whipping twine

Not sure if it's mandatory but it is nice if you don't do an invisible lock stitch.

You defiantly need to lock stitch it.

Congrats on your first splice. It's lots of fun and can become habit forming.
 
I think I heard a pro slicer tell me that the stiching & whipping was not absolutely necessary.

It was used as an indicator.
If anything moved, then the splice was slipping.

A couple of twine stiches is not going to add much stregth to the splice !

Maybe this post will generate some Pro-Slicer comments ? ? ?
 
My understanding is that the lock stitching isn't for the purpose of augmenting the strength of the splice. It's intended to keep the splice in position during periods when it's slacked and not under tension.
 
It can be sufficient to set the splice but having a line actually be climbed on or loaded up for rigging will do more to set the line, or so the conventional wisdom goes. Theres quite a bit of force generated just from someone putting their weight to a line and jumping up so it catches them. For the most part, though, its the no-load scenarios that whipping/lock stitching helps with.

EDIT: I was more or less just trying to agree that it's not done for the purposes of strengthening the splice at all- maybe ended up being more confusing than helpful!
 
All of the pro splicer’s that I’ve seen, use something like a building support column to pull against to set the splice. Using lot’s of force ……. !

A 200 lb climber using DRT will only pull approx. 100 lb. when weighted.

Once the splice is stitched, additional “setting” would be reduced by the “crossing stitch”.

If a spice was not properly set, I think you would see some “deformation” at the stitch as it is moved during it’s initial use ?

I am not a splicer. Just observations & comments.
 
It's not that it's not set before it gets used a bunch, it just locks up with a bit more finality after being climbed on a bit. I've always been told that, for example, once a double braid line has been exposed to working loads for a while, even under no load it's not in the danger of coming undone that it would be right after being set during the splicing process. In both cases it's a set rope, but to me that distinction suggests that the degree to which it is "set" changes.

That is at least a mix of what I have been told and what I have observed. Especially seeing how increased forces will lead to greater constriction around a splice, despite having a splice fully set by splicers prior to whipping or lockstitching them. I wish I had an actual explanation for you instead of this jumble of loose empirical assertions... You may be completely correct that there is no difference, but going off what I've seen, especially in cycled break testing, there seem to be degrees of setting in splices.
 
Conceivably? I might actually test that to see what degree of deformation would happen to the locking of an unset splice. Could be interesting to see what happens.
 
My understanding has been that if the splice slips, then the lock stitch would cause the concentric whipping strands to deform where they intersect.
 
[ QUOTE ]
Okay ill have to test this splice its a 5 in eye on 16 strand. Maybe ill hang a 400 lb log from it and see what happens.

[/ QUOTE ]

Not sure what your final goal is here.
1. How will you gauge any movement using 400 lb. ?
2. Be careful ! A weight falling from only 1.5 ft could generate a force that is 10X the weight.
3. Perhaps you should send a sample to a pro splicer, who could pull test it to failure, before you climb on it ?
Just a suggestion.
 
My goal is to see if the splice holds. ItBeing my first splice, i would just use it as a test run. I have a blue streak climbing rope, and i would like to put a 5 in eye on it. But i want to make sure i get the splice nailed before cutting into my line.
 
Also the company i work for has a grapple truck so ill just find a log around 400 lbs or so and hang it from my splice rope to the grapple. I didnt know shock load can be that high! I wiegh around 200 so maybe i should use 1000 lbs ! :-) or i could just send it in, but what fun would that be?
 
I tested my splicing by bombing big pieces of wood onto them. When we were pulling logs out of the woods with a crance and a redirect my 9/16's rigSAVER took 4,000lbs (on the crane computer) no problem.
 
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