The types used in current power, control and flexible-cable plants are tubular, rigid-frame, planetary, skip\/bow, single-twist, double-twist buncher, concentric high-speed and drum-twister laying-up lines.<\/p>\n\n\n\n A cable stranding machine twists multiple wires or insulated cores into one conductor or cable core under controlled lay length, tension and closing-die geometry.<\/p>\n\n\n\n It is the process step between drawn\/annealed wire and insulation or armoring. For bare conductors the output is judged against IEC 60228:2023 (EN IEC 60228:2024) conductor class, wire count and 20 \u00b0C DC resistance; for overhead bare metal it is judged against IEC 61089 and ASTM B8 \/ B231 \/ B232 \/ B399.<\/p>\n\n\n\n Three geometric results matter on the shop floor:<\/p>\n\n\n\n If the finished cable needs a true circular Class 2 core for MV XLPE, a buncher is the wrong machine even if it is faster.<\/p>\n\n\n\n Back-twist is the single design fact that separates the four rotating-cage families.<\/p>\n\n\n\n Class 2 circular and compacted conductors in IEC 60228:2023 are produced on tubular stranders for 7- and 19-wire sizes, and on rigid-frame or concentric stranders for 37-, 61- and 91-wire and shaped cores.<\/p>\n\n\n\n IEC 60228 Class 2 requires a minimum number of wires by nominal mm\u00b2, equal nominal wire diameter in a conductor, and a maximum DC resistance at 20 \u00b0C. Compacted circular copper starts from 1.5 mm\u00b2; compacted or shaped aluminum starts from 10 mm\u00b2; shaped conductors start from 25 mm\u00b2.<\/p>\n\n\n\n Practical split used by MV\/HV plants:<\/p>\n\n\n\n A double-twist buncher can make a flexible conductor of the same mm\u00b2, but that conductor is Class 5\/6 geometry. It will not pass a Class 2 concentric inspection or a compacting-diameter window specified for XLPE insulation wall.<\/p>\n\n\n\n Use a double-twist buncher when the conductor must be flexible (IEC 60228 Class 5 or 6) and the wires may sit in random positions. Use a concentric\/tubular\/rigid line when layer geometry and diameter must be locked.<\/p>\n\n\n\n A double-twist bow applies two twists per revolution, so linear output is roughly twice a single-twist machine at the same bow RPM. Typical window: individual wire 0.05\u20131.20 mm, finished 0.05\u201316 mm\u00b2, line up to about 200\u2013300 m\/min on fine Cu, take-up 500\u20131250 mm. Automotive ISO 6722, UL building wire and IEC flexible cords are the volume products.<\/p>\n\n\n\n A single-twist machine applies one twist per revolution. It is slower on fine wire, but it accepts larger take-up reels and is the correct tool when you are laying insulated cores, not bunching bare fine wire \u2014 control cable, instrument pairs, some MV cores before taping.<\/p>\n\n\n\n Do not specify a buncher for:<\/p>\n\n\n\n Those products fail on diameter, fill factor or layer direction, not on \u201ctwist quality.\u201d<\/p>\n\n\n\n Skip\/bow, drum-twister and concentric machines cover jobs the four main cages cannot do efficiently: heavy stationary reels, finished multi-core cables, and very high-speed large-section concentric layers.<\/p>\n\n\n\n Skip \/ bow strander<\/a>.<\/strong> Stationary payoffs, rotating bow. Typical 1+3, 1+4, 1+6 for PVC control and rubber mining cable. Advantage is reel mass: a 1250 mm core reel does not have to spin inside a tube. Limit is bare-wire tension uniformity at high RPM; bows fatigue if balance is poor.<\/p>\n\n\n\n![\"\"](\"https:\/\/doingcable.com\/wp-content\/uploads\/2026\/09\/Tubular-Stranding-Production-Line-doingcable.webp\")
<\/figure>\n\n\n\nWhat is a kablo b\u00fckme makinesi<\/strong><\/a> and what does it actually produce?<\/h2>\n\n\n\n
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How do tubular, rigid, planetary and skip stranders differ in back-twist?<\/h2>\n\n\n\n
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Parametre<\/th> Tubular<\/th> Planetary<\/th> Rigid frame<\/th> Skip \/ bow<\/th><\/tr><\/thead> Geri b\u00fck\u00fclme<\/td> True 100%<\/td> Variable 0\u2013100%<\/td> Genellikle 0%<\/td> K\u0131smi<\/td><\/tr> Typical rotor \/ cage<\/td> 400\u20131.200 dev\/dak<\/td> 200\u2013600 dev\/dk<\/td> 80\u2013300 rpm<\/td> 150\u2013600 rpm (bow)<\/td><\/tr> Typical line speed<\/td> 80\u2013230 m\/min<\/td> 50\u2013120 m\/dak<\/td> 20\u201380 m\/min<\/td> 20\u201380 m\/min<\/td><\/tr> Best conductor<\/td> 1.5\u201395 mm\u00b2 Class 2, steel rope<\/td> Fine\u2013medium, OPGW, insulated<\/td> 35\u20131,200 mm\u00b2, ACSR, sector<\/td> Insulated cores, 1+3\/1+4<\/td><\/tr> Compaction<\/td> \u0130yi<\/td> Very good<\/td> Excellent with dies\/rollers<\/td> S\u0131n\u0131rl\u0131<\/td><\/tr> Bobbin<\/td> PN400\u2013630 inside tube<\/td> PN400\u2013800 in cradles<\/td> PND500\u2013800 shaftless<\/td> Large stationary<\/td><\/tr> Failure if misapplied<\/td> Limited max mm\u00b2<\/td> Gear wear, lower km\/h<\/td> Birdcage on hard wire without pre-form<\/td> Lay scatter on fine bare Cu<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n ![\"\"](\"https:\/\/doingcable.com\/wp-content\/uploads\/2026\/09\/Rigid-cage-strander-vs-double-twist-stranders-doingcable.webp\")
<\/figure>\n\n\n\nWhich stranding machine is used for Class 2 power conductors?<\/h2>\n\n\n\n
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When should a plant use a double-twist buncher instead of a concentric strander?<\/h2>\n\n\n\n
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![\"\"](\"https:\/\/doingcable.com\/wp-content\/uploads\/2026\/09\/630-Double-Twist-Bunching-Machine-for-copper-wire-making-machine-doingcable.avif\")
<\/figure>\n\n\n\nWhat are skip stranders, drum twisters and concentric stranders used for?<\/h2>\n\n\n\n
![\"\"](\"https:\/\/doingcable.com\/wp-content\/uploads\/2026\/09\/Bow-Skip-Stranding-and-Laying-up-production-line-doingcable-1067x800.webp\")
<\/figure>\n\n\n\n