While I'm waiting for more brackets to arrive (which, I'll admit, is getting repetitive and y'all are probably getting tired of hearing about it) I am making progress on other aspects of the frame -- tweaks, mostly.
In my conversation with Patrick yesterday, I was pointing out that the lower stretcher on the right-hand side wasn't oriented in the strongest plane for beam loading, due to the way the brackets had to fit together. Patrick protested that it didn't matter, that the cabinet would be an evenly distributed load, and was probably more than capable of supporting the weight of the cabinet. He demonstrated this by (and I swear I am not making this up) laying down on the strut channel and balancing there. Of course, he only weighs about 100 pounds, so that doesn't tell us
anything.
I had a plan for sistering another piece of strut to it, and it involved drilling about 10 holes into the existing piece of channel. He asked why I couldn't just re-orient the channel so that the stronger plane was oriented the way I needed it to be, and I pointed out the way the bracket is designed. He pointed out that I could just drill
four holes in the side of the strut, rather than ten, to which I didn't have anything to say except "derp".
So today I got busy on his (admittedly, excellent) suggestion.
Drilling some holes:
This member is now mounted to the bracket in a nonstandard fashion:
Which gives me a stronger orientation for supporting the cabinet:
The next thing on the docket was to figure out why some of the pieces of strut don't quite align right. Getting everything squared is unexpectedly fiddly with strut channel -- you'd think it would all just end up square when bolted together, right? Okay, probably not. But still, things were a bit wonky in places.
Turns out that two of the brackets weren't
actually square. Fortunately, it was in a direction without gussets, and after thinking about how to bend them a bit, I came up with this:
Attached to this lever, I was able to get it approximately square. And yes, it deformed the strut channel a bit. So be it.
Finally, I've been unhappy with the one remaining U-bracket that secures one of the long stretchers. It only had a single nut/bolt holding the stretcher in place, and that acted more as a hinge than a securely-fastened attachment point. I really need that bracket there, because the cabinet would interfered with just about any other method that I can think of to attach that piece of channel to that leg.
Fortunately, though, the U-bracket has holes for securing a piece of channel in any of three orientations, and I was lucky enough to have one of the slots on the back of the strut channel line up nicely with one of the unused holes. I
also had a 1/2"-13 square nut meant for just such an occasion, which I put to use.
This one little tweak was surprisingly effective at further reducing the ability for that piece of channel to hinge at that bracket. And thus, the frame got a bit better.
All these little tweaks, taken together, have resulted in a frame that is really very, very rigid. I can certainly flex it in certain places, but it now takes some effort. I could
almost just put the torsion box top on and call it a day.
Almost.