Process & Material
Pure Tungsten Micro EDM Feasibility Review
Pure Tungsten can be machined with Micro EDM when the geometry matches micro holes, micro slots, miniature cavities, fine pins, and sub-millimeter precision details. Pure Tungsten is a very high-melting refractory metal with high stiffness and brittle edge behavior at room temperature; the supplied condition affects support, discharge energy, finishing, and inspection.
Quick Answer
Micro EDM is suitable for Pure Tungsten when the feature is a micro hole, micro slot, miniature cavity, fine pin, or other sub-millimeter detail. The supplied condition must be stated before tolerance and surface requirements are confirmed.
Key Material Decisions
How This Material Behaves
A very high-melting refractory metal with high stiffness and brittle edge behavior at room temperature. In Micro EDM, the supplied condition directly changes discharge stability, electrode wear, edge quality, and the finishing plan—especially at micro scale.
Choosing the Right Condition
Choose Micro EDM for micro holes, micro slots, miniature cavities, fine pins, and sub-millimeter precision details. State the exact Pure Tungsten condition, then set tolerance, finish, support, and inspection from the controlled feature rather than the whole part.
Risks to Manage
For Micro EDM, tungsten grain response and electrode wear are comparable with the feature size, making edge integrity and metrology more limiting than bulk hardness. Where a few micrometers of wear or edge damage consume a large share of tolerance, micro-flushing instability can alter both local surface condition and the effective feature boundary, with the highest consequence at grain boundaries, brittle rims and subsurface damage zones. The Pure Tungsten feature may therefore show feature discontinuity, pullout or crack damage at a scale comparable with the microstructure. For Pure Tungsten, use conservative discharge energy, strong local support and microscopic inspection of edges and subsurface damage. Verify size, pitch, edge continuity and surface condition under the same inspection plan; document geometry, chipping, grain pullout and subsurface cracking for Pure Tungsten.
How Micro EDM Works on Pure Tungsten
Micro EDM uses a very small electrode and low discharge energy to machine miniature features in Pure Tungsten. Electrode wear, spark-gap stability, micro-flushing, temperature control and measurement resolution consume a significant share of the available tolerance. The local feature size and aspect ratio—not the overall workpiece size—must define the route.
Micro EDM Capability Reference
| What you're asking | What you can expect |
|---|---|
| Feature types | micro holes, micro slots, miniature cavities, fine pins, and sub-millimeter precision details |
| Tolerance | ±0.002–0.010 mm |
| Surface finish | Ra 0.1–1.6 μm |
| Feature scale | Sub-millimeter holes, slots, and cavities |
| Primary micro limit | Electrode wear and measurement resolution |
| Main limitation | Loose-tolerance or easily accessible features are rarely economical with Micro EDM. |
Material Condition Reference
| Condition | What to expect | Watch out for | Surface notes |
|---|---|---|---|
| as-sintered or supplied condition | Use low-force fixturing and conservative discharge energy. | Brittle edges can chip or binder-rich zones can erode unevenly. | Inspect edge breakout and surface integrity rather than Ra alone. |
| stress-relieved or recrystallized | Use stable support and reduced energy on finished stock. | Grinding stress or porosity can cause local cracking. | Apply selective polishing or lapping where practical. |
How This Material Behaves
Pure tungsten is extremely refractory, stiff, and brittle. In EDM, this means sharp edges and thin sections can chip or microcrack under thermal shock even though no cutting force is applied. Use conservative pulse energy, avoid abrupt section changes where possible, and inspect critical edges by microscopy after final finishing. For Micro EDM, tungsten grain response and electrode wear are comparable with the feature size, making edge integrity and metrology more limiting than bulk hardness.
Surface Integrity and Post-Process
For Micro EDM on Pure Tungsten, use conservative energy, strong support and inspection focused on edge chipping and subsurface damage. Use low-energy finishing and account for electrode replacement or calibration before final sizing. Specify edge, recast and post-process requirements only on functional microfeatures, and use metrology that can distinguish true size from edge rounding and surface residue.
Pure Tungsten Micro EDM Checkpoints
- Confirm that the feature matches micro holes, micro slots, miniature cavities, fine pins, and sub-millimeter precision details.
- State the supplied condition: as-sintered or supplied condition and stress-relieved or recrystallized.
- Mark the controlled dimensions, functional surfaces, datum scheme, and inspection method.
Typical Parts and Features
- wear inserts
- high-temperature contacts
- hard-metal nozzles
- micro holes
- micro slots
- miniature cavities
Limits and Better Alternatives
Main Limit
Loose-tolerance or easily accessible features are rarely economical with Micro EDM. On Pure Tungsten, edge chipping and subsurface damage require strong support and low-energy finishing; the supplied condition still controls support, finishing, and surface-integrity review.
Consider Another Route When
Use conventional EDM for larger features, precision laser processing for suitable thin geometry, or mechanical micro-drilling where a tool can reach.
Practical Next Step
Send the Pure Tungsten drawing with condition, controlled geometry, tolerance, functional surface callouts, quantity, and inspection requirements. If the route is unclear, we will compare Micro EDM with the adjacent EDM or conventional process.
Practical Takeaway
Pure Tungsten is compatible with Micro EDM when the feature matches the process access. The supplied condition determines support, finishing, surface control, and inspection.
Technical Reference
Use the values as planning references and define the functional requirement on the controlled drawing.
Use This Guide to Prepare Your RFQ
Contact us when your drawing and requirements are ready for review.
- Process: Micro EDM
- Material: Pure Tungsten
- Drawing or part sketch
- Material grade
- Thickness / part size
- Quantity
STEP/STP, DXF, DWG, PDF, IGS/IGES or ZIP.
Confidential drawing review. NDA support available on request.