
| Mid-range wire EDM | Mitsubishi MV1200, Sodick ALC, Fanuc 0iC/0iD | $30,000 – $80,000 |
| Premium wire EDM | Makino U3/U6, Mitsubishi MV2400, AgieCharmilles CUT | $60,000 – $200,000+ |
| Basic sinker EDM | Manual ram EDMs, older CNC sinkers | $8,000 – $25,000 |
| Mid-range sinker EDM | Makino EDNC, Sodick AG, Mitsubishi EA | $25,000 – $75,000 |
| Premium sinker EDM | Makino EDAF, Sodick AG-L, AgieCharmilles FORM | $60,000 – $150,000+ |
EDM Applications by Industry
Die & Mold
The backbone of die/mold making. Wire EDM cuts punches, die buttons, strippers, and inserts from hardened tool steel. Sinker EDM produces mold cavities and cores with thin ribs and intricate detail. Machining 60+ HRC steel directly is EDM's fundamental advantage.
Aerospace
Turbine disc fir-tree root slots (wire EDM), turbine blade cooling holes (small-hole EDM), and complex features in titanium and Inconel that resist conventional machining. Cuts superalloys without thermal damage or residual stress.
Medical Devices
Wire EDM for precision components in surgical instruments, implants, and diagnostic equipment. Cuts titanium, cobalt-chrome, and stainless steel with micron precision. Micro-EDM produces sub-millimeter features.
What to Inspect on a Used EDM Machine
Wire Guide Condition (Wire)
Diamond wire guides should be inspected for groove wear. Worn guides allow the wire to wander, producing inaccurate cuts and poor finish. Replacement: $500-$2,000 per set.
Auto-Threading Reliability (Wire)
Test AWT repeatedly at thin, medium, and thick stock. Threading through a submerged start hole is hardest. Some machines thread in air but fail in water. AWT problems can range from cleaning to expensive overhauls.
Power Supply / Generator
Most expensive single component. Run test cuts at multiple settings and compare to spec. Inconsistent sparking or excessive wire breaks indicate generator issues. Repairs: $10,000-$50,000+.
Flushing System
Check wire EDM upper/lower nozzles, deionized water resin, conductivity sensor, chiller. Sinker EDM: dielectric condition, filtration, pump pressure. Bad flushing = unstable cutting.
Accuracy Tests
Cut a precision square or circle on wire EDM and measure profile accuracy across full thickness. Burn a test cavity on sinker EDM and verify gap consistency against electrode dimensions.
Table & Axis Condition
Inspect for damage, pitting, corrosion. Check ball-screw backlash (linear motor machines have zero). Verify all axes move smoothly without sticking, chattering, or noise.
Operating Cost Considerations
EDM machines have ongoing consumable costs that should factor into your purchasing decision:
- Brass wire (wire EDM): $5-$8/lb; busy machine consumes 15-30 lbs/day. Coated wires $8-$15+/lb cut faster.
- Deionized water resin (wire): $200-$500 per replacement; varies with usage and water quality.
- Dielectric fluid (sinker): hydrocarbon oil maintained, filtered, periodically replaced. Cost varies by tank size.
- Filters: $50-$200 per filter set on regular replacement schedule.
- Wire guides and contacts: $1,000-$3,000 annually for wear parts on a production machine.
- Graphite electrodes (sinker): material plus electrode-machining time can be a major operations cost.
Frequently Asked Questions
What is the difference between wire EDM and sinker EDM?
Wire EDM uses a thin, continuously traveling wire electrode (typically 0.004–0.012 inch brass or coated wire) to cut through the workpiece like a bandsaw, but with electrical discharges instead of teeth. It excels at cutting profiles, contours, and through-features in hardened materials with extreme precision. Sinker EDM (also called ram EDM or die-sinker EDM) plunges a shaped graphite or copper electrode into the workpiece, eroding a cavity that mirrors the electrode shape. Sinker EDM is used for blind cavities, ribs, complex 3D shapes, and features that wire EDM cannot access because the wire must pass completely through the workpiece.
How much does a used wire EDM machine cost?
Used wire EDM prices range from $15,000 to $200,000+ depending on brand, age, travel size, and features. Entry-level or older machines (Fanuc Alpha 0iA/0iB, Sodick AQ325/AQ535) start around $15,000–$40,000. Mid-range production machines (Mitsubishi MV1200, Makino U3, Sodick ALC) run $40,000–$100,000. High-end large-travel or late-model machines (Mitsubishi MV2400, Makino U6, AgieCharmilles CUT series) range from $80,000–$200,000+. Submerged-cutting capability, auto-threading reliability, and taper-cutting accuracy heavily influence pricing.
How much does a used sinker EDM machine cost?
Used sinker EDM prices range from $8,000 to $150,000+. Manual or CNC ram EDMs with basic capabilities start around $8,000–$25,000. Mid-range CNC sinker EDMs (Makino EDNC, Sodick AG series, Mitsubishi EA series) run $25,000–$75,000. High-performance sinker EDMs with linear motor drives and advanced generators (Makino EDAF, Sodick AG60L, Mitsubishi SG series) range from $60,000–$150,000+. Machine condition, generator technology, and C-axis (rotary) capability affect pricing significantly.
What materials can EDM machines cut?
EDM machines can cut any electrically conductive material regardless of hardness — this is their primary advantage over conventional machining. Common EDM materials include tool steels (D2, A2, S7, H13, M2) in the hardened state (60+ HRC), tungsten carbide, titanium alloys, Inconel and other nickel-based superalloys, copper alloys, aluminum, and conductive ceramics like PCD (polycrystalline diamond). EDM cannot cut non-conductive materials such as plastics, glass, or standard ceramics.
Browse Used EDM Machines at Meadoworks
Meadoworks stocks used wire EDM and sinker EDM machines from Mitsubishi, Makino, Sodick, AgieCharmilles, Fanuc, and other leading builders. Need help choosing the right machine for your application?
