Precision Graphite Solutions

Sinker EDM – Dielectric Fluids

Choosing Dielectric Fluid for Sinker EDM Applications
April 2018

Choosing the correct dielectric fluid for your EDM application is not always as straightforward as it might seem. Many criteria need to be taken into account. Some are obvious, such as degree of metal removal and electrode wear, while others are much more subtle.

Dielectric fluid is a material whose main purpose is to prevent or rapidly quench electric discharges. Dielectric liquids are used as electrical insulators in high voltage applications to provide electrical insulation, suppress corona and arcing, and to serve as a coolant.

A good liquid dielectric should have high dielectric strength, high thermal stability and chemical inertness against...Read more

Sinker EDM Basic Terminology Part II – Flushing


MAR 2018 Blog

It’s been said the 3 most critical things about a good sinker EDM burn condition are flushing, flushing, and flushing. This is still true today but modern machines have built in technologies that assist with flushing even when the operator doesn’t think about flushing. More on these in a bit.

Flushing is a critical part of the EDM process, as it removes contaminated fluid and eroded particles, and replaces them with clean, temperature controlled fluid. This removes contamination from the spark gap that could develop into undesirable conditions like slow, unstable burns, pitting of the work piece, and...Read more

Sinker EDM Basic Terminology – Part I

RAM EDM, otherwise known as “Sinker EDM” or “Plunge EDM” has been around for over fifty years. Though widely used, there are some who are unfamiliar with certain EDM terminology.


Since Sinker EDM uses electrical energy to remove material, it stands to reason that the make-up of the material will have a direct impact on the rate of removal. This being the case there are three critical things to keep in mind.

• Since machining with Sinker EDM or Plunge EDM occurs by using electrical energy the electrical conductivity plays a key role in how fast the Spark Gap can ionize allowing a spark to...Read more

A Little History of the Sinker EDM

Electrical Discharge Machining or EDM Machining makes it possible to work with hard metals for which traditional machining techniques are inadequate.

The EDM machining process came into being during the 1770s when it was discovered by an English Physicist name Joseph Priestly, who discovered the effect of electrical discharges on various metals. However, the process was not widely used until 1943 when Russian scientists B.R. and N.I. Lazarenko discovered how to exploit the destructive effects of an electrical discharge technique that could be controlled and used for machining work.

Any conductive material can be machined using Sinker EDM such as aluminum, brass, carbide, copper, stainless steel, tool steels, titanium etc. Sinker EDM is a...Read more

Reducing Sinker and Wire EDM Consumable Costs

A key area for improvement in EDM operations is the reduction of consumables. New technologies, machine settings and improved material grade limit ram or sinker EDM electrode wear to 0.1% while maintaining productive machining speeds. For wire EDM, new low-consumption technologies reduce the biggest expense—the wire itself—by as much as 50 percent.

With all EDM machines you experience the benefits of designing and cutting complex shapes and tapered holes with hard metals. You can depend that the machine has the capacity to cut exactly what you want. Sinker EDM machines use an electrode and workpiece submerged in liquids such as oil or dielectric water. A power supply is connected...Read more

When It Comes To EDM Graphite – You Get What You Pay For


November 2017 Blog
Karl Schmidt, QMR/SSBB - Quality Manager
Graphel Carbon Products

This past October, a Japanese company named Kobe Steele was found to be falsifying test records and substituting materials for various genuine metallics used in the transportation industry.  Although rare, this can and does happen in the graphite industry.

Graphel Carbon Products has been AS9100 Certified since 1994, and we verify all of our materials and suppliers.  We only sell materials that are genuine and verified, and do not substitute.  As the Quality Manager here at Graphel, I take my position very seriously,...Read more

Something to Think About – Artificial Intelligence in Manufacturing

Artificial Intelligence

Jeff Immelt, previous CEO of manufacturing giant GE recently stated about Artificial Intelligence, “Companies need to become digital to survive - We must turn information into insights and insights into outcomes.”

That implies we have something to think about:

Manufacturing is changing, which isn’t a bad thing. But technology will become difficult to keep up with if we don’t keep an open mind. Though we embrace new technology in some parts of our shop, one trend in particular should be on our radar:

Artificial Intelligence

It will dramatically change our industry. However, coming to terms with that fact can be...Read more

Are your suppliers providing you the quality that meets your quality expectations?

Vendor Quality

Quality is the backbone of your business – without it, you wouldn’t have the reputation in the industry as a quality manufacturer. So, once you have your quality standards set, it’s time to expect the same from your suppliers.

While quality standards will vary, the importance of quality, especially in manufacturing, is a universal requirement. Customers need to be able to trust your brand. To gain that trust, the first thing you need from your suppliers are quality products.

Here are some tips on how to get the quality that you and your customer are depending on.

1. Decide on your own quality standards first.

First and foremost,...Read more

Your Supplier Choice Many Be As Important As Your Material Choice

Your organization spends hours working with suppliers to find the optimal balance of price and material grade. You negotiated, compromised, sent RFQ’s and placed PO’s. In the past, many companies didn’t communicate with their suppliers until the next order or delivery was needed.

Not anymore. Surveys tell us that the attitude toward supplier relationships has changed over the past decade. Companies are now realizing the importance of leveraging strategic relationships with their suppliers. In a poll taken in 2016, 63% of procurement professionals had improving collaboration with suppliers as one of their top KPIs for the year.

In today’s competitive market place, I would argue...Read more

Understanding electrode parameters can improve EDM Efficiency


Robert Fothergill, EDM Applications Specialist with Poco Graphite, recently published an article in Mold Making Technology discussing that understanding all the electrode parameters can improve EDM efficiency. I can’t agree more.

As discussed, sinker EDM machining technology has improved significantly over the years. These changes effect the processes and decisions an EDM machinist will face when running the machine. But, some performance factors remain the same even with the advanced technology:

• Machinability - a balance between easy to machine and resilient enough to withstand the machining process

• Metal Removal Rate – achieving the proper electrode...Read more

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