Process & Material
Platinum Sinker EDM Feasibility Review
Platinum can be machined with Sinker EDM when the geometry matches blind cavities, ribs, shaped pockets, mold details, deep forms, and internal geometry that a traveling wire cannot reach. Platinum is a dense, corrosion-resistant precious metal with high value and relatively soft handling behavior; the supplied condition affects support, discharge energy, finishing, and inspection.
Quick Answer
Sinker EDM is suitable for Platinum when the feature is a blind cavity, rib, pocket, or internal form that a shaped electrode can reach from one side. The supplied condition must be stated before tolerance and surface requirements are confirmed.
Key Material Decisions
How This Material Behaves
A dense, corrosion-resistant precious metal with high value and relatively soft handling behavior. In Sinker EDM, the supplied condition changes electrode wear, cavity-floor consistency, corner growth, and the finishing strategy—especially on deep ribs and textured surfaces.
Choosing the Right Condition
Choose Sinker EDM for blind cavities, ribs, shaped pockets, mold details, deep forms, and internal geometry that a traveling wire cannot reach. State the exact Platinum condition, then set tolerance, finish, support, and inspection from the controlled feature rather than the whole part.
Risks to Manage
For Sinker EDM, material accounting, surface marking and recovery of cut-off stock can outweigh ordinary process concerns. Poor evacuation can concentrate discharge energy at corners and accelerate local electrode loss as roughing transitions to final orbit and floor sizing, especially around high-value edges, recovered slugs and mark-sensitive surfaces. The practical failure in Platinum is corner overburn, fixture marking or unnecessary removal from a high-value cavity. For Platinum, use protected fixturing, minimize unnecessary stock removal and maintain a controlled recovery and handling procedure. Compare the roughing electrode, finish electrode and final cavity rather than relying on nominal electrode size; document geometry, handling marks, material loss and recovery records for Platinum.
How Sinker EDM Works on Platinum
Sinker EDM reproduces a shaped electrode as a blind cavity in Platinum. Electrode material, wear, orbit, pulse energy and debris evacuation control wall size, floor depth, corner definition and surface condition. Where final size or texture is critical, roughing and finishing electrodes should be planned as separate operations.
Sinker EDM Capability Reference
| What you're asking | What you can expect |
|---|---|
| Feature types | blind cavities, ribs, shaped pockets, mold details, deep forms, and internal geometry that a traveling wire cannot reach |
| Tolerance | ±0.008–0.030 mm |
| Surface finish | Ra 0.2–6.3 μm |
| Electrode choice | Graphite or copper selected from cavity, finish, and wear needs |
| Primary cavity limit | Depth, rib width, access, and debris evacuation |
| Main limitation | Electrode access and debris evacuation limit deep, narrow blind geometry. |
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. |
How This Material Behaves
Platinum is dense, soft, highly corrosion resistant, and expensive. In EDM, this means fixture pressure and handling can damage the part more easily than the spark process, while unnecessary overcut wastes high-value material. Use nonmarking support, minimize roughing allowance, and clean functional surfaces without altering the final geometry. For Sinker EDM, material accounting, surface marking and recovery of cut-off stock can outweigh ordinary process concerns. In cavities, fixture protection, electrode compensation and limited roughing allowance are needed to avoid unnecessary material loss or surface marking.
Surface Integrity and Post-Process
For Sinker EDM on Platinum, use protected fixturing, controlled finishing and recovery procedures for cut-off material. Use roughing and finishing electrodes separately where cavity size or texture is controlled. Apply polishing, lapping or recast removal only to named functional faces, and inspect wall, floor and corner condition after the final surface operation.
Platinum Sinker EDM Checkpoints
- Confirm that the feature matches blind cavities, ribs, shaped pockets, mold details, deep forms, and internal geometry that a traveling wire cannot reach.
- State the supplied condition: annealed and work-hardened.
- Mark the controlled dimensions, functional surfaces, datum scheme, and inspection method.
Typical Parts and Features
- fine contacts
- watch and jewelry details
- laboratory electrodes
- mold cavities
- blind pockets
- deep ribs
Limits and Better Alternatives
Main Limit
Electrode access and debris evacuation limit deep, narrow blind geometry. On Platinum, material accounting, surface marking and recovery of cut-off stock can outweigh ordinary process concerns; the supplied condition still controls support, finishing, and surface-integrity review.
Consider Another Route When
Use Wire EDM for through profiles, CNC machining for open cavities with tool access, or grinding for simple flat precision surfaces.
Practical Next Step
Send the Platinum drawing with condition, controlled geometry, tolerance, functional surface callouts, quantity, and inspection requirements. If the route is unclear, we will compare Sinker EDM with the adjacent EDM or conventional process.
Practical Takeaway
Platinum is compatible with Sinker 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: Sinker EDM
- Material: Platinum
- 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.