Rigging ropes and pulleys

[Rupe]

I think most pulleys will take one size up in split tails. This is plenty to give the extra strength required at the anchor point. Squeezing a 19mm split tail into a 16mm pulley is not going to weaken it and certain not by more than you have gained in moving up from a 16mm anyway.

[gibbon]

Do you think there is a potential problem with using the larger Split tale with the pulley ?

 

Maybe

 

I once wrecked a isc blue pulley by using a green 2t webbing sling to anchor it. Was hard to close the pulley and big lumps were dropped into it. Didn't seem right after so was put to one side. On the next loler assesment the chap said that the bearing had collapsed. I am not sure whether it was using a sling to big for the design or wether it was the size of the lumps I dropper into it.

[bob]

Cheers Bob we have a blue 19mm. The green really only comes out when the blue is to short to get enough tucks on the timber hitch.

 

Do you think there is a potential problem with using the larger Split tale with the pulley ?

 

Yes i do although i obviously do not know what pulley it is

most of the cast pulleys we use tend to have a 20mm bushing but certainly having to force anything in will not help especially as when you load it the split tail will actually flatten and even put more force on the sides

[Will Hinchliffe]

Thanks for the advice.

[Dean Lofthouse]

as when you load it the split tail will actually flatten and even put more force on the sides

 

Good point Bob, I like to see brain cells being used for other things than whens the next cup of tea coming, nice one

[Mark Bolam]

Time to move out of the dark ages and get myself a lowering pulley (use 16mm double esterlon) as I've recently been alerted to the dangers of the tight bending radius of lowering through a crab.

 

Would like the smallest, lightest pulley that will do the job. What would that be? ISC medium?

 

Also, is it safe securing it with a 30kn webbing strop, or should I be using something beefier?

 

We don't tend to rig down 200ft Wellingtonias too often, so I don't want to over-spec the job.

[Tom D]

 

Also, is it safe securing it with a 30kn webbing strop, or should I be using something beefier?

 

 

I'd say no since the 30kn will be the breaking strain and therefore your SWL on that sling would be 4.2 kn which is a little low for even small jobs. Having said that in the beech dismantle vid I posted recently I am using exactly that:001_tongue: TBH though that pulley and sling are normally used as a redirect or for light work such as that beech, really though I should have changed to the large pulley for the bigger stuff. The other problem with a webbing sling is its difficult to adjust on a single stem when blocking down so a proper round spliced split tail would be better. then it can be timber hitched or cow hitched to suit.

[Mark Bolam]

What pulley do you use Tom?

[Tom D]

The really bad thing is I can't remember the makes, I'm pretty sure they're both ISC. I have a small red swing cheek one which is the one in the Beech vid and a larger blue one which has a (i think) 24mm split tail. The blue one is sort of visible in the pine dismantle video from a while back. They're pretty common.

[Rich Rule]

What pulley do you use Tom?

 

Have a Word With Mick stockbridge, he got a nice bit of kit in recently, he Would probably be able to let you knoW the type/costs etc. pics of the kit in action in the four pops thread.