Is this Coffee Table design structurally doable?

[tim.lavelle]

Hi all! I've been doing a bit of hobbying with F360 for 3D printing, but as we start to build our house in about a years time, I wanted to start dabling in DIY woodworking. With that said, I'm starting out with designing a new coffee table for our living room and I wanted to post it here to see if I can get some advice on whether it's sturdy and doable.

I want to give it a 'floating' effect as the interior top box will be a a Star Wars Diorama filled with clear resin and LEDs on the inside. But as this top section will probably be heavy, so I put a cross-frame support inside the base of the resin box:

And at the center section of the cross beam, it'll be screwed to a cyclinder

So before I add other elements for LED rows, cable holes and power switch, I wanted to firs see if this will even hold, or if I need to re-think the structural support. 

Here's a link to the file in case someone wants to take a look: https://a360.co/3Au1t87

Thanks in advance for any feedback, tips, suggestions, and even criticisims! 🙂 

[davebYYPCU]

Your internal cross members are flat, will bend easier than if on the edge  - more height in the cross section less bending.

Try two across the outside of the cylinder, rather than one flat across the centre of the cylinder, better weight distribution for stability.

(Can't download this one. so sizes are unknown)

Might help...

[tim.lavelle]

Whoops, sorry @davebYYPCU - it's downloadable now

[etfrench]

How is the center column secured?  Consider adding triangular braces to the top of the round portion.

p.s. Consider adding a spreader under the bottom frame to spread the load over more of the frame.  I'd use 6mm steel plate or thicker.

[tim.lavelle]

Thanks @etfrench - I was going to secure it with multiple screws, but with the triangular braces, are you referring to these:

For a steel spreder, can you show me a reference? I'm looking around but see a lot about clamps. 😛 

[etfrench]

Here's a rough model showing spreader plates and diagonal braces.  McMaster-Carr didn't have long enough bolts to extend through the upper spreader, but allthread will allow you to make it any height.  I also didn't show the necessary nuts and washers.

[etfrench]

p.s.  I'd make the feet in the shape of the Star Trek insignia 😀

[tim.lavelle]

Ahh, soo steel screws through the cycliner and it needs to go up into the braces inside the resin box. Got it, thanks for whipping this up mate! 

I've also extended the interior spreaders all the way to the sides to allow more weight. 

Thanks @etfrench!

[tim.lavelle]

Ahh wait... @etfrench - Do you also have a steel circular frame inside here too?

[tim.lavelle]

LOL!!! Just saw the Star Trek response... I just can't bring myself to do that!  😛 

[etfrench]

Yes, spreader at the top also.  The bolts weren't long enough to show them through both spreaders.

There is quite a bit of info on the internet for designing torsion boxes which is the lower portion of the Resin Box.