also keep an eye on the thread
where thee is testing being done in the white and red areas of that graph.
the metal frame Bar built did not have any vertical supports between the ends of
the beams, that would reduce flex significantly
frame flex testing will hopefully show up in .77 this week (there was a .75.1 or
.74.1 that had it, but not a main release yet)
The difficulty you will have with a frame assembled from short parts is going to
be preventing flex.
I would suggest looking at
Possible super-simple frame as a posible
starting point, when preventing frame flex you need to look at where the forces
are and have a plan to counter them. Bar’s metal frame has two problems:
- the ends of the beams are unsupported so they can flex up and down (Y axis)
- as you apply tension, the frame can flex in the Z direction (probably less of
an effect but still there)
for this super-simple frame concept, it is putting a beam directly between all 4
corners at a height that (nearly) eliminates the forces in the Z direction and
provides support in the X/Y direction so that the beams are all in compression,
none should have flexing loads on them (the loads on the corners will be uneven,
so there will be racking load on the frame, but if you can anchor it down enough
to prevent that, you should be in good shape)
David Lang