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Re: 3M Fastbond 30NF - fabric overlap testing
I broke this up because I don't know what this forum does with a lot of pictures.
Next up is to test the strength of the overlap joint.
Picture 1: 73lbs in the bucket. This is strip #2. Strip 1 failed when I added another brick (83lbs) by tearing where the vice grips where holding the strip to the bucket handle. On this one I have a square knot. It does not seem to have any problem holding this and I leave it for a little over a minute.
Picture 2: I added another brick and it held for a bit but I could hear threads snapping. It held for maybe 12 seconds and failed at the knot. I know from being a fisherman that the knot is usually the weak link and it does look like the knot cut through itself.
Picture 3: I tried first wrapping the strip around the handle, two half hitched on the handle, and then two half hitches back on the strip to prevent spinning. It would hold the 73lbs as long as I wanted. My wife came home at this time so I showed her the previous pics. (yeah, that ends up important) We chat, I explain the test, we marvel at the suspended bucket of bricks. This is stable - no sounds etc. I add the next brick. It's holding. I wait. This is going to hold I think. I better take a picture for my friends at TeamKitfox. Oops, I closed out the camera app to scroll through the pictures. No problem. Find camera app, wait, line up pict... WHOMP!
So I missed it holding 83lbs. I could hear the ping of a thread letting loose every now and then anyway. I am posting this picture because it shows the failure in the fabric about 1/2 inch above the knot.
I am satisfied with this. I believe the fabric will fail before the overlap does. No doubt my dining room laboratory does not show us the actual strength but I feel confident that it does show strong enough.
I suppose it's important again to point out that you shouldn't trust my assessment. But you could copy the method... :)