How a Camless Spring Machine Cuts Setup Time by 50% (And Why Your Setup Master Prefers It)

The Setup Time Problem Nobody Talks About

Walk into any spring manufacturing shop during a product changeover, and you will see the same scene: a setup master hunched over a cam drum, reaching for feeler gauges, swapping cam plates, and nudging a follower roller by fractions of a millimeter. On a conventional cam-type machine, a simple changeover from a compression spring to a torsion spring can eat 90 to 180 minutes. Multiply that across three or four changeovers per shift, and you are looking at 5 to 8 hours of non-productive machine time every week, per machine.

This is exactly why camless spring forming technology has moved from "experimental" to "default choice" for high-mix spring producers. In this article, I will walk through the actual mechanical differences, share real production data from a Vietnamese customer who runs our HSM-CNC20, and give you a side-by-side parameter comparison so you can decide whether the upgrade makes sense for your shop.

Cam vs Camless: What Actually Changes Mechanically

The short version: a cam spring machine uses mechanical cam plates (the "cam") to dictate the motion path of each slide. A camless spring machine uses independent servo motors on every axis, coordinated by software.

That single difference cascades through everything you care about:

• Setup time: Cam changes require physical swap of plates and mechanical adjustment. Camless requires only program changes on the HMI.

• Shape complexity: Cam machines are limited to motion paths that can be machined into a flat plate. Camless machines can produce shapes that are physically impossible to cam, including 3D wire forms.

• Repeatability: Mechanical cams wear. After 18 to 24 months of heavy production, cam profile accuracy drifts, and so do your spring dimensions.

• Tooling inventory cost: A cam shop often stocks 30, 40, even 50 cam plates for different parts. A camless shop stocks only wire guides and quill tooling.

Real Production Data: 8 Months With the HSM-CNC20

One of our long-standing customers in Vietnam has been running two HSM-CNC20 cam spring machines since 2010. In 2024, they added a third HSM-CNC20 and benchmarked it against their older cam-based setup. Here is what their setup master reported after 8 months:

• Daily output increased by 35% on equivalent part mixes

• Dimensional tolerance held at ±0.01mm across the entire 8-month window with no drift

• Average setup time for a new part dropped from 110 minutes (cam) to 42 minutes (camless) - a 62% reduction

• Tooling changeover reduced from about 25 minutes to under 4 minutes

The setup master's exact words, translated: "I used to spend my morning fighting the machine. Now I spend it making springs."

Dongzheng Spring Machine Product Line at a Glance

To help you match wire diameter and part complexity to the right machine, here is a parameter snapshot of our current 8-model CNC line:

Model	Type	Wire Diameter (mm)	Axis Count	Typical Application
HSM-CNC08	Cam Spring Coiling	0.08 - 1.0	2	Micro-springs, electronics
HSM-CNC20	Cam Spring Coiling	0.2 - 2.0	2-3	General precision springs
HSM-CNC30	Cam Spring Coiling	0.8 - 3.0	2-3	Medium-duty compression springs
HSM-CNC40	Cam Spring Coiling	1.8 - 4.5	3-4	Heavy-duty torsion, garage door
HSM-CNC60	Cam Spring Coiling	2.0 - 6.0	3-4	Large industrial springs
HSM-CNC1008	Camless Spring Forming	0.1 - 1.0	4-5	3D wire forms, micro parts
HSM-CNC1025	Camless Spring Forming	0.2 - 2.5	5-8	Complex 3D bending
HSM-CNC1045	Camless + Wire Rotary	1.8 - 4.5	8-12	Automotive seat frames, heavy 3D

The flagship HSM-CNC20 has now shipped 100+ units globally and is running in 15+ countries outside China. Vietnam alone accounts for 40+ units, Brazil 10+, with Indonesia and Korea each above 5.

Why This Matters for Your Procurement Decision

If you are evaluating an advanced technology CNC spring coiling machine with excellent customer service, the machine itself is only half the equation. The other half is what happens after the invoice is paid.

Here is a data point from Brazil that we share openly: a customer purchased two HSM-CNC20 units in 2022. To date, in 2026, they have never activated the WeChat-based technical service group we set up for them. Zero service tickets. The machines simply keep running.

This is not luck. It is the result of three design choices we made early on:

• Japanese-brand servo motors and bearings as standard (not optional)

• Windows-based CNC controller with a familiar interface, so setup masters from other brands adapt in under a week

• Modular electrical cabinets that any local electrician can diagnose with the wiring diagram we ship in the crate

For shops running copper wire wire making machinery with excellent quality equipment standards, these design choices translate directly into higher OEE and lower lifetime service cost.

When Camless Is Not the Right Answer

I want to be honest here. Camless is not always better. If your shop runs one part, in high volume, for years on end, a well-tuned cam machine can still beat a camless machine on raw cycle time and unit cost. The camless advantage lives in flexibility, complexity, and changeover speed.

So the right question is not "cam or camless" but "how many part numbers do I run per month, and how often do they change?" If the answer is more than 15 to 20 part numbers, or if you need a 3D CNC wire bending machine for automotive or furniture hardware, camless pays back the premium in 12 to 18 months on setup labor alone.

The Setup Time Math You Can Run Yourself

Before you talk to any supplier, run this calculation:

• Number of changeovers per shift

• Average changeover time on your current machine (in minutes)

• Average hourly margin per machine

If your changeover time exceeds 60 minutes and you have two or more changeovers per shift, the upgrade math almost always works. If you are running a dedicated single-part line 24/7, keep your cam machine and spend the budget on a second one instead.

What Setup Masters Actually Care About

We hear this directly from customers. A Shenzhen buyer who added two HSM-CNC20 units plus an HSM-CNC08 in early 2026 told us their setup master - who has run machines from at least four different brands at previous shops - specifically requested our machines. His reason: stable, durable, easy to adjust. That is the voice that matters in any shop, because the setup master decides whether a machine lives or dies on the floor.

Closing Question for Your Shop

So here is what I would like to ask you: in your current operation, how many hours per week does each spring machine sit idle during changeovers, and what would a 50% reduction in that idle time mean for your monthly output? If you have tracked the number, drop it in the comments - I read every one and will reply with what our customers in similar situations typically see after the switch.