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DIY sewn webbing strength

Squirrels

Squirrels

Well-Known Member
Joined
Oct 29, 2017
Messages
2,017
I have an industrial machine. I’m using T90 mil spec thread, 4000lb breaking strength mil spec 1” tubular webbing. Following direction of On Rope: North American Vertical Rope Techniques for stitching patterns and specs.

Here are a couple videos of lifting some motors with what I made. You decide for yourself if it passes the test.

Not a stitch out of place after all 3 lifts.

This one was 3200lb


This one was 4200lb

Here is how they were arranged for lifting. Webbing laid over the forks for the first 2 videos ("V basket style")
b310f3966768acb861cff5900dff51e6.jpg




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This one was 4200lb with a striaght vertical lift, webbing failed before stitching or carabiners did.

4125c0cec10ca46258483eda75f5406a.jpg





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Last edited:
Squirrels said:
I have an industrial machine. I’m using T90 mil spec thread, 4000lb breaking strength mil spec 1” tubular webbing. Following direction of On Rope: North American Vertical Rope Techniques for stitching patterns and specs.

Here are a couple videos of lifting some motors with what I made. You decide for yourself if it passes the test.

Not a stitch out of place after either test.

This one was 3200lb

This one was 4200lb

Here is how they were arranged for lifting. Webbing laid over the forks.

6005f5bb97a8559d7e0c7fe14631ede9.jpg


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Click to expand...
Hey man where do you work?
My company sells industrial electric motors, VFD's, and gearboxes.

ESR Motor Systems.
 
Length of stitched area and pattern please?


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Nutterbuster said:
I like where this is going. I'd be quite interested in buying a quality, sewn bridge and tether.

I do have one question though, isn't each stitched section only holding half of the motors weight in this application?
Click to expand...
I'm not an engineer or physics guru but i think you are correct here.
 
This is awesome. I have sewn my own tubular webbing aiders using info from On Rope but I don’t have the equipment to put them through that kind of test though! I know they’re really damn strong but can’t quantify it like you did - that’s great.
 
Squirrels said:
I'd suggest refrerring to the "On Rope" book about stitch patterns. That is what I used as a rference and guide.
Click to expand...

So I gotta buy a book to know what stitch pattern you used and over how many inches?...


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shwacker said:
So I gotta buy a book to know what stitch pattern you used and over how many inches?...


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I don't want to misquote it. You can find pictures of the pages from the book in the Kestrel Clone DIY thread on one of the many pages.
 
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