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Making Rope on a Ropemaking Machine — Twisted Three-Strand Hemp Rope
A rope walk and ropemaking machine turn loose plant fibres into strong, durable rope by twisting multiple strands together in opposite directions. Three bundles of combed hemp fibre are each twisted clockwise (Z-twist) by a cranked machine, while a top (a grooved wooden cone) travels down the rope walk, forcing the three strands to wrap around each other counter-clockwise (S-twist). The opposing twist locks the rope together — it will not unravel under load. This technique scaled up in the age of sail to produce kilometres of rigging for every ship, but the principle works at any scale, from garden twine to hawsers.
中級者
2-3 hours
手順
1
1
Prepare the hemp fibre
Prepare the hemp fibre
Start with retted and broken hemp bast fibre. Comb (hackle) the fibre through a set of steel pins to separate and align the strands, removing short fibres and debris. The result is a smooth, parallel bundle of long fibres called a 'sliver.'
このステップの材料:
Hemp Fibre500 g2
2
Form three yarns
Form three yarns
Divide the combed fibre into three equal bundles. Each bundle will become one strand of the finished rope. For a rope about 10 mm diameter, each bundle should weigh roughly 150-170 g per metre of finished rope.
3
3
Set up the rope walk
Set up the rope walk
A rope walk is a long, straight space — at least twice the desired rope length, as twisting shortens the rope by about 30-40%. Outdoors on a lawn or along a path works well. Fix the ropemaking machine (a crank with three hooks) at one end.
4
4
Attach the strands to the machine hooks
Attach the strands to the machine hooks
Tie one end of each fibre bundle to a separate hook on the ropemaking machine. Walk the three bundles down the rope walk, keeping them separated and parallel. Tie the far ends together to a single swivel hook on a fixed post or stake.
必要な工具:
Ropemaking Machine5
5
Apply initial twist to each strand
Apply initial twist to each strand
Turn the crank clockwise. All three hooks rotate together, twisting each strand individually in the Z-direction (clockwise when viewed from the machine end). Keep the strands separated — they must not wrap around each other yet. Twist until each strand is firm and begins to kink when slack is given.
6
6
Insert the top
Insert the top
The 'top' is a grooved wooden cone or triangle with three slots that separate the three twisted strands. Insert it between the strands near the machine end. Each strand sits in its own groove. A helper holds the top or it hangs from a support.
必要な工具:
Rope Top (wooden separator)7
7
Close the rope — advance the top
Close the rope — advance the top
Continue cranking. As the strands try to untwist, they naturally wrap around each other behind the top in the opposite direction (counter-clockwise, S-twist). The helper slowly walks the top away from the machine, allowing the three strands to lay up into rope at a controlled rate.
8
8
Maintain even tension
Maintain even tension
The person at the far end must keep the strands taut by leaning back or using a weighted hook. If the tension drops, the rope will be loose and lumpy. If too tight, the fibres can snap. The top should advance smoothly — about one turn of the crank per centimetre of rope formed.
9
9
Complete the lay
Complete the lay
Continue cranking and advancing the top until it reaches the far end. The entire length is now three-strand laid rope. Stop cranking — the opposing twists hold each other in equilibrium.
10
10
Secure the ends
Secure the ends
Whip both ends of the rope with thin twine — wrap tightly around the last 2-3 cm and tie off. This prevents the strands from unravelling. Alternatively, back-splice or tape the ends temporarily.
11
11
Stretch and set the rope
Stretch and set the rope
Hang the finished rope under moderate tension for 24 hours to allow the fibres to settle into their final position. Hemp rope stretches slightly when first loaded and this pre-stretching stabilises the lay.
12
12
Coil and store
Coil and store
Coil the rope clockwise (with the lay) to prevent kinking. Store in a dry place — hemp rope is naturally rot-resistant but will degrade if stored wet. A well-made three-strand hemp rope has a breaking strength of roughly 10 times its diameter in kilonewtons.
材料
1- 500 gプレースホルダー
必要な工具
2- プレースホルダー
- プレースホルダー
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