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Discussion in 'Buy and Sell' started by Bootboy, Mar 20, 2014.
I'm breaking prussik loops tomorrow.
Yeah, it wasn't cheap. My webbing clamp is pretty skookum too.
Here's my webbing clamp in action. Sewing rabbit runners with #138 thread and Sterling 11/16" webbing.
Things to come
Broke a bunch of stitched loops and a couple eye-eye VT's
I used 6mm Edelweiss and PMI prussik cord.
This is pretty representative of the batch I tested.
For the loops, they tended break at the carabiner and at the stitching about equally, indicating that the stitching only causes a very minor loss in strength if at all.
The eye-eye invariably broke at the start of the stitching, which is typically the mode of failure for all stitched load bearing gear. The cord for the eye-eye will be upgraded to either a tech cord, or a larger diameter depending on my results with some proprietary cords.
Going to send some out to get hard numbers for crunching on these failures.
Also, getting samples of some 6mm technora over polyester and polyester over nylon prussik cord from another manufacturer. Hoping for much higher numbers. The published numbers look better, but the proof in the pudding is in the eatin'... As they say
Shooting for an MBS of 13kn, which should be easily attainable. I looked and discovered that the UIAA does not have a standard for sewn cord, only the cord itself and sewn webbing.
There maybe a specific CEN 5-- standard but those standards must be purchased. Anyone happen to know?
Bootboy your stitching looks very nice.
Have you considered cutting a length of (skinny) dynamic rope (climbing rope) and stiching
that single strand with loop ends for a tether?
This might provide some measure of fall protection in a canyon-friendly package?
I sure have. Canyon cow tail. I've got to find a 9mm rope that will work well for the application and in my machine. 9mm is the upper limit of the rope sewing capability of my machine and the rope and thread combo has to be just right. I'm going to experiment with dyneema thread as well. I'm also trying to come up with a good way to protect the stitching and eyes from abrasion.
So I ordered samples of 5 different prusik cords, 3 of them being technora over either polyester or nylon. I received 2/5 (7.5mm and 9mm) in the mail the other day and unfortunately, neither of them will consistently stitch to my satisfaction, don't know exactly why. The good news is, they were the two I was least interested in sewing. The third technora cord Im waiting on is a 6.2mm technora over nylon. I have a second source for a very similar cord that I can try if that doesn't work. Just hoping to land on a baby bear (just right) cord so I can get to work on some unique products.
Also started work on a canyon specific etrier. It will be made from a polyester webbing so it wont get as soggy as one made from nylon. Perhaps an ultralight version from dyneema for the weigh conscious canyoneer.
Working on CAD for a fun and unique little piece of aluminum hardware. Hoping to have a machinist friend run some samples for testing.
Starting a new batch of rope bags over the holiday break as well. Ive gotten really positive feedback on the design over the last year and they are holding up very well through some pretty heavy duty use.
More odds and ends coming, including my website! My page builder is coming home from a 6 month work assignment in Guam next week. We will set about putting the site together and setting it up for online commerce.
I've got one cord I really like. 7.5mm with a very supple sheath that allows the rope to really flatten out and grab even 8mm ropes.
Bought some high quality, bonded poly thread too. Stitches like a dream.
Still waiting on the 6mm technora over poly/nylon.
Got some lengths of both 6.8mm and 6mm technora over nylon in. Sews like a dream.
22" VT or 12 & 16" loops finished with adhesive lined heat shrink tubing.
Average breaking strength for eye to eye is 12kn (2700lbs) and 23kn (5060lbs) for the loops.
Also have 6mm nylon/nylon loop and 7mm nylon/nylon Eye-to-eye
Also have 8.5mm technora over polyester. Limited supply of this stuff as its no longer produced.
All of the above are made with EN 564 compliant cords that meet UIAA 102 or ANSI and/or NFPA standards and are sewn in compliance with those respective standards where applicable.
Fresh batch of tethers in burgundy.
Those look great, Bootboy!
What length are they?
Nylon or poly?
24" ish depending on how much harness you girth hitch it around
my webbing is actually a nylon poly blend. The grey stripes are poly while the color is nylon.
Dyneema. Interesting things are going to happen...
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Had a batch of assorted webbings and hardware come in. I will be prototyping a new harness this coming year.
What would you guys like to see in a Colorado Plateau specific canyoneering harness?
Up to this point, Ive been modifying BD alpine bods and can get a least 100 really scrapey, squeezy canyons out of one. My last one got me through two seasons of serious abuse, but I'd like something with the Atwood name on it. The only harness built for the rigors of canyoneering on the CP.
Playing with harness geometry.
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This looks fantastic.