Buying a magnet cutting machine is a decision most shops only make once every 5–10 years. Get it right, and the machine pays for itself in reduced scrap, better surface quality, and faster throughput. Get it wrong, and you’re stuck with equipment that doesn’t match your production reality — either too small for your volume or too expensive for your actual needs.
We build エンドレスダイヤモンドワイヤーソー that cut magnets across all three material families — ネオジム鉄B, フェライトそして SmCo. So we’re obviously biased toward wire cutting. But we’ve also talked to hundreds of magnet manufacturers who evaluated multiple cutting technologies before making their decision. This guide is based on the questions they asked and the trade-offs they actually weighed — not just the specs on a brochure.
What Should You Consider Before Choosing a Magnet Cutting Machine?
Before looking at specific machines, answer these five questions. They narrow the field faster than any feature comparison:
1. What material are you cutting?
This is the single biggest filter. NdFeB requires 13. ）を使用した場合の、焼結NdFeBの典型的な切断表面は以下のようになります。 and produces flammable dust. Ferrite is non-conductive, which eliminates EDM entirely. SmCo is expensive enough that kerf loss becomes a major cost driver. Each material has different optimal cutting parameters, but the good news is that diamond wire saws handle all three — you don’t need separate machines for separate materials.
2. What’s your maximum workpiece size?
A 10 × 10 mm lab sample and a 200 × 200 mm production block require very different machines. Check the machine’s maximum cutting capacity (length × width × height) and make sure it covers your largest current workpiece plus some headroom for future needs.
3. What’s your production volume?
A research lab cutting 5–10 samples per week has completely different requirements from a motor magnet factory cutting 500+ pieces per day. Low volume favors flexibility and easy setup. High volume favors automation, batch processing, and multi-wire capability.
4. What thickness tolerance do you need?
If ±0.05 mm is acceptable, a well-set-up single-wire machine handles it directly. If you need ±0.01 mm, you’ll likely need a grinding step after cutting regardless of the cutting technology — in which case, the cutter’s job is to get you close with minimal subsurface damage, and the grinder does the final sizing.
5. What’s your budget — including consumables?
Machine purchase price is the obvious cost, but consumable cost per cut (wire, coolant, electricity) and maintenance cost over 5 years often determine the real economics. A cheaper machine with expensive consumables or frequent downtime can cost more than a premium machine over its service life.
How Do Different Magnet Cutting Machine Types Compare?
エンドレス ダイヤモンド ワイヤーソー
This is the technology we specialize in. A short closed-loop ダイヤモンドワイヤー (typically 1–5 meters) runs continuously in one direction around guide wheels. The workpiece feeds into the wire at a controlled rate.
Strengths:
- Thin kerf (0.35–0.50 mm wire diameter) minimizes material waste — critical for expensive SmCo and high-grade NdFeB
- Low cutting force reduces chipping and subsurface damage on all brittle magnet materials
- Unidirectional wire motion produces no reversal marks — surface roughness Ra 0.3–0.8 μm depending on material
- Same machine handles NdFeB, ferrite, and SmCo with parameter changes only
- Compact footprint — desktop models fit in a lab, production models in a standard workshop bay
制限事項:
- Single-wire machines cut one slice at a time — not competitive with multi-wire for high-volume wafer production
- Cutting speed is moderate (1–3 mm/min feed rate for magnets) — slower than aggressive grinding
- Cannot do complex 3D profiles without a contour-cutting model
- Wire is a consumable — replacement every 4–7 days at 8 hours/day operation
最高だ： R&D labs, small-to-medium production, mixed-material shops, applications where surface quality and kerf loss matter.
マルチワイヤーソー
A マルチワイヤーソー uses a long wire (1000+ meters) wound between rollers at a fixed pitch, creating dozens to hundreds of parallel wire segments. One pass through the workpiece produces 50–200+ slices simultaneously.
Strengths:
- Massive throughput for identical slices — one cut cycle replaces 50–200 single-wire cuts
- Excellent thickness uniformity across the batch when properly set up
- Low per-piece cutting cost at high volume
制限事項:
- All slices must be the same thickness — no mixed-thickness production without rethreading
- Equipment cost is significantly higher (5–10× a single-wire machine)
- Complex setup, calibration, and maintenance — requires skilled operators
- Wire management is complex — 1000+ meters of wire, reciprocating motion, splice management
- Kerf is typically wider than single-wire (wire diameter + reciprocation wear)
最高だ： High-volume magnet wafer production (motor magnets, sensor blanks) where thousands of identical slices per day justifies the equipment investment.
ID (Inner-Diameter) Blade Saw
An annular blade with diamond abrasive on the inner edge. The workpiece feeds through the blade center. This was the standard before wire cutting became common.
Strengths:
- Mature technology — well understood, widely available, easy to source parts
- Reasonable cutting speed for small-to-medium cross-sections
- Lower equipment cost than wire saws for basic models
制限事項:
- Thicker kerf (0.3–0.5 mm blade, creating 0.4–0.6 mm kerf) wastes more material
- Higher lateral cutting force causes more edge chipping than wire cutting
- Blade rigidity limits minimum workpiece thickness — thin slices (< 2 mm) have high reject rates
- Limited to straight cuts
最高だ： Shops with existing blade cutting experience cutting medium-sized NdFeB blocks where kerf loss isn’t the primary concern.
EDMワイヤーカット
Electrical discharge machining uses electrical sparks to erode conductive material. A thin brass or copper wire (0.1–0.3 mm) acts as the electrode. The process is well-documented in manufacturing engineering literature and widely used for complex geometries.
Strengths:
- Excellent geometric flexibility — complex 2D profiles, arcs, slots, and custom shapes
- Very thin kerf (0.1–0.35 mm)
- No mechanical cutting force — zero chipping risk
制限事項:
- Only works on conductive materials — cannot cut ferrite at all
- Creates a heat-affected zone and recast layer that damages the magnetic microstructure
- Slow for straight cuts compared to diamond wire
- Higher operating cost (wire, dielectric fluid, power)
- Surface finish includes carbonization that interferes with downstream plating
最高だ： Complex-profile NdFeB or SmCo parts where geometric flexibility outweighs the thermal damage concern. Not suitable for ferrite or for applications where magnetic property preservation is critical.
Which Magnet Cutting Machine for Which Scenario?
Here’s the decision matrix we walk customers through:
| Your Situation | Recommended Machine | なぜ |
|---|---|---|
| R&D lab, 5–20 samples/week, mixed materials | Single-wire saw (SG20) | Flexibility, low cost, handles all materials |
| Production, 50–200 parts/day, straight cuts | Single-wire saw with rotation (SG20-R) | Good throughput, versatile, handles blocks up to 200mm |
| Production, 500+ identical wafers/day | Multi-wire saw | Volume economics justify equipment cost |
| Complex profiles (arcs, slots) in NdFeB/SmCo | Contour cutting machine (SGI20) or EDM | Geometric flexibility needed |
| Ferrite only, any volume | Single-wire or multi-wire saw | EDM is eliminated; wire saw is the default |
| Mixed NdFeB + ferrite production | Single-wire saw with coolant changeover | One machine, two coolant setups |
What Does a Magnet Cutting Machine Actually Cost?
We get asked this constantly, and the honest answer is: the machine price is only part of the picture.
設備費
Equipment pricing varies significantly by machine type, capacity, and automation level. Single-wire endless diamond wire saws are the most accessible entry point. Multi-wire saws cost substantially more (typically 5–10× a single-wire machine) due to their complexity and throughput capability. EDM machines fall somewhere in between.
Rather than publishing list prices that don’t account for your specific configuration needs, we recommend contacting us directly for a quote based on your material, workpiece size, and production volume. We’ll spec the right machine and provide a complete cost breakdown including installation, training, and coolant system.
Consumable Cost Per Cut
This is where the real economics play out over time:
| Consumable | エンドレスワイヤーソー | マルチワイヤーソー | ID Blade | EDM |
|---|---|---|---|---|
| Cutting tool cost | Low (wire loop, lasts 4–7 days) | High (long wire spool, lasts 1–2 weeks) | Medium (blade, lasts 1–4 weeks) | Medium (wire spool, continuous feed) |
| Coolant cost | ロー・ミディアム | Similar | Similar | High (dielectric fluid) |
| Power consumption | Low (< 1 kW motor) | ミディアム | ミディアム | 高い |
| メンテナンス | Minimal — guide wheels, occasional alignment | Moderate — wire management, roller maintenance | Low — blade changes | High — guides, power feeds, filtration |
The endless wire saw has the lowest daily consumable cost of all four technologies — the wire loop is inexpensive and lasts multiple days, power draw is minimal, and maintenance is straightforward.
Total Cost of Ownership: Why Kerf Loss Matters More Than Machine Price
Total cost of ownership analysis is the only fair way to compare equipment. The machine price gets all the attention, but the real difference often comes down to material savings from kerf reduction.
Consider this: an endless wire saw (0.40 mm kerf) versus an ID blade (0.50 mm kerf) cutting NdFeB blocks into 2 mm wafers. That 0.10 mm kerf difference saves approximately 3% of raw material per year. For a shop cutting 50 blocks per day, the annual material savings from reduced kerf often exceeds the price difference between the two machines — especially on high-grade NdFeB or SmCo where raw material is the dominant cost.
The lower the kerf, the more slices per block. The more slices per block, the lower your per-part material cost. Over 3–5 years of production, this single factor typically dominates the total cost comparison. お問い合わせ with your specific material, block size, and production volume — we’ll run a TCO comparison tailored to your operation.
What Features Actually Matter in a Magnet Cutting Machine?
Spec sheets list dozens of features. Here are the ones that actually affect daily cutting quality and productivity, based on what our customers tell us after 6–12 months of operation:
Programmable feed rate with multi-stage profiles. The ability to set different feed rates for entry zone, bulk cut, and exit zone is essential for chipping prevention on brittle magnets. Machines with only single-speed feed control force you to run the entire cut at the conservative exit-zone speed, reducing throughput by 30–50%.
Wire tension adjustment with digital readout. Precise tension control — adjustable in 5–10 N increments — directly affects surface quality and chipping. Machines without digital tension readout leave you guessing, which means inconsistent results.
Coolant containment and filtration. A machine that manages coolant well — splash guards, integrated filtration, drip-free workpiece loading — reduces cleanup time and contamination issues. This sounds minor until you’re wiping oil off every surface twice a day.
Workpiece capacity with margin. Buy a machine that handles workpieces 20–30% larger than your current maximum. In our experience, every customer eventually gets a request for a part bigger than their usual range.
Rotation axis (optional but valuable). の SG20-R adds a rotation function that lets you cut cylindrical magnets and arc segments directly. If your product mix includes both flat and cylindrical parts, this feature eliminates the need for a second machine.
Common Magnet Cutting Machine Buying Mistakes
Buying based on cutting speed alone. The machine that cuts fastest often produces the worst surface quality on brittle magnets. Speed means nothing if 20% of your parts are scrap from chipping.
Ignoring coolant system compatibility. If you’re cutting NdFeB, you need oil-based coolant. Some cheaper machines are designed for water-based coolant only — no oil-compatible seals, no oil filtration, no fire-safe electrical components. Retrofitting for oil is expensive and sometimes impossible.
Undersizing the machine. A machine at its maximum capacity is a machine at its limit. Cutting a 200 mm block on a machine rated for 200 mm means zero margin for setup error, wire deflection, or fixture clearance. Buy 20% more capacity than you think you need.
Skipping test cuts. Every magnet material, grade, and geometry behaves slightly differently during cutting. Buying a machine without first testing your actual material on that machine is an expensive gamble. We offer 無料テストカット for exactly this reason — and any reputable equipment supplier should offer something similar.
Forgetting about consumable availability. A machine is only as good as the wire, blades, or electrodes available for it. Check that replacement consumables are readily available, reasonably priced, and don’t require proprietary specifications that lock you into a single supplier. Our ダイヤモンドワイヤーループ are standard sizes compatible with any endless wire saw.
