Question: How Does An EDM Work?

What is EDM surface finish?

An EDM surface finish is different to one produced by conventional material removal processes.

Rather than exhibiting directionality, the texture is random, which is beneficial in many applications.

Furthermore, by taking multiple skimming passes, EDM finish quality can become almost mirror-like..

How accurate is EDM?

Unfortunately, there’s no simple answer. While accuracies of +/- 0.00004” (0.001mm) are sometimes quoted for wire EDM, +/- 0.0002” (0.005mm) is more widely accepted. The reality is that EDM accuracy depends on a combination of workpiece characteristics, the surface finish desired, and the time available for machining.

Can you wire EDM ceramic?

Even though conductive ceramics can be eligible to be machined by the EDM process, semi-conductive as well as non-conductive ceramics represent a considerable amount of challenges for the EDM process.

What are the advantages of EDM?

Advantages of EDM – part geometryThin walls are possible.Cut internal corners with very small radii.Cut thin slots in extrusion dies with wire EDM.Produce blind and high aspect ratio pockets with sinking EDM.Produce non-round openings and cavities.An alternative to broaching for 2D shapes like gears.

What are the two types of EDM machines?

EDM methods fall into two major categories, wire and ram. Ram/Sinker EDM has several sub-categories of its own. The best EDM method for a part depends on the material and machined shapes required.

What are the advantages and disadvantages of EDM?

Advantages and disadvantages for EDM Machining Complex shapes can be produced while it is difficult to be machined by conventional Machining. Extremely hard material can be cut with tight tolerance. Good surface finish can be obtained. The part can be machined without perceivable distortion, because there is no direct contact between tool and work piece.

Can you wire EDM titanium?

Why Titanium is a Good Choice for Wire EDM Services The biggest advantage titanium has compared to other metals such as stainless steel, chrome, copper or nickel is lower specific gravity. In the EDM world, a lower specific gravity means it can be cut faster than other metals.

How does a wire EDM cut steel?

The wire-cut type of machine arose in the 1960s for making tools (dies) from hardened steel. The tool electrode in wire EDM is simply a wire. To avoid the erosion of the wire causing it to break, the wire is wound between two spools so that the active part of the wire is constantly changing.

What are EDM machines used for?

EDM machines are generally used to achieve very complex shapes in extremely hard metals such as tungsten carbide, titanium, and hardened tool steel alloys.

What materials can be machined by EDM?

In general, every conductive material can be machined with electrical discharge machining. Common materials include metals or metal alloys such as hardened steel, titanium, and composites. Typically, the electrodes for die sinking EDM are made of copper or graphite.

Can you EDM Carbide?

Tungsten carbide, third in hardness to diamond and boron carbide, is an extremely difficult material to machine. Except for diamond cutting tools and diamond impregnated grinding wheels, EDM presents the only practical method to machine this hardened material.

Can you wire EDM graphite?

“Albeit slower than milling or turning, newer EDM power supplies can machine graphite with very complicated details, tight inside corners, and with extremely fine finishes and straightness,” said Bond. However, if this method is used, it is critical to dry the electrodes after the wire EDM process.