Process & Material
Tungsten Copper Small Hole EDM Drilling Feasibility Review
Tungsten Copper can be machined with Small Hole EDM when the geometry matches small through holes, deep holes, angled holes, cooling holes, vent holes, and start holes in hard or heat-resistant alloys. Tungsten Copper is a powder-metallurgy tungsten-copper composite combining refractory skeleton with conductive copper; the supplied condition affects support, discharge energy, finishing, and inspection.
Quick Answer
Small Hole EDM is suitable for Tungsten Copper when the feature is a small, deep, angled, cooling, vent, or start hole in conductive material. The supplied condition must be stated before tolerance and surface requirements are confirmed.
Key Material Decisions
How This Material Behaves
A powder-metallurgy tungsten-copper composite combining refractory skeleton with conductive copper. In Small Hole EDM, the supplied condition changes bore stability, breakthrough quality, wall finish, and the inspection plan for straightness and position.
Choosing the Right Condition
Choose Small Hole EDM for small through holes, deep holes, angled holes, cooling holes, vent holes, and start holes in hard or heat-resistant alloys. State the exact Tungsten Copper condition, then set tolerance, finish, support, and inspection from the controlled feature rather than the whole part.
Risks to Manage
For Small Hole EDM, local composition, porosity and brittle tungsten-rich edges can create nonuniform discharge and chipping. While pressure and electrode condition change along the true hole depth, runout, flushing loss and breakthrough loading can separate entry quality from exit quality, with the highest consequence at copper-rich, tungsten-rich and porous composite regions. The Tungsten Copper feature may therefore show path drift, taper or exit breakup where local composition changes along the wall. For Tungsten Copper, qualify compensation on the actual composite, reduce finish energy and inspect phase-dependent erosion or edge breakout. Inspect entry, exit, taper, position and wall condition independently; document geometry, phase-selective erosion, porosity and edge breakout for Tungsten Copper.
How Small Hole EDM Works on Tungsten Copper
Small Hole EDM advances a rotating tubular electrode through Tungsten Copper while dielectric exits at the cutting tip. Electrode wear, runout, internal flushing, true hole depth and breakthrough support control entry-to-exit diameter, taper, straightness and wall condition. Hole diameter, depth and depth-to-diameter ratio—not stock thickness alone—define the process limit.
Small Hole EDM Capability Reference
| What you're asking | What you can expect |
|---|---|
| Feature types | small through holes, deep holes, angled holes, cooling holes, vent holes, and start holes in hard or heat-resistant alloys |
| Tolerance | ±0.010–0.050 mm |
| Surface finish | Hole-wall finish is feature-dependent |
| Typical diameter | About 0.3–3.0 mm for ordinary planning |
| Depth driver | Depth-to-diameter ratio, straightness, and breakthrough |
| Main limitation | Very small diameter combined with extreme depth may require specialized equipment, staged electrodes, and dedicated metrology. |
Material Condition Reference
| Condition | What to expect | Watch out for | Surface notes |
|---|---|---|---|
| annealed | Use gentle fixturing and adjust energy for high conductivity. | Soft edges can mark or roll under poor support. | Keep contact, bearing, and cosmetic faces as separate finish requirements. |
| half-hard or work-hardened | Balance work-hardening stress with wear compensation. | Thin sections can move and micro features can round as electrodes wear. | Inspect edge radius and functional texture. |
How This Material Behaves
Tungsten copper is a composite in which refractory tungsten and conductive copper respond differently to each discharge. In EDM, this means the copper phase can erode faster, leaving texture variation or undercut around tungsten-rich regions. Use stable low-energy finishing, avoid assuming one uniform removal rate, and inspect functional faces for local erosion and edge integrity. For Small Hole EDM, local composition, porosity and brittle tungsten-rich edges can create nonuniform discharge and chipping. In small holes, electrode wear and breakthrough can enlarge or smear the exit edge even when the entry size is stable.
Surface Integrity and Post-Process
For Small Hole EDM on Tungsten Copper, use gentle fixturing and a finish strategy that protects contact, sealing or heat-transfer surfaces. Reduce discharge energy near final size and breakthrough, then evaluate entry, exit, taper and wall condition separately. For fatigue-, flow- or seal-critical holes, specify recast acceptance or post-process cleaning and finishing instead of relying on diameter alone.
Tungsten Copper Small Hole EDM Checkpoints
- Confirm that the feature matches small through holes, deep holes, angled holes, cooling holes, vent holes, and start holes in hard or heat-resistant alloys.
- State the supplied condition: annealed and half-hard or work-hardened.
- Mark the controlled dimensions, functional surfaces, datum scheme, and inspection method.
Typical Parts and Features
- electrical contacts
- electrodes
- busbar details
- turbine-blade cooling holes
- mold and die vent holes
- injector and nozzle holes
Limits and Better Alternatives
Main Limit
Hole depth, diameter, aspect ratio, flushing, and breakthrough quality—not stock thickness alone—set the practical limit. On Tungsten Copper, local composition, porosity and brittle tungsten-rich edges can create nonuniform discharge and chipping; the supplied condition still controls support, finishing, and surface-integrity review.
Consider Another Route When
Use mechanical drilling when the tool can reach economically, laser drilling for suitable thin geometry, or Micro EDM for smaller precision holes.
Practical Next Step
Send the Tungsten Copper drawing with condition, controlled geometry, tolerance, functional surface callouts, quantity, and inspection requirements. If the route is unclear, we will compare Small Hole EDM with the adjacent EDM or conventional process.
Practical Takeaway
Tungsten Copper is compatible with Small Hole EDM when the feature matches the process access. The supplied condition determines support, finishing, surface control, and inspection.
Additional Project Information
Include application, destination and end-use notes together with the material, quantity and drawing requirements.
Project Details for Technical Review
Include application and end-use notes when they affect material, inspection, documentation, or export review.
- Process: Small Hole EDM
- Material: Tungsten Copper
- Drawing or part sketch
- Material grade
- Thickness / part size
- Quantity
- Tolerance and critical dimensions
- Surface finish or inspection requirement
STEP/STP, DXF, DWG, PDF, IGS/IGES or ZIP.
Confidential drawing review. NDA support available on request.