Cantilever Single Stranding

-- Steady & Reliable Manufacturer --

Introduction

Cantilever single stranding machines are a core piece of equipment in modern wire and cable manufacturing. Unlike tubular or planetary stranders, this design features a cantilevered bobbin holder — meaning the pay-off reel is supported on one end only, making spool changes fast, tool-free, and operator-friendly. This structural choice directly translates to shorter changeover times and lower downtime on the production floor.

These machines are commonly used to strand fine to medium-gauge conductors, including copper, aluminum, and alloy wires. The single-twist mechanism applies consistent lay length throughout the stranding run, ensuring stable electrical performance and mechanical integrity in the finished cable.

Whether you're producing automotive wiring, signal cables, or building wire, cantilever single stranding machines offer a reliable, space-efficient solution that balances performance with ease of operation. Their relatively compact footprint makes them well-suited for facilities where floor space is at a premium, while their robust frame construction supports continuous high-volume production.

Specification

Wire Diameter Range	0.05 mm – 2.5 mm
Number of Bobbins	7 / 12 / 19 / 24 / 37
Bobbin Size	PN 100 / PN 160 / PN 250
Stranding Pitch	3 mm – 100 mm (adjustable)
Max Bow Speed	Up to 3,000 RPM
Lay Direction	S / Z (selectable)
Drive System	AC servo motor + gearbox
Control System	PLC with HMI touchscreen
Take-up Spool Diameter	Up to PN 630
Power Supply	380V / 50Hz (customizable)
Machine Dimensions (approx.)	3,500 × 900 × 1,400 mm
Weight	Approx. 1,800 kg

Applications

Cantilever single stranding machines are used across a wide range of wire and cable production applications. Their versatility and compact design make them a practical fit in multiple industries.

Automotive wiring harnesses: Stranding fine copper conductors for vehicle sensor lines, data cables, and power distribution wiring that require precise geometry and consistent lay length.
Building and construction wire: Manufacturing stranded conductors for residential and commercial electrical installations, including NYM, H07V-R, and equivalent cable types.
Instrumentation and control cables: Producing multi-strand conductors used in industrial automation, PLC systems, and fieldbus communication cables.
LAN and data cables: Stranding individual pairs or conductors for Cat5e, Cat6, and similar structured cabling applications.
Medical device cables: Low-pitch, fine-gauge stranding for flexible, biocompatible cable assemblies used in diagnostic and monitoring equipment.
Aerospace and defense cables: High-precision stranding for mil-spec wire and lightweight cable harnesses where dimensional tolerance is critical.

Advantages

Rapid bobbin changeover: The cantilever design allows operators to swap out reels from one side without dismantling the machine frame — dramatically reducing setup time between production runs.
Consistent stranding quality: Precision tension control and servo-driven bow mechanisms ensure uniform lay length and stable conductor geometry from start to finish of every spool.
Space-efficient layout: The compact footprint makes them easier to integrate into existing production lines, especially in facilities with limited floor space.
Low maintenance requirements: Simplified mechanical structure with fewer rotating assemblies means reduced wear parts and longer service intervals compared to planetary designs.
Operator-friendly interface: PLC touchscreen controls allow easy parameter input, real-time monitoring, and fault diagnostics — reducing the skill barrier for line operators.
Flexible configuration: Available with different bobbin counts and sizes to accommodate a range of conductor configurations and production volumes.

Material and Structure

The structural integrity of cantilever single stranding machines begins with the main frame, which is typically manufactured from heavy-duty welded steel or high-quality cast iron. This provides the rigidity needed to minimize vibration during high-speed operation — a critical factor in maintaining consistent lay length and wire geometry.

The cantilever arm and bobbin holder are machined from alloy steel and surface-treated to resist corrosion and mechanical wear. Bobbin pins are precision-ground to ensure repeatable spool positioning and minimal runout during rotation.

Tension rollers and wire guides are fitted with ceramic inserts or hard chrome plating to prevent surface damage to fine conductors, especially when processing bare or lightly coated copper and aluminum wires.

The drive system integrates AC servo motors paired with precision gearboxes, offering smooth acceleration and deceleration profiles. The take-up section uses a programmable traverse mechanism to ensure even layer winding on the output bobbin.

Electrical cabinets are built to IP54 or higher, suitable for the typical industrial environment of a wire drawing or cable production facility.

Installation Tips

Foundation and leveling: Install on a reinforced concrete floor with anti-vibration pads. Use a precision level to ensure the machine base is within ±0.5 mm over its full length before anchoring.
Power connection: Verify local supply matches the rated voltage (typically 380V/3-phase/50Hz). Ensure a dedicated grounding conductor is connected to the machine chassis.
Bobbin loading sequence: Load bobbins onto the cantilever pins following the thread path diagram in the manual. Ensure each bobbin rotates freely without lateral wobble before threading wire.
Wire threading: Thread conductors through the guide rollers and tension units in the correct sequence. Maintain consistent tension settings across all positions to avoid uneven lay during start-up.
Initial parameter setup: Enter the required stranding pitch, lay direction, and line speed into the HMI before the first run. Run a short test spool and measure the actual lay length against the target to confirm calibration.
Safety checks: Confirm all safety guards are in place and emergency stop buttons are functional before live operation. Lubricate per the maintenance schedule.

Comparison with Similar Equipment

Feature	Cantilever Single Stranding	Tubular Stranding Machine	Planetary Stranding Machine
Bobbin changeover	Fast (one-side access)	Moderate	Slow (complex disassembly)
Structural complexity	Low to medium	Medium	High
Wire range	Fine to medium gauge	Medium to heavy gauge	Heavy / large-core cables
Footprint	Compact	Medium to large	Large
Capital cost	Lower	Medium	Higher
Lay length precision	High	High	Very high
Suitable for fine wire	Yes	Limited	Not typical
Maintenance frequency	Low	Medium	High

For fine to medium conductor applications where quick changeover and space efficiency matter most, cantilever single stranding machines offer a clear practical advantage over tubular and planetary alternatives. Their lower complexity also reduces total cost of ownership significantly over a 5–10 year service life.

Frequently Asked Questions

Q: What wire diameter range can this machine handle?
A: Most cantilever single stranding machines are designed for conductor diameters between 0.05 mm and 2.5 mm. Always check the equipment nameplate and confirm with your supplier if working at the upper or lower limit of this range.

Q: Can the machine strand aluminum wire as well as copper?
A: Yes. With appropriate tension settings and compatible wire guide materials, cantilever stranders can process both bare copper and aluminum conductors. Some machines also handle tinned or silver-plated copper wire without modification.

Q: How is the stranding pitch adjusted?
A: The pitch is typically set via the PLC interface by entering the target lay length in millimeters. The machine calculates and adjusts the ratio between bow speed and line speed automatically. Manual gear-change systems are available on older models.

Q: How long does a bobbin changeover take?
A: An experienced operator can typically complete a bobbin swap in 3–8 minutes per position on a cantilever machine, compared to significantly longer times on tubular designs requiring full disassembly.

Q: What maintenance does the machine require?
A: Routine maintenance includes periodic lubrication of bearings and gearboxes, inspection of tension rollers and ceramic guides for wear, and checking servo motor parameters. A full preventive maintenance schedule is provided in the equipment manual.

Q: Is custom configuration available for bobbin count or size?
A: Yes. Most manufacturers offer configuration options including different bobbin counts (7, 12, 19, 24, 37) and bobbin sizes. Custom lay direction and take-up bobbin size options are also commonly available.