Simple webbing pull test

I was actually raised as a Catholic until the age of about eight. Things got ugly between me and the nuns, they wouldn't make me Pope, so... well, it's all good. I'm much happier as a sinner, heretic and blasphemous heathen.
 
Hmmmmm. Those poor nuns have my sympathy, Jeff.
Rumor has it that one of those poor souls on her deathbed kept muttering GU....GU....GU.

images.webp

Btw, was wondering if you ever got your death ray machine working?
 
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Hey, you haven't been bored shitless until you've sat through catechism classes listening to a 70 year old nun go on and on about how great the Children's Crusades were. Apparently, they don't get the memos about the rape, murder and disease part. Still, I could speak Latin phonetically, and even considered becoming an alter boy, until the pervert.. er.. priest explained what the job entailed. Would claim to be a serial killer or bank robber at confession, just to see what they'd do. Fun times. They threw me out of St. Theresa's after-school Bible Studies after only three weeks. Even alluded to the possibility that I was the spawn of Satan.

Needless to say, I'm not a practicing Catholic. But, I did watch a few episodes of that old, sappy, gawd awful TV series, The Flying Nun. Does that count?
 
Freefallin-
It looks like you are from Minneapolis. You should check out David Stiff's Sewing Machine Repair out of St.Paul. He services a lot of the machines for the pack, outdoor gear, etc. makers up in Ely (that's how I heard of him). I bought a Consew 226 from him that has been solid. He runs the business out of his garage. Shoot me a message if you want his phone number, otherwise I bet a Google search will turn it up.
 
I found him, he's about 30 mins away. I will give him a call sometime when I get ready to upgrade to a commercial machine. Good to know he's there for repairs too. Thanks for the tip!
 
Bump. After getting settled in a new state, I am finally getting back to some of my projects. The goal of this one is to develop a sewing pattern for 1" climbing spec tubular webbing, that meets the following criteria:
1. Can be replicated using a home non-commercial sewing machine.
2. Can meet or exceed the breaking strength of the material
3. Can be reliably reproduced by others with an expected strength based on pattern and number of stitches.

After reading everything i could get my hands on, I developed a sewing pattern that uses 45 degree stitching with #69 polyester thread, to maximize crossing the warp and weave of the material with each stitch. I start with a square frame around the stitching area, then fill it with diagonal lines in both directions, keeping the overall stitch density down to avoid over stiffening the fabric and weakening it. Finally I sew small bar tacks on each end of the pattern to protect the end stitches. The ends have been sewn to make them fit on an aluminum ring better.
2018-01-31 14.47.08.webp

This 12" strap is a replica of one I made to move the knot away from my Captain, I sewed directly to the hook shackle on one end, and to an aluminum ring on the other.

First break test came back today from @yoyoman

For a first test I think this went really well! The stitches were definitely shredding, but the strap broke first. A more concerning observation is that a strap rated at 20kn broke at 16kn, that is something else to explore.

I am not ready to call this a complete success but I think with some more tests at different diagonal stitch densities and strap configurations this could be a winner.
 
Thank you for this thread guys.
Looking at the video stitching starts to fail in the area of the biggest difference in stretching forces so a bit of reinforcement there and you should be at the strength of the webbing.

There are threads like this one :
https://www.fil-tec.com/Premofast-CWT
which at v138 is fine with 21 needle --- so usable in old singers and some newer machines spec'd for 21 needle with little modification.
Regards,
P.
 
I tried this v138 -straight stitch with #21 needle (Singer 15-90 no modifications) - works OK.
Also tried v92 Plus with Schmetz #19 needle [Kenmore 1601 no modifications- (spec'd for #18 needle)] -with acceptable results.
 

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  • Test Pad S 15 90 v138.webp
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This one will get you close to v138 strengths.
Sample of v92 Plus - roughly 70% stronger than v69.
#19 needle -
 

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  • Test v92Plus Ken1601 4point.webp
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JeffGu said:
I don't doubt that a bit, for one that would handle 5k lbs... my little 500 lb. one, I've overloaded a few times trying to weigh logs. It doesn't seem to lose its mediocre calibration (I weigh myself with it, and compare that to a digital bathroom scale) by more than a few pounds, but then I'm not putting anything like 5k lbs. on it. It's not too accurate, anyway, at either end of the scale... but pretty close in the center half of the range. It was also $25 so I wasn't really expecting much from it.

What's the max limit on a Rock Exotica load cell? Seems to me they're not in the 5k range, I'll have to look that up, or just let Frank answer. I'm pretty sure he has one... or five.

:inocente:
Click to expand...
4000 max as far as I remember
 
@FreeFallin what machine do you have ( admittedly I only read pages 1 and 4 so if you already stated my bad...)

I just did my first few attempts at sewing webbing tonight on my old Pfaff 332.
I did multiple bar tacks with 50 stitches per BT with each BT connected so there's only the start & finish termination points (not two terminations per BT). By connected i mean á la weaver style where you stitch the BT then set the machine to do a straight stitch, lift the foot, turn the work piece 90 place foot back down and run 6 stitches, then lift foot and turn the work pieve back to make the next bar tack parallel with the last and switch back to the zig zag stitch.
 
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