Technical Reference
EDM Cost Factors Technical Reference
EDM cost is driven by setup, cut length or cavity volume, depth or height, pass count, electrodes, material handling, quantity, and inspection—not part weight alone. A quote becomes unreliable when quantity, material condition, feature access, tolerance, finish, inspection, post-processing, and delivery scope are missing.
Quick Answer
EDM cost is driven by setup, cut length or cavity volume, depth or height, pass count, electrodes, material handling, quantity, and inspection—not part weight alone.
RFQ Preparation Points
What to Send
A whole-part fine finish, unnecessary ultra-tight dimensions, or late inspection requirements can dominate price. The consequence changes fit, function, or service performance for the Cost Factors decision; it is not only a change in surface appearance.
How to Use the Files
Reduce cost by keeping tight tolerance and fine finish on functional features, approving repeat fixturing, and using hybrid processes for easy geometry. When planning Cost Factors, apply the requirement only to the dimensions and faces that control fit, function, service life, or documented release.
What Causes Delays
A quote becomes unreliable when quantity, material condition, feature access, tolerance, finish, inspection, post-processing, and delivery scope are missing. The shop must either add contingency or revise the price after clarification.
What Each Input Does
EDM cost is driven by machine time, number of rough and finish passes, electrode manufacture, wire consumption, setup, flushing difficulty, inspection, and post-processing. Tight requirements become expensive when they are applied to the whole part instead of the few features that control function. This mechanism explains the limits and behavior that matter when planning Cost Factors.
EDM Cost Factors Reference
| What you're asking | What you can expect |
|---|---|
| Driver | Planning effect |
| Setup | programming and fixture effort |
| Machining | cut length, cavity volume, depth, or passes |
| Electrodes | design, manufacture, count, and wear |
| Inspection | method, report, and samples |
| Quantity | prototype, first article, and batch strategy |
How the Review Uses the Information
Use a simpler conventional route on easy geometry and reserve EDM, detailed reports, and extra finishing for the features that need them. A quote becomes unreliable when quantity, material condition, feature access, tolerance, finish, inspection, post-processing, and delivery scope are missing.
Inspection and Surface Inputs
Assign surface, edge, and sub-surface requirements only where they affect function, and give each requirement its own acceptance method. For Cost Factors, tie the accepted condition to the feature and inspection method named in the drawing.
Cost Factors Drawing and Release Checkpoints
- Identify the controlled feature, material condition, access direction, and functional datum for this Cost Factors decision.
- Separate dimensional requirements from texture, edge, recast, corrosion, fatigue, or post-process acceptance.
- State the inspection method, sampling or first-article requirement, drawing revision, quantity, and any documentation needed for release.
Practical Next Step
Assign surface, edge, and sub-surface requirements only where they affect function, and give each requirement its own acceptance method. Reduce cost by keeping tight tolerance and fine finish on functional features, approving repeat fixturing, and using hybrid processes for easy geometry.
What to Remember
EDM cost is driven by setup, cut length or cavity volume, depth or height, pass count, electrodes, material handling, quantity, and inspection—not part weight alone. A release-ready RFQ removes assumptions about geometry, material state, quantity, finish, revision, and acceptance evidence.
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.
- 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.
Frequently Asked Questions
What drives EDM cost most?
Geometry, setup, passes, electrodes, material handling, and inspection.
Does higher quantity always reduce lead time?
No. Batch machining and inspection still scale with the route.
When is a sample useful?
When fit, surface, edge, or repeatability is expensive to correct later.
How can cost be reduced?
Widen nonfunctional tolerances and use fine finish only on functional faces.