Process & Material
C260 Brass Small Hole EDM Drilling Feasibility Review
C260 Brass 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. C260 Brass is cartridge brass with good conductivity and strong cold-forming response; the supplied condition affects support, discharge energy, finishing, and inspection.
Quick Answer
Small Hole EDM is suitable for C260 Brass 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
Cartridge brass with good conductivity and strong cold-forming response. 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 C260 Brass condition, then set tolerance, finish, support, and inspection from the controlled feature rather than the whole part.
Risks to Manage
For Small Hole EDM, rolled temper and grain direction can affect thin sections, springback and edge stability. As a deep small hole approaches breakthrough, tubular-electrode wear and pressure loss can reduce exit diameter and shift the path; the interaction is most important at phase boundaries, local texture and thin functional edges. For C260 Brass, this can produce taper or exit breakup caused by differential erosion along the wall. For C260 Brass, qualify settings on the actual alloy condition, limit aggressive roughing, and compare local edge response before final sizing. Inspect entry, exit, taper, position and wall condition independently; document local texture, differential erosion and edge continuity for C260 Brass.
How Small Hole EDM Works on C260 Brass
Small Hole EDM advances a rotating tubular electrode through C260 Brass 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. |
| hard-drawn | Use conservative finishing on hard-drawn or aged stock. | Over-finishing can remove useful texture or shift contact dimensions. | Apply finishing only to functional faces. |
How This Material Behaves
C260 brass is a ductile copper-zinc alloy that is easy to form and relatively soft at edges. In EDM, this means thin contact features can flex, fixture marks can become the dominant defect, and fresh cut surfaces can tarnish before plating or assembly. Support spring-like sections, use low-force handling, and release edge condition and plating allowance separately from dimensional tolerance. For Small Hole EDM, rolled temper and grain direction can affect thin sections, springback and edge stability. 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 C260 Brass, 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.
C260 Brass 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, half-hard or work-hardened, and hard-drawn.
- 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 C260 Brass, rolled temper and grain direction can affect thin sections, springback and edge stability; 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 C260 Brass 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
C260 Brass is compatible with Small Hole EDM when the feature matches the process access. The supplied condition determines support, finishing, surface control, and inspection.
Request a Machining Feasibility Review
Send material grade, drawing files, tolerance and quantity. We confirm process fit before quoting.
- Process: Small Hole EDM
- Material: C260 Brass
- 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.
Frequently Asked Questions
Can C260 Brass be machined with Small Hole EDM?
Yes, when the feature is a small, deep, angled, cooling, vent, or start hole in conductive material. C260 Brass is electrically conductive and the final route follows the feature geometry and supplied condition.
What controls Small Hole EDM on C260 Brass?
The main process controls are electrode diameter, true hole depth, depth-to-diameter ratio, tubular-electrode wear, flushing pressure, breakthrough quality, and hole-wall inspection. The C260 Brass condition adds dimensional-stability and surface-integrity requirements.
What is the main risk?
For Small Hole EDM, rolled temper and grain direction can affect thin sections, springback and edge stability. As a deep small hole approaches breakthrough, tubular-electrode wear and pressure loss can reduce exit diameter and shift the path; the interaction is most important at phase boundaries, local texture and thin functional edges. For C260 Brass, this can produce taper or exit breakup caused by differential erosion along the wall. For C260 Brass, qualify settings on the actual alloy condition, limit aggressive roughing, and compare local edge response before final sizing. Inspect entry, exit, taper, position and wall condition independently; document local texture, differential erosion and edge continuity for C260 Brass.
What should I send for review?
Send the drawing, exact C260 Brass condition, controlled geometry, tolerance, functional surface requirements, quantity, and inspection expectations. If any item is undecided, send what you have and we will help complete the review.