The corner your print asks for
When a drawing calls for a sharp internal corner, the wire decides whether it can exist. A wire EDM leaves an internal radius of about half the wire diameter. Most shops in Mexico run 0.18 to 0.25 mm wire, so the sharpest corner they can deliver is a 0.09 to 0.13 mm radius. Our 2026 machine runs 0.13 mm molybdenum wire and holds radii near 0.07 mm. If your insert, punch or die needs corners that sharp, this is the machine it needs.
No force, no heat damage, no hardness limit
EDM cuts with controlled electrical sparks, not contact. The part feels no cutting force, so thin walls don't deflect and finished geometry doesn't move. Hardness stops being a constraint: we routinely cut D2 and H13 at HRC 60 to 65 after heat treatment, which is exactly the order of operations a hardened part wants.
Numbers that matter
| Spec | Typical market | RIC |
|---|---|---|
| Wire diameter | 0.18 to 0.25 mm | 0.13 mm |
| Internal corner radius | ≈ 0.09 to 0.13 mm | ≈ 0.07 mm |
| Tolerance | ±0.01 mm | ±0.005 to ±0.010 mm |
| Finish | Ra 1.6 µm | Ra 0.8 µm |
| Hardness | Limited by tooling | To HRC 65, no limit from the spark |
Where it fits in your part
Wire EDM doesn't replace CNC machining; it finishes what milling can't. We rough the part soft, heat treat it in house, then cut the critical profiles by wire on the hardened blank. One plant, one sequence, no freight between vendors. We wrote more about the geometry in when sharp internal corners matter.
Why does wire diameter matter?
The wire sets the smallest internal corner you can cut. A corner radius is roughly half the wire diameter. Our 0.13 mm wire leaves radii near 0.07 mm; the 0.18 to 0.25 mm wire most shops run cannot get there.
Can you cut hardened material?
Yes, that is the point of EDM. The spark does not care about hardness, so we cut tool steels at HRC 60 to 65, carbide and Inconel after heat treatment, with no induced stress.
What tolerances and finishes do you hold?
Tolerances from ±0.005 to ±0.010 mm and finishes to Ra 0.8 µm straight off the machine, with no secondary polishing.
What parts is wire EDM right for?
Punches, dies, mold inserts, keyways, splines and any through profile with sharp internal corners, thin walls or hardened material that a cutter would deflect or burn through tooling on.