Forums: Climbing Information: Gear Heads: Re: [gthomann] Sewing your own slings: Edit Log




splish


Jul 29, 2012, 6:37 PM

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Registered: Aug 21, 2005
Posts: 143

Re: [gthomann] Sewing your own slings
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In the mid 90's I was also curious about sewing slings. I did try it, but never had any intention of ever climbing on them.
I had sewn 3 slings, all roughly the same length, with a 5" overlap and a very simple pattern.
I don't know anything about threads and such, so I went to Fabricland, I showed the woman the webbing, and explained the purpose of it.
She sold me some higher end nylon thread and a proper needle she said would not tear the fabric, but instead separate the fibers allowing the thread to pass through without damaging the webbing.

Although I never climbed on them, I did try some very simple tests on them. Using the crane in the shop, I lifted various tools, starting with a Planer/Jointer that weighs in at 3500 lbs and working my way various larger tools till I reached the largest one we have in the shop that weighs in at 6745lbs.
The first sling broke lifting a 14" table saw with a net weight of 5600Lbs, the second sling broke when I lifted the same table saw with 600 lbs of plate steel on it. The third sling never broke and I didn't have anything larger to lift.
I left the sling in the work shop, and my father stole it and has been using it for various construction site needs since. The most impressive, removing a large tree stump. We were trying to pull in out using chains, but didn't have enough chain. First I used a piece of Blue Water 11mm Static line I had that had been retired, but it broke fairly easily. So we had the sling in the work van, and decided it was worth a go. We wrapped the stump in chain, a shackle connected the chain to the webbing, and another shackle from the webbing to the bob cat. I had tied a water knot in each end, so that may have helped some as the solid webbing may have took more of the force than the side that was sewn. We yanked and yanked, the sump did not move. We then resorted to putting slack in the line and then gunning it, putting a massive shock load on the whole system. After about 7 pulls like that, the stump came loose and we were able to remove it.
On the way home from work today, I stopped in to visit my parents, and because of this post, thought of that. Turns out my father still has the sling, and uses it from time to time for little tasks. Here are some images...







Unfortunately, I don't have access to a proper load cell, but I tell you, theis thing has stood up to some beatings. I would love to know what it would be rated at.


(This post was edited by splish on Jul 29, 2012, 9:05 PM)



Edit Log:
Post edited by splish () on Jul 29, 2012, 6:38 PM
Post edited by splish () on Jul 29, 2012, 6:42 PM
Post edited by splish () on Jul 29, 2012, 9:04 PM
Post edited by splish () on Jul 29, 2012, 9:05 PM


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