What wire sizes can a spring coiler make?

Each machine is built for a range, for example 0.2–2 mm (0.0079–0.0787 inch) or 2–8 mm (0.0787–0.315 inch). Workshops often run several machines to cover small and large wire.

Can one machine make all spring types?

Compression springs are the simplest. Extension springs need hook forming and torsion springs need leg forming, which need more axes or extra tools.

Why are springs baked after coiling?

Stress relieving in an oven removes stresses from coiling, so the spring holds its free length and load in use.

Spring coiling machine: CNC axes, wire range, uses

A spring coiling machine feeds wire through rollers and bends it against coiling points to form springs. On a CNC coiler, servo axes set the coil diameter, pitch and length as the spring forms, and a cutter cuts it off at the end. Machines with rotating tools and more axes also form hooks, legs and wire shapes in the same cycle.

Quick facts

Wire range: Each machine covers a range, from about 0.1 mm (0.0039 inch) to over 12 mm (0.472 inch)
Axes: About 2–12 CNC axes
Output: From a few to several hundred springs a minute (small wire)
Makes: Compression, extension, torsion springs and wire forms
Control: CNC with programs stored per spring
After coiling: Stress-relieving oven, end grinder, load tester

Main parts

Wire straightener and feed rollers
Wire guides and coiling points that set the diameter
Pitch tool that opens the coils
Cutter that cuts the finished spring
Rotating tool units for hooks and legs (on multi-axis machines)
Camera or length probe for checking springs in line

Equipment that goes with it

Machine	Job
Stress-relieving oven	Removes coiling stress, fixes the shape
End grinding machine	Grinds compression spring ends flat
Shot peening machine	Improves fatigue life
Spring load tester	Checks load at set lengths

Good to know

Springback depends on the wire batch, so the first springs are checked and the program adjusted
Small-wire coilers are very fast; heavy-wire machines are slower
Torsion springs and wire forms need more axes or rotating tools
Hot coiling is used for very thick wire such as vehicle suspension springs

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Questions

What wire sizes can a spring coiler make?: Each machine is built for a range, for example 0.2–2 mm (0.0079–0.0787 inch) or 2–8 mm (0.0787–0.315 inch). Workshops often run several machines to cover small and large wire.
Can one machine make all spring types?: Compression springs are the simplest. Extension springs need hook forming and torsion springs need leg forming, which need more axes or extra tools.
Why are springs baked after coiling?: Stress relieving in an oven removes stresses from coiling, so the spring holds its free length and load in use.

The figures on this page are typical values for guidance, written by Diemeco from standard engineering practice. They are not a specification: confirm grades and properties with the relevant standard or the supplier's mill test certificate, and tolerances with your workshop. Last checked 22 October 2026.