EDM Electrodes

That’s Our Specialty

At Holepop, we believe in trust and collaboration when dealing with our customers. Collaboration includes the responsibility to keep our customers well informed about our electrodes, as a customer that knows the strengths and weaknesses of their electrodes stands to gain time and money. There are many different applications that call for EDM Small hole drilling, and one electrode’s weakness in one application may be a strength in another. This and all of the other different variables encountered in EDM—such as workpiece material and machine settings—can make it difficult to choose the right electrode.

With our wide array of electrodes, you will be sure to find one that fits your particular EDM machine or equipment. How well our EDM consumables do on your small hole EDM machine depend on two simple variables:

  • The type of material that the electrode is made of—brass, copper, or tungsten carbide.
  • The type of flushing hole or the desired internal diameter of the electrode. This is either a single hole diameter with no other internal walls or is a multi-channel type internal hole with multiple walls throughout the length of the electrode. Some electrodes dispense with the internal channels altogether. These are rods.
  • Let’s first discuss the main two types of EDM tubing material: brass and copper. 97% of all applications for EDM electrode hole-popping involve either brass or copper electrodes.

Single Hole Electrode Tubes vs. Multi-Channel Electrode Tubes

Another variable which ultimately determines successful EDM hole burning through a material or work piece is whether the brass electrode or copper electrode tube is has a single hole or multiple channels running directly through the ID or (Internal Diameter) of the electrode.

Basically, an electrode’s intended performance depends on the type of hole going through the center of the electrode, as different channel types are made for different purposes. One purpose is to direct water or coolant through the center of the electrode. This keeps the entire length of the brass or copper tube from overheating and burning up. If the electrode heats up too much it can soften and warp, thus preventing a straight drill or a consistent and accurate EDM hole.

The main factor that determines whether an EDM electrode tube would be single or multi-channel tube is whether the hole to be drilled is a through-hole or a blind hole. Blind holes are not drilled all the way through a workpiece, which leaves a slug or a nipple—a piece of material is still left untouched at the bottom of the hole.

  • A line of brass single-hole tubes.

    Single Hole (Single Channel) EDM Tubes

    Brass EDM tubing and copper EDM tubing can both be single hole. Single hole electrodes are usually cheaper in price because there is less material in the electrode. Single hole tubing is recommended only for hole burning applications that require a hole to be drilled entirely through the part.

    If you have further questions or would like clarification in regards to your machine, application or electrode type please email us here or call us directly at (714) 222-9899 for further questions. We would be happy to help you and would appreciate any feedback you have to offer.

  • A single brass multi-channel electrode.

    Multi-Channel EDM Tubes

    Multi-channel tubes are used for drilling a blind hole. The internal channels are designed to burn away any material left at the bottom of the hole, as the electrode has material inside the flushing hole that is used to disintegrate the work piece material.

    The internal channels are arranged in such a way that, as the electrode spins, no part of the workpiece is left unaffected by the electrode, and no slug or piece of material is left at the bottom of the hole.