Sinker EDM

You can count on our expertise in Sinker EDM Machining to create imprinted shapes in metal within blind cavities without cutting all the way through a part or otherwise compromising the integrity or stability of a workpiece

The sinker EDM process is largely used to create complex cavity shapes in tool and die applications. Such applications include metal stamping dies and plastic injection molds

Our Sinker EDM Process

The sinker process begins with machining a graphite electrode to form a “positive” of the desired cavity before the electrode is then carefully plunged or immersed into the workpiece, which causes sparking over its surface as the process closes the sparking gap, creating the distance required for sparking.


In our process, we focus on the most organic process associated with sinker EDMs, which starts by creating an inverse of the desired shape out of a copper or graphite electrode.  We use our high-speed mill, grinder or other high-functioning methods for this task.  Once we have the perfect inverse of the desired shape, we sink the electrode into the construction material to create the part.  This type of EDM process is perfect for mold making, creating threads and tapping holes, and creating shapes in very hard metals before placing them under heat treatment. 

Sinker EDM

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Our Sinker EDM Capabilities

We have an impressive array of machines with Sinker EDM capabilities to accomodate the most demanding of applications.  Our six-axis CNC Electrical Discharge Machines have 48-station electrode changers, and our large inventory of 3- to 7-axis machines have various take sizes to accomodate the many different sized parts for the Gas Turbine industry.

Hi-Tek's 6000 gallon central dieletric system provides 3 microbe filtration.  With this state-of-the-art Sinker EDM technology, we can create rows of shaped cooling holes, rows of round cooling holes, slots, grooves, pockets, and notches.  The electrodes used in these operations are designed and built by Hi-Tek to match our customer's exact specifications and applications.


AS 9100D Certification Including ISO 9001:2015

Nadcap Nonconventional Machining Certification

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Making components for the aerospace industry requires state-of-the-art equipment and the highest-quality metals and materials.

Materials In the Aerospace Industry

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Nickel Alloys, with their strengh, high oxidation resistance, and creep resistance makes virtually every nickel alloy well-suited for high-pressure operations where strength and durability are of the utmost importance.

Nickel-Based Alloys for Aerospace Applications

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EDM makes it possible to drill holes and cut slots in parts 70% faster, with better precision, and that will withstand extreme pressure and temperatures

Electrical Discharge Machining (EDM)

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Sometimes referred to as spark machining, sinker electrical discharge machining (EDM) is the primary or standard method of removing metal by using a series of rapidly recurring electrical discharges.

Sinker EDM

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