Sinker EDM



EDM Department specializes in Sinker EDM (Electrical Discharge Machining), also referred to as Conventional, Plunge or Ram EDM. Sinker EDM offers the ability to produce complex shapes without inducing stresses into the material and provides low-risk machining solutions for dies, molds, or parts with previous machining or labor hours. This process is ideal for any company looking to minimize machining risk with accuracy and reliability.

Sinker EDM - EDM Department Inc

What’s the difference between Sinker EDM & Wire EDM?

Unlike Wire EDM, Sinker EDM services do not cut completely through the material (unless desired), resulting in a wider variety of applications, such as blind cavities/keyways, thin walls, or cross-sections. This versatility makes sinker EDM an efficient technology for stamping dies and injection molds. Our vast library of EDM generator technologies offers the best surface finishes available in a multitude of materials. By maintaining strong and ongoing relationships with our technology partners we are able to stay on the forefront of Sinker EDM capabilities and meet the ever-evolving needs of our customers. EDM Department provides prototyping, production, and contract manufacturing Sinker EDM services. We will work with you in providing the best solution to your most difficult EDM project requirements.

Contact us here to receive additional information related to our Sinker EDM services.

Sinker EDM - EDM Department Inc
  • Standard tolerances (0.0010″ to 0.0005″) and high precision tolerances as tight as 2µm
  • Micromachining tolerances of 1µm and below
  • Feature Sizes as Small as 40µm
  • Aspect Ratios up to 38:1
  • Fine (micro) hole diameters as small as 40µm
  • Surface finishes down to 4Ra µin (micro inch)
  • Small quantities of 1-50+ pieces
Sinker EDM - EDM Department Inc

Small Hole Sinker EDM Drilling

When accuracy, superior edge, and metallurgical quality are required, our small hole sinker solutions achieve productive results with high precision EDM Hole Drilling of small diameter holes with excellent edge quality, high accuracy, and consistency.


  • Small hole EDM drilling is used for turbine blades
  • Fuel injectors
  • Cutting tool coolant holes
  • Ejector holes in hardened punches
  • Vent holes in molds


Sinker EDM - EDM Department Inc

Along with our Wire EDM solutions, Sinker EDM is also one of our specialty areas. With a vast knowledge of conventional EDM technologies and over 20 years of experience, we are confident we can produce your next RAM EDM project to your exact specifications. A few projects we have completed include:

  • Interconnect Components
  • Fiber Optic Components
  • Medical Components
  • Optical Lenses
  • Research & Development
  • Aerospace Industry
  • Defense Industry
  • Digital Manufacturing & Design Innovation Institute (DMDII)
  • Nationally Ranked Universities
  • Research Labs through the country, ex: SLAC National Accelerator Laboratory.


Sinker EDM - EDM Department Inc

EDM strives to meet your needs. Through strategic partnerships with a vast array of qualified material suppliers, we manufacture using the materials you require, all while meeting strict standards. When it comes to Sinker EDM we have worked with a diverse list of materials including:

  • Aluminum
  • Brass
  • Copper
  • Exotic Metals
  • Molybdenum
  • Titanium
  • Tungsten
  • Carbide
  • Tool Steels
  • A-2, A-5, A-6, A-8
  • D-2, D-3, D-5
  • DC-53
  • H-11, H-12, H-13, H-19
  • L-6
  • M-1, M-2, M-3, M-4, M-42
  • O-1, O-6
  • S-1, S-7
  • T-1


Sinker EDM Form Control Using Closed-Loop Manufacturing

With Smart Manufacturing, state-of-the-art machining centers matched with 3D measurement technologies allow for self-optimized performance through high resolution, non-contact 3D metrology, fully integrated into a precision machine tool. This innovative processing method eliminates clamping errors and offers a distinct increase in machining accuracy.

Sinker EDM Depth Control Using Closed-Loop Manufacturing

EDM Department utilizes Closed-Loop Manufacturing technologies to control the form shape and depth of features in the precision components that we manufacture. This allows for extreme accuracy and automated quality assurance on any sized project.

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