|Forum topic by boroughdan||posted 05-10-2013 08:24 PM||2146 views||0 times favorited||19 replies|
05-10-2013 08:24 PM
I was hoping I could get some ideas on how to design a super stong platform/panel.
a friend asked me to build him some boxes to use for weightlifting. they are large stackable boxes that basically just raise to the weight up for olympic lifts. I used syp 2×12s, made six boxes that were about 3 ft long by 1.5 ft wide.
His have held up but a friend of his ordered a set and on the second lifft the top cracked in half. Very embarrassing.
I think the problem is that the wood doesnt have a ton of strength between the grain, it looked like his split along the grain.I did have one cross member in the center of the top boxes. that wasnt enough obviously.I did have some supports attached along the inside of the box that the panel rested on but those didnt give any support to the center of the panel.
Heres what I am thinking for the redesign.
first I routed a rabbet along the top of the box for the panel to sit on. Im thinking the support piece that runs acros the center (width not length) will be dadoed in instead of just glued and screwed. that would make a support about ever 18-20 inches, one of each edge and olne in the center. should I make 3 supports in the middle to give it a support every 8 or so inches?
If that didnt make sense Ill put up some pictures.
Another thing i am thinking is basically laminating another panel under the top with the grain running perpendicular to the top. This really needs to be able to take a hit from 400~lbs dropped from 4 feet above it.