Material Review
Gold EDM Machining
Gold is a very soft, dense and highly conductive precious metal. It is compatible with EDM, while feature access selects Wire, Sinker, Small Hole, or Micro EDM and the supplied condition sets support, finishing, surface control, and inspection.
Quick Answer
Gold is electrically conductive and can be machined by EDM. Feature access selects the process; the exact condition then sets support, finishing, post-processing, and inspection. The main concern is that surface marking, thin-feature distortion and material recovery can matter more than discharge stability.
Key Material Decisions
How This Material Behaves
Its condition changes dimensional stability, discharge response, surface-integrity risk, and the finishing plan.
Choosing the Right Condition
Select Wire EDM for through profiles, Sinker EDM for blind cavities, Small Hole EDM for small or deep holes, and Micro EDM for miniature features. State the exact Gold condition before assigning tolerance and finish.
Risks to Manage
The main material risk is clear: Surface marking, thin-feature distortion and material recovery can matter more than discharge stability. We manage it with condition-aware support, selective finishing, and inspection of the functional faces rather than one whole-part requirement.
How the EDM Route Is Selected
Feature access chooses the EDM route. The supplied Gold condition then changes support, discharge energy, finishing passes, post-processing, and the method used to verify the result.
Gold EDM Process Reference
| What you're asking | What you can expect |
|---|---|
| Through profiles | Wire EDM |
| Blind cavities and ribs | Sinker EDM |
| Small or deep holes | Small Hole EDM |
| Miniature holes, slots, or cavities | Micro EDM |
| Material-specific concern | surface marking, thin-feature distortion and material recovery can matter more than discharge stability |
Material Condition Reference
| Condition | What to expect | Watch out for | Surface notes |
|---|---|---|---|
| annealed | Use stable support and economical roughing. | Clamping and material condition can move delicate features. | Apply fine finishing only to functional faces. |
| work-hardened | Balance dimensional stability with feature-specific finishing. | Residual stress can shift thin sections or small details. | Identify wear, seal, fatigue, or contact surfaces. |
| finished or plated condition | Use conservative energy and selective inspection. | Finished or hardened surfaces can be sensitive to edge damage and recast. | Use lower-energy finishing or post-processing where function requires it. |
How This Material Behaves
Gold is extremely soft, dense, conductive, and costly. In EDM, this means the part can be damaged by clamping or handling before spark erosion becomes the limiting factor, and unnecessary overcut directly increases material loss. Use broad nonmarking support, minimize roughing stock, capture the final geometry with few controlled passes, and keep contact-surface cleanliness in the release plan.
Surface Integrity and Post-Process
For Gold, use protected fixturing, controlled finishing and recovery procedures for cut-off material. Mark fatigue, seal, wear, contact, corrosion, or cosmetic faces separately so nonfunctional surfaces are not over-finished.
Gold Planning Checkpoints
- State the exact grade and supplied condition: annealed, work-hardened, and finished or plated condition.
- Mark through features, blind forms, holes, and miniature details so each feature is routed to the correct EDM process.
- Identify critical datums, functional surfaces, corrosion protection, and any dimensional or metallurgical inspection.
Typical Parts
- fine contacts
- watch and jewelry details
- laboratory electrodes
Limits and Better Alternatives
Main Limit
For Gold, EDM requires a conductive workpiece and offers little advantage on open, loose-tolerance geometry that conventional machining can reach faster. Surface marking, thin-feature distortion and material recovery can matter more than discharge stability.
Consider Another Route When
Use CNC or grinding for accessible open geometry and simple precision faces; reserve EDM for hardness, access, sharp corners, deep small holes, and burr-free edges.
Practical Next Step
For a Gold EDM quote, send the drawing, exact material condition, critical dimensions, functional surface requirements, quantity, and inspection expectations. If the condition or process is uncertain, send the available material specification and drawing for review.
Practical Takeaway
Gold is suitable for EDM. Feature access selects the process, and 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.
- Material: Gold
- 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.