I'm going to build a floor stand for my flat screen TV which is 135 pounds. Obviously, I'm a little concerned about joint strength. Here are some photos of my current design. This is going to be my first project, so I'm not sure about joint design and strength.
tv stand 01.jpg tv stand 02.jpg tv stand 04.jpg
JOINT A - material is 2" x 2". I plan on using a 3/4" square floating tenon that extends 3" into each part
JOINT B - material is 4" x 4". I plan on using a 2" square floating tenon that extends 4" into each part
JOINT C & D - these shelves will have a cable box and DVD player on them. There's nothing real heavy, but the support at the legs isn't very wide. My only thought at this time is to dado them into the legs. I would prefer a mechanical lock to stop the legs from splaying outwards, but I don't want exposed dovetails on the shelves to be visible on the back side of the legs. I've also considered using some 1/2" stainless steel rods (2 per side) to attach the shelves to the leg which would create a floating look. However, I fear the rods would be too close together to stop the shelf from tipping.
JOINT C - 1" thick shelf into 2.75" x 3" leg, shelf is solid
JOINT D - 2.5" thick shelf into 4" x 4" leg, shelf is hollow shell (torsion box)
Also, if anyone has any comments about the look of this project, please let me know. I plan to use cocobolo for the legs and feet, but haven't decided on what to use for the shleves. I think I want something a little darker and with less grain than the cocobolo, but about the same color. The 2 arms that attach to the TV wont be seen.