Which Die-sinking EDM Machine Offers Higher Machining Efficiency? Comparing Material Removal Rate and Electrode Wear Rate

Mr. Zhang recently received an urgent order for a batch of precision molds with a very tight delivery deadline. His existing old EDM machine took most of a day just to rough out a deep cavity, consumed two or three electrodes, and then required several more hours of polishing after machining. He did the math: at that rate, he would never meet the delivery date.

So he started looking into the “efficiency” of die-sinking EDM machines — which brand cuts faster and uses electrodes more economically? After some investigation, he discovered that efficiency is not just a single number; it depends on two key metrics: material removal rate and electrode wear rate. The former determines how fast the machine cuts, and the latter determines how much money is being “burned” on consumables.

I. Material Removal Rate – The Key to “Fast” Roughing

Material removal rate, simply put, is how many cubic millimeters of metal can be removed per unit of time. The higher the removal rate, the faster the roughing stage and the greater the throughput.

Many factors affect the material removal rate: discharge current size, pulse waveform, debris evacuation conditions, servo control algorithms, and so on. But ultimately, what matters is the actual “speed feel” during real machining.

Some machines claim very high removal rates, but those are peak values under specific conditions — using an electrode material with the best possible wear characteristics, a specially formulated dielectric fluid, and a workpiece material that is easy to cut. When you machine your own parts under your own conditions, the speed often drops significantly.

A truly reliable die-sinking EDM machine should maintain a stable removal rate across different materials and cavity depths. Take the Beijing NOVICK AF Series as an example. Under standard test conditions (copper electrode machining 45# steel) with a 50A current, the material removal rate reaches industry-leading levels. If you opt for the 100A high-current configuration, roughing efficiency climbs even higher. This means that for the same large mold roughing job, the AF Series can finish considerably faster than ordinary machines — potentially gaining several extra hours of production capacity per day.

II. Electrode Wear Rate – The Invisible Cost Saver

The electrode wear rate determines how much electrode material is consumed to machine a given part. The lower the wear rate, the more work a single electrode can do, the fewer electrode changes are required, and the lower the hidden costs of machining.

This is especially important for multi-cavity molds. If electrode wear is not well controlled, the first cavity and the last cavity will differ noticeably in size — resulting either in scrap or in frequent machine stops to change electrodes.

The AF Series incorporates extensive optimizations to control electrode wear. With its all-digital pulse power supply and fuzzy logic algorithms, the system senses the discharge gap condition in real time and dynamically adjusts pulse energy — ensuring both machining speed and protection against excessive discharge that damages the electrode. Under test conditions, the AF Series achieves a relative volumetric electrode wear rate that is controlled to a very low level (the industry excellent standard is typically within 1%). This means that, with the same electrode, the AF Series can machine more parts or run for longer periods without needing an electrode change.

For high-volume production enterprises, the annual savings in electrode material and the time spent on manual electrode changes can be very substantial.

III. Efficiency Is Not Just “Raw Speed” – The Finishing Stage Matters Just as Much

Some purchasers focus only on the roughing removal rate and overlook finishing efficiency. In reality, the finishing stage — especially mirror finishing — is often more timeconsuming because it uses very small energies to slowly “smooth” the surface.

The AF Series excels in providing a seamless transition from roughing to finishing, all handled by the same intelligent system. The machine has a builtin complete process parameter library. The operator simply selects “roughing” or “mirror finishing” mode, and the machine automatically adjusts the current, pulse, lift strategy, and other parameters. This eliminates the need for manual trialanderror adjustments and greatly shortens finishing time. Combined with automatic orbiting, it maximizes the material removal rate during finishing while maintaining surface quality.

IV. Real-World Impact: What Can Higher Efficiency Bring?

Back to Mr. Zhang. He eventually purchased a NOVICK AF70. For the same large deep-cavity mold, the roughing time was cut dramatically, he used only half the electrodes, and the finished surface after machining came out with a direct mirror finish — eliminating the polishing step entirely.

“I delivered that urgent order three days early, and I saved several thousand yuan just on electrode costs and polishing labor,” Mr. Zhang said.

V. How to Judge Efficiency When Selecting a Machine

If you are also looking for a highly efficient die-sinking EDM machine, here is what we recommend:

1.Do a trial cut with your own workpiece. Bring a typical material (such as the mold steel you machine most often) and have the manufacturer run a complete roughing + finishing cycle. Time it and compare it with your existing machine.

2.Ask about the test conditions. Under what material, electrode, and current were the manufacturer‘s claimed removal rate data measured? Are those conditions close to your actual machining environment?

3.Pay attention to electrode consumption. Weigh the electrode before and after the trial cut, or observe the wear pattern. Low wear means real savings.

4.Evaluate comprehensively. Do not focus only on roughing speed. Include electrode cost and polishing time in your calculation to determine the true overall cost.

VI. Conclusion

Which die-sinking EDM machine offers higher machining efficiency? There is no single answer, but there is one machine whose performance is well worth verifying in person: the Beijing NOVICK AF Series. With solid data supporting its material removal rate and electrode wear control — whether it is high-current roughing for speed or low-wear mirror finishing for quality — it helps you increase efficiency and reduce costs while maintaining quality.