Sinker EDM Services
Whether you need precision cavities burned into hardened tool steel or secondary features added to finished components, EDM of Garland is here to help. With dedicated sinker equipment, in-house electrode production, and 40+ years serving DFW manufacturers, our team delivers the accuracy your project demands.
Struggling With Precision Cavity Work?
If you’re sourcing sinker EDM services in Dallas, you’ve probably run into these frustrations:- Most local shops only do wire EDM and keep referring you elsewhere for cavity work
- Your mold cores require blind features that conventional machining can’t touch
- Heat-treated tool steels are destroying your cutters and blowing your timelines
- Electrode outsourcing adds weeks and quality uncertainty to your projects
- You need sharp internal corners not the radiused compromises wire EDM forces
- Secondary operations on finished parts risk scrapping expensive pre-machined components
What is Sinker EDM?
Sinker EDM (also called Ram EDM or Plunge EDM) uses a custom-shaped electrode to erode cavities and 3D features into conductive materials through controlled electrical sparks. The process happens in dielectric oil with zero mechanical stress, allowing you to machine hardened materials and finished parts without risk of distortion. Key difference from wire EDM: Sinker creates features that stop inside the part. Wire EDM cuts completely through. The geometry determines which process you need.What Sinker EDM Makes Possible
Machine Hardened Materials After Heat Treatment Stop scheduling EDM before hardening. We burn cavities, ribs, and internal details into H-13, D-2, S-7, and tungsten carbide at full hardness. No annealing required, no re-hardening delays. Create Features Conventional Machining Can’t Sharp internal corners down to near-zero radius. Deep ribs with aspect ratios that break end mills. Blind keyways and splines without through-features. Complex cooling channels in injection mold cores. Add Features to Finished Parts Without Risk Burn blind keyways, internal splines, or relief pockets into expensive pre-machined components. Zero mechanical stress means no distortion and no scrap risk on parts with $10,000+ of prior machining invested.CALL (972) 271-9028 TO GET A QUOTE TODAY
Our Sinker EDM Capabilities
Mold and Die Work
Injection mold cores, cavity inserts, stamping dies, and precision tooling in hardened tool steels. Complex rib structures, cooling channels, textured surfaces, and features that define final molded part quality.Secondary Operations
Blind keyways, internal splines, relief pockets, and detail features added to existing components. We work on finished parts without introducing mechanical stress that causes distortion or scrap.Hard and Exotic Materials
Tungsten carbide die inserts. Inconel and Hastelloy for oil and gas. Titanium for aerospace tooling. We specialize in materials that punish conventional machining.Materials We Machine
Any electrically conductive material: Aluminum, Brass, Copper, Hastelloy, Inconel, Molybdenum, Stainless Steels, Titanium, Tool Steels (A2, D2, H13, M2, O1, S7), Tungsten Carbide.Trusted by DFW Manufacturers Since 1984
40+ years serving Dallas-Fort Worth tool & die makers, aerospace suppliers, and oil & gas manufacturers. Family-owned and operated in Garland, Texas. Industries we serve: Tool & Die Manufacturing, Aerospace & Defense, Oil & Gas Equipment, Medical Device, Automotive, ElectronicsIs Sinker EDM Right for Your Project?
Choose Sinker EDM When You Need:- Blind cavities, pockets, or features that don’t cut through the part
- Mold cores and cavity inserts in hardened tool steel
- Sharp internal corners (near-zero radius vs. wire EDM’s 0.006″+ minimum)
- 3D contoured surfaces and complex geometries
- Secondary operations on finished, expensive components
- Through-cuts and profiles that go completely through material
- Punches, dies, and flat profiles
- One-off prototype work (no electrode investment)
- Wire EDM Services
- Sinker EDM Services
- CNC Machining Services
- Plasma Cutting Services
- Welding Services
- Services Overview
- Industries We Serve
Why EDM of Garland?
Dedicated Sinker Capability in DFW
Most local EDM shops only offer wire. We’re one of the few in Dallas-Fort Worth with dedicated sinker machines for the cavity work, mold cores, and blind features that wire EDM can’t produce.
Electrodes Made In-House
We machine our own graphite and copper electrodes. No outsourcing delays, no quality uncertainty, no finger-pointing. Faster turnaround and better accuracy on your parts.
40+ Years in Garland
Founded in 1984. Family-owned. Serving DFW tool & die makers, aerospace manufacturers, and oil & gas suppliers for over four decades. We’re not going anywhere.
Get a Wire EDM Quote
EDM of Garland delivers precision sinker EDM for molds, dies, and cavity work that conventional machining can’t handle. One of the few DFW shops with dedicated sinker capability, in-house electrodes, and 40+ years of experience.
Ready to discuss your project?
Send your specs to [email protected] — we’ll review your requirements and provide a quote with clear pricing and realistic lead times.
Located in Garland, Texas — serving Dallas, Fort Worth, Plano, Richardson, Mesquite, and manufacturers throughout DFW.
Frequently Asked Questions
What is sinker EDM used for?
Sinker EDM creates blind cavities, 3D features, and complex shapes in hardened materials. Common applications include injection mold cores, stamping die cavities, blind keyways, and secondary operations on finished parts.
What’s the difference between sinker EDM and wire EDM?
Sinker plunges a shaped electrode into material to create cavities. Wire cuts completely through like a scroll saw. Choose sinker for blind holes and internal features; choose wire for through-cuts and profiles.
What surface finish can sinker EDM achieve?
We produce finishes from 32 Ra µin down to 8 Ra µin depending on requirements. Many customers use our EDM finish directly without secondary polishing.
How are sinker EDM electrodes made?
We machine electrodes in-house from graphite or copper. Graphite works well for most tool steels; copper produces finer finishes on carbide. Electrode cost is factored into job pricing.
Can sinker EDM create sharp internal corners?
Yes. Sinker creates near-zero radius internal corners with properly shaped electrodes. Wire EDM minimum radius is typically 0.006″ to 0.008″ with standard wire.
What files do you need to quote a job?
We accept STEP, IGES, DXF, DWG, and PDF files. We can also work from physical parts. For accurate quotes, we need geometry, material, tolerances, surface finish, and quantity.