CNC Waterjet VS EDM



When deciding on a cutting method, the tolerance level determines how much precision you can apply for cutting and shaping work materials.


In this post, we’re going to compare Wire EDM and CNC Waterjet Cutting. Although the techniques may seem to be similar, several differences give EDM cutting an edge over water jet cutting.


Waterjet technology is a technique used to shape a variety of materials from foam to ceramics to titanium. Using this method, a waterjet is used to produce a very high pressure of steam to make a narrow line in the given material. Depending on the stiffness of the material, a granular abrasive can be added to the waterjet. This helps to increase the cutting power.

You can think of waterjet cutting as a faster EDM machine with less precision. The primary advantage of waterjet cutting is the speed, making cuts 10 times faster than EDM. Waterjet cutting is also not limited to cutting conductive materials.


Waterjet cutting has come a long way because it is possible to improve waterjet precision by increasing the pressure of the waterjet, or by adding a granular abrasive, or by using a nozzle to make the cutting process more flexible. 

Wire EDM cutting is a process that can cut and shape tough materials like titanium and steel. The key is that the workpiece must be electrically conductive.

Then an electrode creates a spark that produces intense heat. Temperatures can enter the range of 8,000 to 12,000 degrees Celsius, easily melting just about anything. This spark is very carefully controlled so that the material can be shaped as water carries away the eroded particles and acts as a coolant. This way the spark only affects the chosen surface of the given material.

One of the major benefits of EDM cutting is highly accurate precision. Wire EDM is about 10 times more accurate than waterjet cutting.