Process
2D CNC wire forming
Every bend in one plane. Same CNC feed-and-bend logic as 3D, without the rotary axis that takes the centerline out of plane. The right cell when the part can lie on a surface plate.
What 2D CNC wire forming is
A 2D CNC program feeds wire, bends it around pins or a rotary tool, and cuts it — with all bend planes coincident. The part can be laid on a surface plate or an optical comparator. Think flattened clips, links, planar S-hooks, retaining rings that are still “flat,” appliance and display wires, and many guard outlines.
2D is not a lesser process. It is the correct process when the mating assembly only needs a planar form. Prove-out is faster, inspection is cheaper, and tool collisions are easier to see.
How the cell runs
Same family as 3D CNC: coil, straighten, feed, bend, cut. No torsion axis. That sounds like a missing feature. On a planar frame it is a deleted collision.
Ends, welds, and finish are still secondaries. A 2D outline that closes into a rectangle is often formed open and resistance welded, not forced through a fully closed path.
When 2D is the right call
- The print’s bends share one datum plane.
- Volume is prototype through mid production and the geometry may still change — CNC beats a fourslide tool.
- You need a 3D-looking part that is actually a 2D form plus one simple kick. Sometimes that kick is still a 2D program with a fixture bend; sometimes it is a short 3D program. That is a process call, not a CAD call.
If the wire has to route around a motor, through a housing, or clear a harness in space, use 3D.
What changes from 4 to 14 mm
| Diameter | Inch | 2D CNC |
|---|---|---|
| 4 mm | 0.157 in | Fast programs, overlay inspection. Min legs still apply — do not pack clip-style zigzags. |
| 8 mm | 0.315 in | Typical guard and rack outlines. Weld closures are common. |
| 12 mm | 0.472 in | Heavy planar frames. Inside radius ≥ 1× diameter on mild carbon. |
| 14 mm | 0.551 in | Structural 2D. Treat legs and radii like fabrication, not like a paperclip. |
2D CNC vs 3D vs fourslide
| Lane | When it wins |
|---|---|
| 2D CNC | Planar part, revisions, prototype through mid volume |
| 3D CNC | Out-of-plane routing, hooks, spatial frames |
| Fourslide | Frozen high-volume 2D, usually well under 4 mm |
Design notes specific to 2D
Bend radius, min leg, and springback rules are the same family as 3D — see the design guide. The extra constraint is stacking: a 2D clip with many reversing bends can still collide with tooling even though it is planar. Leave real straights between reversals, or expect a slower program.
Inspection should be an overlay or a hard fixture to the mating hole pattern — not a chain of ±0.005 in on every leg. Put the tolerance on the interface. Inspection is its own page.
Related processes
- Wire form shapes — L, U, J, S, serpentine, cut-to-length
- 3D CNC wire forming — out-of-plane bends
- Fourslide — frozen high-volume 2D
- Heavy wire, 4–14 mm
- Wire forming in the USA