Recall that gum slab wood outdoor table I made a few months back? Did I mention it was an experiment so was a gift for Sis as couldn't sell it? Well I was given two old nearly empty drums of epoxy that had been laying around in Sis' shed for years and she didn't know about until I noticed them recently. Turns out there is still about 25 gallons of resin in them so i thought I'd thank her by flood coating that table that I still haven't delivered to her bc I can't lift it without tractor which is 5 hrs away for another few months. So, I pulled the cover off the table last evening and laughed.
A few weeks back we heard a rifle shot and every neighbour I spoke to just thought it was another neighbour taking care of a possum (pest here). We were wrong.
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I placed those tenons to try and stop this, knowing the slabs weren't fully seasoned. Look at how they have sheared - across the grain. The force required to do that is extreme. It's not ripping down the grain but the epoxy held and the fibres of the tenon sheared across the grain. Would have had to be many tons of force and I'm quite sure that was the rifle shot we all heard a while back.
I'm more stoked to have heard and experienced this failure than i am worried about the table. Have got some clamps on it to restrict/guide any future movement and will give it the rest of Summer and then use my new big saw to cut it up enough to get it all back together with the free epoxy I have. Hopefully by then it's moved all it wants. I have always known it's really difficult to hold back timber if it wants to go, especially eucalyptus, but thought I'd take a chance, do what I can to mitigate and see what happens. A really cool lesson to learn. I never thought the tenons would shear like that and the epoxy would hold them in the mortice so the only way left to relieve the stress was to shear across the grain like that.
I wonder what the force required must have been. Yuge.