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DIY sewn webbing strength

In our industry its 5 rows of stitching for every inch of witch of webbing. Stitch length plays big part too. We use tex 415 though. Lol
 
ckossuth said:
Here you go!!!View attachment 14030
Click to expand...

Looks like my DIY knaider and swaider were at 30%. Im making a new double CAYG aider. And doing this tether webbing.
I worried about my pattern more for the tether of course than the aiders. I have the means to lift big things in my shop. Looking forward to destroying my 30%ers.


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Stitched up another one to test with that same 4200 lb motor. Webbing broke again before stitching failed. The webbing is rated @ 4,000 lbs, I am beginning to think the webbing just won't hold that weight. It did break where I had made 5 passes perpendicular to the webbing. My thought is that those extra stitches kept the webbing from stretching there and that is where it snapped. But again the webbing failed trying to pickup a weight above its rating. This was s staight vertical lift, one loop hooked to the motor via a clevis and the other loop hooked to the forks via clevis and cable sling in a straight vertical fashoin.


Pics of break area from each side.
a26ecb25dd5e8faf0b9299aaf1ab06cf.jpg

171133c17a5e5dc82fc71c055166bad9.jpg
 
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Failure mode in splices and sewn eyes tends to be right between the sewn or spliced portion, and the 'rest of the rope or webbing'. Your theory is pretty sound. It seems to be the "joint" if you will that fails.
 
Great testing....forget the webbing, how did the motors take the drop...lol


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sdonx said:
Great testing....forget the webbing, how did the motors take the drop...lol


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Click to expand...
That was nothing. Things get abused here, paper mills are rough on equipment.
 
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