CNC Spring Machine Buying Guide: Cam vs Camless, Wire Diameter 0.08–6.0mm

Why Machine Selection Matters More Than Spec Sheets

If you have ever walked a spring production floor, you know the truth: a wrong machine choice costs more in 18 months than the price difference on day one. I have seen factories in Vietnam and Brazil buy cheaper camless spring machines, then retrofit them within two years because wire diameter stability on 3mm wire was drifting past ±0.02mm.

Dongzheng Spring Machine has shipped 150+ CNC spring machines outside China since 2004, serving 15+ countries. The data below comes from real field reports, not brochures.

Two Technology Paths: Cam and Camless

Cam Spring Machines (HSM-CNC20 / 30 / 40 / 60)

A cam spring machine uses mechanical cams to control the feeding pitch, cutting, and forming axes. The advantage is rigidity under load. When you coil 2.0–6.0mm wire at high speed, the cam mechanism absorbs springback forces that would flex a servo-only system.

The flagship HSM-CNC20 handles 0.2–4.0mm wire and has 100+ units running globally. It is the workhorse for belleville spring (disc spring) production, where consistent stack height and load curves depend on repeatable pitch accuracy.

Camless Spring Machines (HSM-CNC1008 / 1025 / 1045)

Camless machines rely entirely on servo control. This gives you:

• Faster setup changes (no cam grinding)

• More complex 3D shapes

• Lower noise on small wire (0.1–1.0mm)

The HSM-CNC1045 camless spring machine with wire rotary function extends this technology to 1.8–4.5mm wire, a range previously dominated by cam machines.

Full Lineup Comparison

Model	Wire Diameter (mm)	Type	Key Feature	Typical Application
HSM-CNC08	0.08–1.0	Cam Spring Coiling	Micro wire precision	Electronics, micro springs
HSM-CNC20	0.2–2.0 (up to 4.0)	Cam Spring	Global bestseller, 100+ units	Belleville spring, general
HSM-CNC30	0.8–3.0	Cam Spring Coiling	Medium range	Automotive valve springs
HSM-CNC40	1.8–4.5	Cam Spring	Heavy wire stability	Industrial compression springs
HSM-CNC60	2.0–6.0	Cam Spring	Available with/without wire rotary	Heavy-duty coil forming
HSM-CNC1008	0.1–1.0	Camless Spring	Servo-only, complex shapes	Electronic contact springs
HSM-CNC1025	0.2–2.5	Camless Spring	Fast changeover	Precision torsion springs
HSM-CNC1045	1.8–4.5	Camless with wire rotary	Camless + rotary forming	3D heavy wire shapes

For a 2/3/4mm cnc wire coiling machine for belleville spring product, the HSM-CNC20 is the proven choice. For wire below 1.0mm where shape complexity matters more than tonnage, the camless series wins.

Real Factory Data, Not Marketing Copy

Vietnam customer (2010–present): Running HSM-CNC20 on belleville spring production. After 8 months on the machine, daily output increased 35% compared to their previous setup. Wire diameter tolerance has held at ±0.01mm continuously for over a decade. The machine is still in production.

Brazil customer (2022): Purchased 2 units of HSM-CNC20. The customer has never activated the WeChat maintenance group. Zero service calls, zero spare part replacements, four years running. That is what factory direct sales spring machine should look like: ship it, and it works.

Shenzhen customer (2026): Bought 2 HSM-CNC20 and 1 HSM-CNC08. The setup technician told us directly: he had used many brands at previous factories, and Dongzheng machines are his favorite because they are stable, durable, and easy to set up. A machine that operators actually like is a machine that produces good parts.

Vietnam customer (March 2026): Saw our machine at a competitor's factory. Compared the running stability with his own recently purchased unit, immediately ordered one HSM-CNC20. The competitor's machine was not bad; it was just not as steady.

When to Choose Cam vs Camless

Choose cam type when:

• Wire is 2.0mm or above

• Running the same part for long production runs

• Tolerance requirement is ±0.01mm or tighter

• Application is belleville spring, valve spring, heavy compression spring

Choose camless type when:

• Wire is below 2.0mm and shapes are complex

• Changeover frequency is high (more than 3 part numbers per day)

• 3D forming with wire rotation is required

• Noise and floor space matter (camless is quieter)

What "Factory Direct Sales" Actually Means

Most spring machine buyers in Southeast Asia and South America pay a 15–25% distributor markup. Dongzheng sells factory direct, with annual capacity above 150 sets. Vietnam alone has 40+ units in operation, Brazil 10+, Indonesia and Korea 5+ each. When you buy direct, the engineer who built your machine is the same person on the WeChat group answering your setup question at 11pm.

Closing Question

If you are running 2–4mm wire for belleville springs today, what is the biggest pain point: setup time, wire diameter drift, or operator skill dependency? I would like to hear how different factories solve the same problem differently.

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