Process & Material
C360 Brass Small Hole EDM Drilling Thickness Review (20–50 Mm)
C360 Brass at 20–50 mm changes how Small Hole EDM must be supported, flushed, finished, and inspected. The controlling dimension is hole diameter, depth, depth-to-diameter ratio, straightness, breakthrough and flushing, not merely the outside stock size.
Quick Answer
For Small Hole EDM on C360 Brass, treat 20–50 mm as a setup input rather than a guaranteed accuracy band. Confirm the real hole diameter, depth, depth-to-diameter ratio, straightness, breakthrough and flushing, material condition, datum, functional faces, and inspection method before assigning tolerance or finish.
Key Thickness Decisions
What This Thickness Range Means
Through-hole depth can create a moderate aspect ratio; flushing pressure, straightness and breakthrough must be planned together. On C360 Brass, the supplied condition still changes support and surface response. This is the Small Hole EDM thickness decision; it does not turn the range into a machine promise.
Choosing the Right Setup
For Small Hole EDM on C360 Brass at 20–50 mm, plan electrode diameter, true path depth, aspect ratio, flushing, rotation, straightness, and breakthrough support. Then state the supplied condition, support the functional features, and define surface and inspection requirements separately. Apply the tightest tolerance and finest finish only to the dimensions and faces that control function.
What to Watch For
At 20–50 mm, the failure is not simply “too thick” or “too deep.” Depth-to-diameter ratio becomes the main control. The electrode wears shorter and smaller as it advances, flushing pressure must carry debris through a long tube, and the exit can wander. Use guides, staged electrodes, and separate entry/exit position and diameter inspection. If the setup ignores that physical progression, the named feature can pass at the accessible face while failing at depth, at the exit, or after unclamping. The C360 Brass condition must be included in the same inspection decision.
Technical Context
A rotating tubular electrode feeds toward the workpiece while dielectric is pumped through its center. At 20–50 mm, Depth-to-diameter ratio becomes the main control. The electrode wears shorter and smaller as it advances, flushing pressure must carry debris through a long tube, and the exit can wander. Use guides, staged electrodes, and separate entry/exit position and diameter inspection. Control electrode runout, guides, through-electrode flushing, breakthrough support, and entry-versus-exit inspection. For C360 Brass, the supplied condition still determines support and surface acceptance.
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. |
Thickness Range Reference
| Thickness or depth input | What it means for this process |
|---|---|
| 20–50 mm | Through-hole depth can create a moderate aspect ratio; flushing pressure, straightness and breakthrough must be planned together. |
| Primary controls | Plan electrode diameter, path depth, angle, flushing pressure, rotation, straightness, and entrance and exit conditions. |
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 | 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. |
| finished bar condition | 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. |
Thickness Impact
C360 Brass is free-machining brass with good conductivity and comparatively easy conventional machinability. In the 20–50 mm setup, state the supplied condition, support the functional features, and define surface and inspection requirements separately. The material condition changes support and surface response, while Small Hole EDM determines how the feature is accessed and controlled.
Surface and Edge Control
For Small Hole EDM on C360 Brass at 20–50 mm, inspect the functional face or edge from its own datum. Use gentle fixturing and a finish strategy that protects contact, sealing or heat-transfer surfaces. Keep texture, edge condition, recast, corrosion protection, and post-processing as separate acceptance items when service requires them.
C360 Brass Small Hole EDM Thickness Checkpoints
- Show the actual true hole path depth represented by 20–50 mm, not only the outside part size.
- Plan electrode diameter, path depth, angle, flushing pressure, rotation, straightness, and entrance and exit conditions.
- Mark the functional tolerance, finish, datum, and inspection method on the drawing.
Limits and Better Alternatives
Main Limit
The 20–50 mm label cannot replace the real hole diameter, depth, depth-to-diameter ratio, straightness, breakthrough and flushing or the supplied C360 Brass condition. EDM is best reserved for geometry that justifies it rather than simple open features.
Consider Another Route When
Use mechanical drilling for accessible easy-cutting material, laser drilling for suitable thin high-volume parts, or Micro EDM for smaller precision features.
Practical Next Step
Send the C360 Brass drawing with its condition, the actual true hole path depth in the 20–50 mm range, feature geometry, controlled tolerance, surface requirement, quantity, and inspection method.
Practical Takeaway
For C360 Brass at 20–50 mm, plan Small Hole EDM from the real feature axis, support, debris control, and inspection method instead of treating the range as a blanket capability statement.
Request a Machining Feasibility Review
Send material grade, drawing files, tolerance and quantity. We confirm process fit before quoting.
- Process: Small Hole EDM
- Material: C360 Brass
- Thickness: 20–50 mm
- 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
Does 20–50 mm alone define Small Hole EDM capability?
No. It only describes one setup dimension. Final capability follows the actual hole diameter, depth, depth-to-diameter ratio, straightness, breakthrough and flushing, material condition, access, datum, and inspection method.
What controls the setup in this range?
The main controls are electrode diameter, true path depth, aspect ratio, flushing, rotation, straightness, and breakthrough support. Their importance changes with the real feature geometry rather than the nominal range label.
What should be watched on C360 Brass?
The final feature may pass size inspection while failing its surface, edge, corrosion, or stability requirement Use state the supplied condition, support the functional features, and define surface and inspection requirements separately and release only the functional dimensions and faces that have a defined acceptance method.
What should the drawing identify?
Show the true feature path or section represented by 20–50 mm, the C360 Brass condition, controlled datum, tolerance, finish, quantity, and inspection route.