Cam vs Camless Spring Machine: Specs Comparison

Choosing between a cam and camless spring former machine usually comes down to wire diameter, batch size, and how much flexibility you need in your tooling setup. Here is a practical, data-driven comparison based on the CNC spring coiling machine range we have shipped to over 15 countries since 2004.

Why This Question Comes Up So Often

Buyers searching for a spring former machine company or a computer cnc torsion spring coiling machine supplier typically already know they need automation. The harder question is whether to invest in cam-based mechanics or a fully camless servo platform.

In short:

• Cam machines are faster, cheaper to buy, and ideal for high-volume runs of identical springs.

• Camless machines are slower per cycle but eliminate mechanical cam changeover, which is where most downtime comes from in practice.

Below we break down both options using the HSM-CNC series specifications we manufacture at Dongzheng.

The Two Design Philosophies

A cam spring machine uses a mechanical cam (a shaped disc) to drive the feeding pitch and cutting action. You physically swap cams when you change spring geometry. A camless spring machine replaces those cams with independently controlled servo axes, so every parameter is software-driven.

This fundamental choice affects everything from part-change time to the kind of springs you can realistically run.

Specification Comparison Table

Model	Type	Wire Diameter	Key Feature
HSM-CNC08	Cam	0.08 – 1.0 mm	Micro-spring coiling for electronics and medical
HSM-CNC20	Cam	0.2 – 2.0 mm	Flagship model, 100+ units running globally
HSM-CNC30	Cam	0.8 – 3.0 mm	Medium-range production
HSM-CNC40	Cam	1.8 – 4.5 mm	Torsion and heavy-duty compression springs
HSM-CNC60	Cam	2.0 – 6.0 mm	Available with or without wire rotary
HSM-CNC1008	Camless	0.1 – 1.0 mm	Tool-free setup for small precision springs
HSM-CNC1025	Camless	0.2 – 2.5 mm	Mid-range camless platform
HSM-CNC1045	Camless	1.8 – 4.5 mm	Camless with wire rotary capability

When Cam Machines Win

For pure production speed on a fixed part number, the HSM-CNC20 remains our best-selling platform, with 100+ units currently running in 15+ countries. Wire diameter coverage from 0.2 to 4.0 mm covers roughly 80% of the springs most contract manufacturers produce.

Real-world result from Vietnam (customer running the HSM-CNC20 since 2010): daily output improved by 35% within 8 months of installation, with ±0.01mm accuracy holding steady on long runs.

Another Brazilian customer purchased two HSM-CNC20 units in 2022. According to our service records, the customer has never opened a maintenance ticket through our WeChat support group. Zero service calls in over three years.

A Shenzhen customer in 2026 ordered two HSM-CNC20 units plus one HSM-CNC08. The interesting detail: their setup technician had previously worked with machines from several other brands at a previous employer. He specifically requested Dongzheng machines for stability, durability, and ease of adjustment, which is the kind of feedback we hear from operators rather than purchasing managers.

When Camless Machines Win

If your production mix changes daily, or you run small batches of complex torsion springs, cam-based changeover will eat your margins. A camless spring machine lets you switch parts by loading a new program, typically cutting setup time by 50% or more compared to a cam machine requiring physical cam swaps.

A Vietnamese customer in March 2026 purchased one HSM-CNC20 after seeing it running at a competitor's facility. They already owned machines from another brand, but after comparing the HSM's stability against their existing setup, they ordered directly.

This is a common pattern: buyers who first see a camless machine running in production rarely go back to specifying cam machines.

Practical Selection Rules

Use this quick logic when sourcing from a computer cnc torsion spring coiling machine supplier:

• Wire diameter under 0.2 mm or above 4.5 mm: HSM-CNC60 (cam, 6.0 mm max) or HSM-CNC1045 (camless, with wire rotary).

• Single part number, high volume, minimum 8 hours continuous run: HSM-CNC20 or HSM-CNC40.

• More than 20 part changes per week: HSM-CNC1025 camless platform.

• Medical or micro-electronics: HSM-CNC08 (cam) or HSM-CNC1008 (camless).

What Most Buyers Overlook

Repeatability drift on long runs is the most common failure mode in cam machines. Mechanical cams wear, and feeding pitch gradually shifts. We have seen ±0.01mm accuracy hold for months on the HSM-CNC20, but only when the cam tooling is properly maintained. Camless machines do not have this wear pattern because there is no cam.

Servo response time also matters more than raw axis count. A 12-axis camless machine with slow servo tuning is often slower than a well-tuned 5-axis cam machine. When evaluating any spring former machine company, ask to see a live production sample at your wire diameter before signing the PO.

Closing Question

If you currently run cam machines, what is the longest your cam tooling has held ±0.01mm accuracy before requiring replacement? And if you run camless machines, how much real setup time are you saving per part change in your actual production? Drop your numbers in the comments.

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