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CNC Sinker EDM:
An extension of the basic sinker EDM which adds many advanced capabilities such as the ability to cut in any direction, to orbit and vector, to position and do multiple operations, and to have programmable, varied cutting settings. Although the basic cutting process is still the same, in actual use, CNC Sinker EDM is almost a totally different process, offering advantages of faster cutting, improved geometric accuracy, lower electrode wear, ability to hold tighter tolerances, improve surface finishes, and reduced cost through greater automation.

Thin or Fragile parts
There is no physical contact between the electrode and the workpiece. Unlike tradition machining processes where the cutting tool must generate physical pressure to cut, EDM utilizes the heat of tiny electrical sparks to slowly and precisely erode the workpiece. In addition, only minimal clamping forces are required to hold the part for EDM, minimizing the possibilities of damage and distortion.

Inaccessible Features
Inaccessible features, such as cross connections between bores, or features cut sideways at the bottom of deep, blind cavities, can be readily produced without having to enter externally and plugging afterwards. The electrode can be mounted on an arbor, which is then manipulated into position inside the workpiece, and then the feature can be cut in any direction. In especially tight quarters, a through-feature can be EDM'ed from both directions to meet in the middle. In many cases, EDM is the only way these types of features can be produced.