What Types Of Materials Can Be EDM’d?

Any and all materials that conduct electricity are a candidate for EDM, such as:
  • Inconel
  • Tool Steel
  • Stainless Steel
  • Super Alloys
  • Tungsten & Titanium Carbide
  • Polycrystalline Diamond (PCD)
  • Aluminum
  • Cubic Boron Nitride (CBN)

What Are The Different Types Of EDM Machines?

Wire EDM
  • This process utilizes an electrically conductive wire primarily made of brass to cut holes or contours that extend completely through a workpiece
  • Best Uses: Holes, Tapered Surfaces, Die Openings, Gears, Plastic Mold Components and High Precision Machined Parts
  • Tolerance: 60 millionth contour accuracy can be attained under optimum conditions with our equipment
  • Surface Finishes Achieved can be as low as a measurable .1 Ra (3-4 RMS).
However, surface finish varies based upon material type, wire diameter and material thickness. Our best finish attainable is what we’ve described and it can be reached on a fairly substantial number of material and thickness combinations. CNC Ram EDM
  • Utilizes an electrically conductive electrode to erode a cavity to depth and size
  • Tolerance: .0002 can be attained on a part to part basis under optimum conditions with our equipment
  • Surface Finish: as low as .2 Ra (8 RMS) but please see the notes above
Hole Popper EDM
  • Utilizes an electrically conductive tube type electrode to erode a hole to a particular depth or through a work piece

What About Burrs Created in the EDM Process?

Generally, wire EDM is a burr-free process within reasonable limits. As the process capability approaches the finest contour accuracies that the process is capable of, the surface finish of the workpiece needs to be processed accordingly, resulting in an exceptionally fine cutting edge. For Ram EDM, burr formation is more common as there is typically more material removed and the work piece is generally processed to a coarser finish. Keep in mind that these burrs that we are referring to are always significantly smaller than those produced by more traditionally machined/ground processes.

What Is The Smallest Radius That Can Be Wire EDM’d?

We can accurately maintain an internal radius of 0.0008″ to 0.0010″ cost-effectively using fine wire. This is under optimal conditions to be sure, but it is done at NEDCO on a regular basis. For optimum cost efficiency, as well as tool longevity, try to maintain a .006 minimum internal corner radius, if possible. We’ve even produced .0013″ wide slots in Tungsten Carbide utilizing .0008″ wire.

What Are The Smallest Features That Can Be Wire Cut?

There are several variables that determine minimum feature size. First, is the ability to produce a start hole small enough! We regularly produce features in the .005 (0.13mm) x .005 (0.13mm) range with .002 (0.05mm) minimum internal corner radii as a standard.

What Wire Sizes Does NEDCO Use?

The smallest wire we utilize is .0008″ (0.020mm) diameter and the largest is .0130″ diameter.

Can You Cut Blind Holes In A Wire EDM Machine?

No. Wire must pass thru the material to be cut. Conventional (RAM) EDM is required to burn blind holes and we have substantial capacity in RAM EDM, as well as being Connecticut’s oldest active EDM shop (since 1957).

What Type Of Files Do You Accept?

We can read many of the standard files which include DXF, DWG, IGES, PDF, SLDPRT, SLDDRW, and CADL. Examples of compatible CAD systems are Autocad, CADKEY, SolidWorks, Pro-E, Kubotek, Inventor, and others. Send us a file through our online Quote form.