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Common electrode materials for electrical discharge machining in a sinker EDM with oil-based dielectric

When choosing an electrode material, you must consider many factors. The usual first decision is, should you choose a metallic or non-metallic electrode? Depending on the material to be removed, this can be as simple decision. Carbides and sintered metals require more...

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Can I use graphite or copper-graphite electrode materials to machine tungsten-carbide?

While graphite materials can be used to machine carbide materials, it is not the best method. One of the reasons is the extremely high electrode wear rate. Burning with a fine-grain graphite, such as DS4 or POCO-3, will lead to 50-60% electrode wear when used to...

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Back to Basics (4/6): Sinker EDM Machine Basics

Sinker EDM, also referred to as Ram EDM, uses electrodes machined from graphite or copper to shape the workpiece. Typically found in die/mold component manufacturing, a Sinker EDM raises and lowers (sinks) the electrode along the workpiece. Regardless of the name you...

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The Beginning of Ram Type EDM (Sinker)

Ram type (also called sinker type) EDM was the first type of Electrical Discharge Machining used in the manufacturing process. I was lucky enough to see the first EDM machine made for the purpose of eroding metal. Most historians give credit to a metallurgist couple...

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Understanding Sinker EDM Gear Form Machining

In an earlier Expert’s Corner (Understand Wire EDM Gear Form Machining – EDM Today Summer 2017), gear and involute geometry were examined along with the methods and capability that can be produced by Wire EDM. In this issue, we’ll explore Sinker EDM Gear Form...

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Selecting a magnetic chuck for a sinker EDM machine

Magnetic chucks are typically specialized for EDM applications. They are sealed differently than those used for grinding machines, as the oil and debris from the EDM process can damage and seize up the typical ON/OFF magnet levers. Several magnetic chuck manufacturers...

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