Hi,

I'm not quite sure what a jujping box is, but I assume that you will
be jumping on it.

The force of jumping on it is going to try to push the two adjacent
sides apart. A rabbet joint doesn't give you any more long wood grain
surfaces in contact than does a butt joint, if you think about it.

I'd cut a dado in the top for the sides. That will keep the side
panels from spreading apart, at the top. Then fasten the side to
side joint with glue and screws, and at the bottom of the side to side
join, on the inside, put a glue block to keep the bottom from
spreading when a person jumps on it.

The 7 degree taper will make it interesting to cut dados and glue
blocks that are tight fitting, but it should be possible with a few
mental gymnastics. (If it were me, I have to cut two test joints
first, to spoil them in figuring it out.)

Good luck.

Old Guy



On Apr 25, 5:18*am, "SBH" wrote:
I am building a plyometric jumping box using 3/4 plywood with about a 7
degree taper (to avoid tip over) with a platform size of 20 x 24. There will
be 5 total boards; front, rear, right, left and a center for extra strength.
I am thinking about dadoing the corners and the center on the front and rear
boards for the sides to slide into to gain extra strength and stability as
opposed to just butting the ends together with glue and nails.

Is dadoing a better option? I know it's probably not the strongest
connection compared to a dovetail or something else, but I don't have a
dovetail template. Therefore, will the dado be sufficient or is something
else better?

Thank you