Sinker EDM, also called cavity type EDM or RAM EDM consists of an electrode and work piece submerged in an insulating liquid such as, more typically, oil or, less frequently, other dielectric fluids. The electrode and work piece are connected to a suitable power supply. The power supply generates an electrical potential between the two parts. As the electrode approaches the work piece, dielectric breakdown occurs in the fluid, forming a plasma channel, and a small spark jumps.

These sparks usually strike one at a time because it is very unlikely that different locations in the inter-electrode space have the identical local electrical characteristics which would enable a spark to occur simultaneously in all such locations. These sparks happen in huge numbers at seemingly random locations between the electrode and the work piece. As the base metal is eroded, and the spark gap subsequently increases, the electrode is lowered automatically by the machine so that the process can continue uninterrupted. Several hundred thousand sparks occur per second, with the actual duty cycle carefully controlled by the setup parameters. These controlling cycles are sometimes known as "on time" and "off time".

The on time setting determines the length or duration of the spark. Hence, a longer on time produces a deeper cavity for that spark and all subsequent sparks for that cycle, creating a rougher finish on the work piece. The reverse is true for a shorter on time. Off time is the period of time that one spark is replaced by another. A longer off time, for example, allows the flushing of dielectric fluid through a nozzle to clean out the eroded debris, thereby avoiding a short circuit. These settings can be maintained in micro seconds. The typical part geometry is a complex 3D shape, often with small or odd shaped angles. Vertical, orbital, vectoral, directional, helical, conical, rotational, spin and indexing machining cycles are also used.


WHO WE ARE

Adron Tool Corporation was among the first to recognize and utilize wire EDM as a true production process. During more than 20 years of specializing in wire EDM, we have completed thousands of production jobs for almost every industry. We have 50 high-speed wire EDM machines in all sizes; including the largest wire EDM machine available, able to handle work pieces weighing up to 10,000 lbs.

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Business Address:
Adron Tool Corp.
P.O. Box 960
Menomonee Falls, WI 53051
P: 262-255-4433

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