Core Dependent Eye Splice

Core to core

The Core Dependent Eye Splice is used to create a permanent loop at the end of a rope. It is intended for double braid ropes with cores made of Dyneema®, Spectra®, Plasma®, Vectran®, Technora®, Kevlar® and other high modulus fibres or any combination of these fibres.

Preparations

Items required for this splice include…

Rope and matching fid
Measuring tape
Tape
Scissors
Marker

Fids & Measurements

It is important to note that when we reference a “fid” or a number of “fid lengths” within these splicing instructions, we are referring to a “full fid length” which is calculated at 21 x the rope diameter. If you are using fids for your measurements, you must be sure to account for the type of fid you are using i.e. “half 10.5x, long 14x or full fids 21x”.

Stage 1 – Measurements & Marking

Step 1
2
4
5

1 2 3 4

Make “mark 1” 2 fid lengths (42 times the diameter of the rope) from the bitter end.
Tie a simple knot in the rope approximately 10 fid lengths from “mark 2” or further and as needed. Form the desired eye and make “mark 2” opposite of “mark 1”. (If you are installing a thimble, form the eye around it and make “mark 2” opposite of “mark 1”.)
From “mark 1”, measure a ½ fid length (or 10.5x the diameter of the rope) away from the bitter end, at this point, carefully spread the cover strands and make “core mark 1″.
From “mark 2”, measure a ½ fid length away from the bitter end and once again spread the cover strands and make “core mark 2” as shown.

Stage 2 – Pulling out the Core

Step 1
2
3
4

1 2 3 4

Carefully pull out a section of the core at “mark 2”.
Look for the “core mark”.
At “mark 1”, pull the core out entirely towards the bitter end.
Make a “taper mark” 1 fid length (21x core diameter) from the bitter end.

Stage 3 – Burying the Cover

Step 1
2
3
4
5
6
7

1 2 3 4 5 6 7

Cut the cover a short fid length from “mark 1” towards the bitter end (as shown).
Make an “exit mark” on the core 1 long fid length (21x the core diameter) from “mark 1” towards the bitter end.
Place the bitter end of the cover in a fid of an appropriate size.
Enter the core at “core mark 1” and run the fid the short distance towards the bitter end and exit at the “exit mark”.
Remove the fid.
Taper the cover.
Hold the crossover point in one hand and milk/smooth the core towards the bitter end. (The tapered cover will slip into the core.)

Stage 4 – Core into Core

Step 1
2
3
4
5

1 2 3 4 5

At “mark 2” (the small loop), pull a length of the core leading to the simple knot out, enlarging the size of the existing loop of core.
A large loop of core should be exposed as in the photo.
From “core mark 2”, measure 3 fid lengths away (63x the core diameter) from the bitter end and make an “exit mark”.
Place the bitter end of the core into a fid and enter the core at “core mark 2”, run the fid away from the bitter end.
Exit at the “exit mark” and pull out a fid length and look for the “taper mark” made earlier.

Stage 5 – Tapering the Core

Step 1
2
3

1 2 3

From the “taper mark”, mark and cut every 4th set of left and right strands a total of 3 times.
Cut and remove the next three consecutive strands towards the bitter end.
Now, cut the remaining strands at an angle.

Stage 6 –

Step 1
2
3
4
5
6

1 2 3 4 5 6

Align “core mark 1” and “core mark 2”.
Hold the rope firmly where the 2 “core marks” meet.
Now milk/smooth the outer core over the buried core to draw the tapered end of the buried core inside the rope.
The splice should now look similar to this step’s corresponding photo.
From the simple knot, work/smooth/milk the cover toward the splice.
An amount of core will be drawn into the cover during this process.

Place the eye on an anchor point as shown in the “Double Braid Eye Splice” and continue until the “core marks” and all exposed core has been covered.

We do recommend the use of a lock stitch to hold the eye in place during zero load conditions. (The long or longer straight bury instructions include instructions on stitching)

The finished eye should look similar to this.

Additional methods for setting the eye on larger diameter rope or slightly tighter braided rope:

With the loop/eye ON the anchor point, tie the rope at the slipknot (made in Step 3 of Stage 1) to a strong fixed point or to another rope with controlled tension or alternatively, enlist the help of another person and have them hold the slip knot and pull on the rope. This helps in two ways, firstly, the added tension reduces the diameter of core, cover and crossover to be buried and secondly, it frees you up to use both hands to milk the cover from the slipknot towards the eye.

With the loop/eye OFF the anchor point, tie the rope at the slipknot (made in Step 3 of Stage 1) to a strong fixed point, now tie a smaller rope to the cover side of the loop close to the crossover point and apply tension to the smaller rope with the careful use of some mechanical advantage, this frees you up to use both hands to milk the cover towards the eye.

Step 1

The End

Core Dependent Eye Splice

Preparations

Stage 1 – Measurements & Marking

Step 1

2

4

5

Stage 2 – Pulling out the Core

Step 1

2

3

4

Stage 3 – Burying the Cover

Step 1

2

3

4

5

6

7

Stage 4 – Core into Core

Step 1

2

3

4

5

Stage 5 – Tapering the Core

Step 1

2

3

Stage 6 –

The End

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Core Dependent Eye Splice

Preparations

Stage 1 – Measurements & Marking

Step 1

2

4

5

Stage 2 – Pulling out the Core

Step 1

2

3

4

Stage 3 – Burying the Cover

Step 1

2

3

4

5

6

7

Stage 4 – Core into Core

Step 1

2

3

4

5

Stage 5 – Tapering the Core

Step 1

2

3

Stage 6 –

The End

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