Splicing three strand rope is fairly straightforward and is useful skill to learn. It joins two ropes together of equal diameter and unlike a knot does not weaken the rope to the same extent. When done well the finished result looks neat and shipshape although the extra bulk may prevent the rope from running through sheaves and around blocks. Practice on nylon rope that is soft and easy on the hands. For your first attempt use a larger diameter rope; 3/4 inch is ideal, small ropes are harder. It is also a good idea to use ropes of different colors as I have shown here, as it is easier to spot mistakes and keep track of your progress as the splice develops. Once you have mastered it move on to smaller ropes. Aim to keep the splice neat and tidy at all times and take your time, speed will come with practice.
Nylon rope is soft on the hands but if using small diameter, traditional hemp or polypropylene rope then you may find a small marlin spike helpful for opening up the strands prior to tucking.
To prevent individual strands from coming unraveled wrap a small section of masking or electrical tape around each of the ends.
Unlay about 12 times the diameter of the rope and temporarily use a piece of whipping twine at this point to prevent further unraveling. Place the two ends of the rope together alternating the strands.
Rotate the rope and continue to tuck over the first strand and under the next as shown in the photo.
Continue with one rope until you have four complete tucks. Make sure that you pull the ends up tight as a slack splice is not as strong will kink and is more likely to fail. When you have finished with one half of the splice repeat the procedure with the 3 strands of the other rope.
Do not be in a rush to trim off protruding ends, use firm hand pressure or roll the rope under foot to get the tucks to sit comfortably, work the strands up tighter gain if a hole appears between the two rope sections.
Use a sharp knife to cut the temporary whipping from the center of the splice.
Trim the ends of the strands back flush to the rope and singe the cuts with a flame from a match to seal them. The splice is now complete
An eye splice is formed in exactly the same way as the short splice except that the rope is spliced back on itself. This is a particularly useful splice for attaching fenders to lengths of rope.