Does Iron Machine Tool service sinker EDM machines after purchase?

Yes. Iron Machine Tool has service and support technicians based in Minnesota, Missouri, Illinois, and Wisconsin. As an authorized distributor of Mitsubishi Electric EDM equipment through MC Machinery Systems, Iron Machine Tool provides installation support, operator training, and ongoing service for all sinker EDM models.

Mitsubishi Sinker EDM Machines | Authorized Distributor

Q: What is sinker EDM used for?

Sinker EDM is used to machine blind cavities, complex 3D geometries, and tight-tolerance features in hardened conductive materials. Common applications include injection mold cavities, progressive die features, deep slots with sharp internal corners, and fine-finish surfaces on hardened tool steel — primarily in tool & die, mold making, aerospace, and medical device manufacturing.

Q: What is the difference between sinker EDM and wire EDM?

Wire EDM cuts through-profiles using a moving brass wire electrode — ideal for 2D contours and through-slots. Sinker EDM uses a shaped electrode to plunge into the material and create blind cavities and 3D features. The two processes are complementary: wire EDM cannot create blind pockets; sinker EDM cannot cut open profiles efficiently.

Q: Which Mitsubishi sinker EDM machine is right for my shop?

The SG8 and SG12 are strong entry-level options for smaller parts. The SV12P is the choice when surface finish and tolerance repeatability are critical. The SV28 and Gantry Eagle series are built for larger workpieces and higher-throughput production. Contact Steve Brown at Iron Machine Tool for a no-pressure application review.

Q: What is the price of a Mitsubishi sinker EDM machine?

Mitsubishi sinker EDM machines vary in price based on model, table size, and configuration. Entry-level SG series machines start at a lower investment than the high-performance SV series or large-format Gantry Eagle machines. Contact Steve Brown at Iron Machine Tool for factory-authorized pricing based on your specific model and application.

What Is Sinker EDM And When Does It Outperform Other Processes?

Sinker EDM (also called Ram EDM or Die-Sinking EDM) uses a shaped graphite or copper electrode to erode material through electrical discharge. Unlike wire EDM which cuts through-profiles sinker EDM creates blind cavities, complex 3D geometries, and features that no other process can reach in hardened material.

For manufacturers in tool & die, mold making, aerospace, and medical device production across Minnesota and the Midwest, sinker EDM is often the only viable process for:

Injection mold cavities and cores in hardened tool steel
Progressive die features below the surface
Deep, narrow slots with sharp internal corners
Fine surface finishes on hardened workpieces without heat distortion

Iron Machine Tool distributes the Mitsubishi Electric sinker EDM line through MC Machinery Systems — covering everything from the compact SG8 for smaller precision work to the Gantry Eagle 2000 for large-scale industrial molds. Steve Brown has 15+ years of experience matching manufacturers to the right sinker EDM configuration for their application and budget.

How Sinker EDM Works

Sinker EDM works by lowering a pre-shaped electrode typically machined from graphite or copper toward the workpiece. Neither the electrode nor the workpiece touch. Instead, a controlled electrical discharge (spark) jumps the gap between them in a dielectric fluid bath, eroding material from the workpiece surface with each pulse.

The electrode gradually sinks into the workpiece replicating its shape as a mirror cavity in the material. The dielectric fluid flushes away eroded particles and controls the spark gap throughout the process.

Because there is no physical contact between tool and workpiece, sinker EDM produces zero cutting forces. That means no deflection, no stress, and no heat distortion even on the hardest tool steels and exotic alloys.

Key process capabilities:

Surface finishes down to Ra 0.1 µm in finishing passes
Dimensional accuracy to ±0.0001" on well-maintained machines
Works on any electrically conductive material regardless of hardness
No burrs, no tool pressure, no risk of workpiece distortion

Sinker EDM vs. Wire EDM : Which Process Do You Need?

Both processes use electrical discharge to erode conductive material but they solve different problems. Choosing the wrong one for your application costs time and money.

Choose Sinker EDM when:

You need blind cavities or pockets that don't exit the workpiece
Your part requires a complex 3D cavity shape such as mold cores or die impressions
Surface finish is critical mirror finishes are achievable
You're working in hardened material where heat distortion is a risk

Choose Wire EDM when:

You need a through-cut that exits the workpiece completely
Your geometry is a 2D contour, punch profile, or intricate through-shape
You need to cut thin or delicate parts where electrode pressure would cause deflection
You're producing tight-tolerance blanks, templates, or extrusion dies

Many shops run both. Tool & die shops often use wire EDM for punch profiles and sinker EDM for die cavities on the same part family. Iron Machine Tool distributes both product lines and Steve Brown can advise on the right combination for your shop layout and application mix.

SG8 Sinker EDM

Max Workpiece Dimensions (W x D x H):
30.3” x 19.3” x 7.9”
Machine Travels (X x Y x Z):
11.8” x 9.8” x 9.8”

SG8 Sinker EDM

Iron Machine Tool's entry-level sinker EDM for smaller precision parts. The SG8 combines Mitsubishi's AI-powered spark control with an intuitive onboard programming interface making it the most accessible sinker EDM in the line for shops adding in-house EDM capability for the first time.

Best for: Tool rooms, prototype shops, and small die makers running smaller workpieces who want in-house sinker EDM without the overhead of a larger machine.

Max Workpiece Dimensions (W x D x H): 30.3" x 19.3" x 7.9"
Machine Travels (X x Y x Z): 11.8" x 9.8" x 9.8"

Max Workpiece Dimensions (W x D x H):
35.4” x 25.5” x 13.8”
Machine Travels (X x Y x Z):
15.7” x 11.8” x 11.8”

SG12 Sinker EDM

The SG12 scales the SG8's AI spark control and onboard programming to a medium-format work envelope — the most versatile entry point in the SG series for shops running a mix of small-to-medium mold and die work.

Best for: Job shops and tool & die operations transitioning from outsourced EDM to in-house production, or shops needing a reliable second sinker EDM for medium-sized workpieces.

Max Workpiece Dimensions (W x D x H): 35.4" x 25.5" x 13.8"
Machine Travels (X x Y x Z): 15.7" x 11.8" x 11.8"

Max Workpiece Dimensions (W x D x H):
35.4” x 25.5” x 13.8”
Machine Travels (X x Y x Z):
15.7” x 11.8” x 11.8”

SV12P Sinker EDM

High-performance sinker EDM delivering mirror-finish surfaces and ultra-tight tolerances on hardened tool steel — same footprint as the SG12, significantly more capable power supply.

Best for: Precision mold makers, medical device manufacturers, and aerospace tooling shops requiring mirror-finish surfaces and sub-micron dimensional consistency on medium-sized workpieces.

Max Workpiece Dimensions (W x D x H): 35.4" x 25.5" x 13.8"
Machine Travels (X x Y x Z): 15.7" x 11.8" x 11.8"

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SV28 Sinker EDM

Max Workpiece Dimensions (W x D x H):
41.3” x 17.7” x 15.7”
Machine Travels (X x Y x Z):
25.6” x 17.7” x 15.7”

SV28 Sinker EDM

The SV28 extends the SV series to a heavy-duty large-format configuration built for die blocks, large mold bases, and industrial workpieces that exceed the SV12P's table capacity.

Best for: Large stamping die manufacturers, heavy mold makers, and production shops running oversized workpieces that require SV-series surface finish performance at a larger work envelope.

Max Workpiece Dimensions (W x D x H): 41.3" x 17.7" x 15.7"
Machine Travels (X x Y x Z): 25.6" x 17.7" x 15.7"

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Gantry Eagle 800

Max Workpiece Dimensions (W x D x H):
31.5” x 43.3” x 15.7”
Machine Travels (X x Y x Z):
21.6” x 33.5” x 17.7”

Gantry Eagle 800

The Gantry Eagle 800 is the entry point into OPS-Ingersoll's gantry-style sinker EDM line designed for large mold bases and die blocks that require a fixed-table, overhead-ram configuration for maximum workpiece stability.

Best for: Large mold and die shops stepping up to gantry-style EDM for the first time, or production environments running medium-to-large workpieces where electrode wear cost and cycle time are key buying criteria.

Max Workpiece Dimensions (W x D x H): 31.5" x 43.3" x 15.7"
Machine Travels (X x Y x Z): 21.6" x 33.5" x 17.7"

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Gantry Eagle 1200

Max Workpiece Dimensions (W x D x H):
49.2” x 68.9” x 23.6”
Machine Travels (X x Y x Z):
39.4” x 49.2” x 23.6”

Gantry Eagle 1200

The Gantry Eagle 1200 delivers ultra-high precision on large workpieces including 0.0008" fine wire capability for tight-tolerance cavity work on oversized mold bases. A step up in accuracy and finishing performance is the primary requirement.

Best for: Large-format precision mold makers and aerospace tooling manufacturers running oversized workpieces where dimensional accuracy and surface finish quality are the primary performance criteria.

Max Workpiece Dimensions (W x D x H): 49.2" x 68.9" x 23.6"
Machine Travels (X x Y x Z): 39.4" x 49.2" x 23.6"

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Gantry Eagle 1400

Max Workpiece Dimensions (W x D x H):
59.4” x 101.9” x 31.1”
Machine Travels (X x Y x Z):
49.2” x 92.5” x 27.5”

Gantry Eagle 1400

The Gantry Eagle 1400 is built for high-volume large mold production optimized for the lowest graphite electrode wear rates and fastest cycle times in the Gantry Eagle series. Where the Eagle 1200 prioritizes precision and ROI per machine hour without sacrificing accuracy on large workpieces.

Best for: High-volume large mold production shops and industrial die manufacturers where cycle time, electrode consumption cost, and machine ROI drive the buying decision.

Max Workpiece Dimensions (W x D x H): 59.4" x 101.9" x 31.1"
Machine Travels (X x Y x Z): 49.2" x 92.5" x 27.5"

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Gantry Eagle 2000

Max Workpiece Dimensions (W x D x H):
79.5” x 126.7” x 49.2”
Machine Travels (X x Y x Z):
68.9” x 116.1” x 35.4”

Gantry Eagle 2000

The largest sinker EDM in the OPS-Ingersoll line. Handles massive injection mold bases, large die sets, and heavy aerospace tooling no C-frame machine can accommodate.

Best for: Heavy industry manufacturers, large-scale aerospace and energy tooling shops, and mold makers running the largest workpieces in the market where machine capacity and uptime reliability are the deciding factors.

Max Workpiece Dimensions (W x D x H): 79.5" x 126.7" x 49.2"
Machine Travels (X x Y x Z): 68.9" x 116.1" x 35.4"

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Q1: What is sinker EDM used for?

Q2: What is the difference between sinker EDM and wire EDM?

Q3: Which Mitsubishi sinker EDM machine is right for my shop?

Q5: What is the price of a Mitsubishi sinker EDM machine?

Q: Is the MV4800-S available through Iron Machine Tool in the Midwest and what does the buying process look like?

Wire EDM

EDM Automation

Sinker EDM

EDM Hole Drilling

Precision Milling

Mitsubishi Sinker EDM Machines Authorized Distributor Serving Minnesota & the Midwest