ISC UltraLink recall update

southsoundtree said:
Rock climbing rope are considerably thinner than tree ropes.

I had an 11mm as my first rope, 30 years ago. Now people climb on shoe strings...9.8mm have been around a long while.
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Yea. I was ranting about use with tree work. Forgot the thin rock climbing ropes probably work better with them. Thanks.
 
Rock climbers need light weight ropes. Out of the way, and they sometimes carry with them a few hundred feet of rope when climbing. Thin and light weight. Most of them are also dynamic ropes that we have little use for in the tree industry.
I'm with @ATH, if they were light enough, and we had ascenders for them, I would like to go back to a 1" rope. I started out of 1-1/2" rope and it was nice to grab onto.
 
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rico said:
I think ISC and DMM should do a collaboration and produce an UltraLink 3.0 with a swivel. They could call it the Ultra UltraLink, and could come in all kinds of cool colors, splatter patterns, and for a small upcharge you could order it in the not so lovely tree punk motif.
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What's the optimal number of times a safety bulletin or recall should be issued? If it's more than 2, take my money!
 
ATH said:
My opinion: thinner rope is harder to handle when I am actually climbing the rope. If I were just climbing the tree (or rock) and want the rope as out of the way as possible, I'd prefer as small as possible. But when I'm grabbing the rope as a primary part of the climbing system I prefer a little thicker. Heck, if there was a light and pliable 1" or 1.5" rope, I'd choose that. Much better ergonomics for the hands.
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Yea, I am aware of the drawbacks of thinner ropes; I was just pointing out that whether you'd want to or not, the combo pulley/biners will work smoother with skinny ropes. I have little interest in climbing such a skinny rope, and am working on replacing small pulleys with rigging rings in nearly all applications. They're cheaper and more robust, and the only serious drawback is a lack of midline attachability. They're at least as good of a sheave diameter as those little pulley/biners I'm guessing. I have made an Icetail prusik with an incorporated ring and it works in a wide array of configurations.
 
From the base tied SRT tip forces thread, tachyon rope

W45 DMM Revolver, 0.43" groove dia x 0.41" wide groove x 0.027" deep groove, tension ratio 1.77 equivalent mu 0.18 DOH!

W46 DMM Pinto w ball bearing, 1.13" groove dia x 0.75" wide groove x 0.19" deep groove, tension ratio 1.2 equivalent mu 0.06

normal biner tension ratio 1.86!

Always spooked me how the revolver rated 24 kN i.e. normal full strength. Can't find new DMM roller biner. link?

edit - dmm rig biner. Can someone measure the groove diameter, groove width and depth? maybe it's the same pulley as in the pinto rig. Which would be a good thing.

edit2 - thanks Matias. I already found it. Can you measure the pulley?
 
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Bart_ said:
From the base tied SRT tip forces thread, tachyon rope

W45 DMM Revolver, 0.43" groove dia x 0.41" wide groove x 0.027" deep groove, tension ratio 1.77 equivalent mu 0.18 DOH!

W46 DMM Pinto w ball bearing, 1.13" groove dia x 0.75" wide groove x 0.19" deep groove, tension ratio 1.2 equivalent mu 0.06

normal biner tension ratio 1.86!

Always spooked me how the revolver rated 24 kN i.e. normal full strength. Can't find new DMM roller biner. link?
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This is the revolver "rig"

arbsession.com

DMM Revolver Rig Locksafe Carabiner

The DMM Revolver Rig is a carabiner with an integrated pulley sheave. It features a high efficiency roller bearing sheave(s), threaded removable captive bar and a full strength textile friendly becket.
arbsession.com arbsession.com
 
rico said:
I think ISC and DMM should do a collaboration and produce an UltraLink 3.0 with a swivel. They could call it the Ultra UltraLink, and could come in all kinds of cool colors, splatter patterns, and for a small upcharge you could order it in the not so lovely tree punk motif.
Click to expand...
haha! Along with a love note that says 'No Backsies, Sucker'
 
As for the carabiner pulleys. None that I am aware of meet the KN for lifesupport, at least the Petzl and older DMM ones.
I have three Dmm, two wire gate and one trilock. They all work much better than a carabiner, not as good as a pulley. Where they SUCK is they cannot rotate though most hardware like handle ascender attachment holes (locking gate type).
The Petzl one basically fixed this with two gate hinge point options, and is better than the DMM..
I'm sure the Rig ones are best, I just don't have a need... Does look great for a quick and compact MA, more so with the double sheave...
 
I seem to keep a Petzl one on my harness all the time just in case a situation should arise where it would come in handy. Don't think I have used it for about 3 years now and probably should just leave it on the ground. I carry a couple micro pulleys all the time and slipping one on a carabiner has never been a disadvantage for me.
 
dmm revolver 24 kN but pulley functional up to 11 kN
dmm revolver rig 25 kN but WLL 5 kN
petzl roll clip z 20 kN not 23
petzl roll clipA 20 kN not 23
smc ultra link small 30/40 kN wpulley same specs large
grivel roller biner 26 kN

Petzl technically misses the 23kN but they're close
 
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Bart_ said:
dmm revolver 24 kN but pulley functional up to 11 kN
dmm revolver rig 25 kN but WLL 5 kN
petzl roll clip z 20 kN not 23
petzl roll clipA 20 kN not 23
smc ultra link small 30/40 kN wpulley same specs large
gravel roller biner 26 kN

Petzl technically misses the 23kN but they're close
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Wordsmithing! Or legalese. I’m going to have to look up the last two on your list.
I consider a failure exactly as that. If a component ceases functionality below a rated breaking strength it’s broken.
Perhaps they are being too honest. Such as with a normal carabiner experiencing deformation to the point a gate won’t open or close ceases function. Sure it might have quite a bit to go before it’s broken..
take the revolver rig double sheave, in a 5:1. Two bodies pulling on it can easily exceed WLL. One bouncing or getting creative can as well. Sure one can use it smart and safely but it’s ripe for abuse and I prefer most of my gear to be more robust.
Saying all that I still have and use both the oldschool revolvers and one of the petzl’s, still in service and use.
 
The dmm revolver axle is un-aweinspiringly small. But the body casting seems solid. I remember the revolver being one go to for SRT limb walk return till some guy said to mount a micro pulley to a Petzl hand ascender. Think I still have one along with a foot-looped hand ascender in my not using it box. Then the Haas nuked the footloop hand ascender. Time marches on.

For any substantial pulley activity even micro pulleys pretty much suck wind. IMO use real pulleys.
 
Bart_ said:
The dmm revolver axle is un-aweinspiringly small. But the body casting seems solid. I remember the revolver being one go to for SRT limb walk return till some guy said to mount a micro pulley to a Petzl hand ascender. Think I still have one along with a foot-looped hand ascender in my not using it box. Then the Haas nuked the footloop hand ascender. Time marches on.

For any substantial pulley activity even micro pulleys pretty much suck wind. IMO use real pulleys.
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I have the same POV.
I still use mine (these days the petzl). For limb walks and redirects on a ddrt system. Hauling heavy shit into a tree, etc. they have their time and place BUT really aren’t that special.
 
Bart_ said:
dmm revolver 24 kN but pulley functional up to 11 kN
dmm revolver rig 25 kN but WLL 5 kN
petzl roll clip z 20 kN not 23
petzl roll clipA 20 kN not 23
smc ultra link small 30/40 kN wpulley same specs large
grivel roller biner 26 kN

Petzl technically misses the 23kN but they're close
Click to expand...
I remember reading somewhere back in the day that he revolver pulley ceasing to behave like a roller pulley at 5kn was a deliberate design choice to encourage people to use more appropriately sized pulleys where higher loading might be encountered.
 
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