Sewing Strap Loops - Mountain Buzz
 



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Old 02-26-2011   #1
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Sewing Strap Loops

Have a few hair-brain custom strap-down ideas and a heavy-duty sewing machine.

Was wondering if anyone here might know (or opine) the accepted stitch patters for making a drop-loop mid-strap and what kind of tensile strengths are involved with dropping a loop mid strap.

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Old 02-26-2011   #2
 
Carbondale, Colorado
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The only thing I can think of that would be similiar would be the stitching patterns on a daisy chain or maybe an etrier (aider).
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Old 02-26-2011   #3
 
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The "box x" pattern is pretty common in climbing gear.
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Old 02-26-2011   #4
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Daisies that mean business drop a loop with four or five strap-width rows of bar-tack on each side, tight against each other. You could also model off of how belay loops attach to harness waist belts.
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Old 02-26-2011   #5
 
pocatello, Idaho
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sewing

I bought some ebay 1" webbing that was old castoffs from who knows what. I took it to the engineering lab and has it tensile tested. I bought some bulk ancra cam buckles and sewed a ton of straps on the cheap. The sample was small because it took a long time but the results were consistent (low sigma). the webbing was good 10 about 1200 lbs. a simple box X with walmart nylon thread on a regular sweing machine never failed first. the webbing always failed where the machine clamped it and a small tear was able to start. OR the buckle failed if I used a buckle. Even a bit of sewing is surprisingly strong in a linear pull. Bar tacks also held up well. the box X is fast and easy, use good thread and make a couple passes, super easy.
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Old 02-27-2011   #6
 
aurora, Colorado
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I sewed my own straps five years ago. used a regular old sewing machine. did a z- stitch bar tack style. been fine. Bought my last bunch of straps because my time is worth more today. But custom.. best source i've found for bulk buckles is the boat people. $1.50 each for up to 25, $1.30 for 26 to 50, and just 1.15 each for more than 50. you have to call them. not on their website.
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Old 02-27-2011   #7
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Great information, but I can't decipher this bit:

Quote:
Originally Posted by fiya79 View Post
but the results were consistent (low sigma). the webbing was good 10 about 1200 lbs
Also, a linear pull like on a buckle loop seems straightforward where there is one load bearing and one tail. Would the math/shear be radically different where there are two load bearing ends at large angles? I think vector physics is involved and don't know how to phrase, but maybe the two loads work on the stitch exponentially instead of additive? Or, maybe it's February.

Like most things worth doing, it isn't worth the time, but is worth the doing.

Thanks
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Old 02-27-2011   #8
 
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I think the loop "midstrap" is a bad idea if the loads are not all linear to the webbing. If you load any stitch pattern in a non linear manor it may become a point of failure.
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Old 02-27-2011   #9
 
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It's just a little more work (2x the stitching) to add a short strap configured as a loop. This works good for clipping on beaners water bottles etc without affecting the integrity of the strap
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