Category: Tube electrodes

A special application of die-sinking EDM is drill erosion (also spark erosion drilling, start-hole drilling or drill erosion). The machine used is called the start-hole boring machine. The machine is called this way because the resulting holes are mostly, but not always, used as starting or threading holes for subsequent wire EDM work.

The basic technology is consistent, but the unloading strategies and machine design are optimized for the fastest possible production of bores. The electrodes are automatically pushed in to compensate for electrode burn-off. The electrode rotates during the manufacturing process, which results in even burning and faster removal from the workpiece. Dielectric is constantly pumped through the electrode tube (pressure up to 60 bar) to rinse away the removed material. The particles that are removed during the erosion process improve the conductivity of the dielectric used over time, consequently the total electrical conductivity of the dielectric increases. However, there are also manufacturers who enrich their dielectric with so-called satellite electrodes in order to achieve this improvement right from the start.

Depending on requirements, electrodes with different channels can be used.

Single channel

A-type

B-type

D-type

C-type

Y-type

F-type

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