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There are points to be made for destructive testing particularly when you are producing a commercial product. My question is... is the "strongest" _required_ for most DIY use. I've used both styles and never had either one fail except for discernible cause. (crappy thread or bad stitches) Not sure even the double box would survive those problems.
I may be slow... But I sure am gimpy.
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The X boxes were all I remember seeing on our parachute harnesses.
It has always been my private conviction that any man who pits his intelligence against a fish and loses has it coming.
I'm operating under the assumption (without having performed my own tests) that longitudinal stitching is strongest (as described in this post). It seems logical to me (and I'm also inclined to trust the Nylon Highway people). I've also noticed that industrial slings often employ longitudinal stitching.
I'd like to know more about these conflicting tests if anyone can provide more detail.
I guess the good news, for me at least, is that even the weakest method, with weaker thread, held 1000 lbs.
Looking at the Nylon Hwy link, I think I know why the box X faired so poorly. We don't use nylon for straps because of STRETTCCHH. A stitch in line with the stretch will move with it. A stitch perpendicular to it will not. The box X is fighting the stretch of the strap in 4 of it's 6 stitches. Even the zig zag box has 2 of the zig zag fighting the stretch and it falls next lowest. In tubular nylon, when load is applied, does it try to get more "round" / the tube open up??? Some industrial slings have some stitches in red and cover stitches over over the tops of the red thread. When you overload the sling, the cover stitches break and reveal the red thread=send it off for repair. See pg 13 on the link.
I use a box X mostly, rarely with a line or double line of bar tacks.
Last edited by nacra533; 02-08-2010 at 21:13.
Great post! One thing Ive run into is sometimes if the stitch across the webbing doesnt go all the way to the edge, the whole thing tends to seperate when a load is placed on it. So, sometimes I handstitch the end of the stitch with a real heavy duty thread--like upholstery thread.---Just in case the machine sewn stitch starts to seperate.
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bear. If the bear just pushes the tree over and eats you, it's a grizzly bear : )
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