Should I brace my table top?

[Goteammango]

Hi
First of all, I'm a novice so apologies if some terminology is wrong!
I would like some advice please about whether I need to brace a table top.
I see that it is common to fit a C channel underneath some tables to avoid warping but so far I've not been able to understand when this is/isn't necessary.
The table top I'm buying is
- 1500mm long
- 915mm wide
- 40mm thick
It is made of oak, does not have live edges and appears to be made up from 11 x 1500mm long pieces/planks/strips (so each piece would be 1500x83x40mm).
Here's some pictures

I will also be fitting one of these near each end (the larger one with the 580mm plate, in case this influences whether a brace is required)

Thank you for taking the time to read this and I hope I can learn from people's expertise

 

[ol_london]

40mm is quite thick and it’s only 1500mm long so I would suggest you won’t need to brace that. I suspect others may disagree as there are some purists here who would prefer to see more traditional table construction methods being used.

 

[Sgian Dubh]

The metal plates at the top of the legsets screwed to the underside of the panel should be all that's required to prevent cross-grain cupping, assuming that's what you're concerned about. Just make sure you put the screws through at the mid-point of the slots provided to accommodate the wood's cross-grain expansion. Also use roundhead screws rather than countersunk, and you might also find an appropriately sized washer under each screw head might be a good idea; a washer might be needed if the slot is very sloppy around the screw's shank. Slainte.

 

[marcros]

the steel tops are drawn as slotted, but the ones that I have seen online are only drilled. Slotting is important, so you may need to find a way of doing it (eg round file).

 

[Goteammango]

Thanks for the advice. I'm happy it doesn't look like I'll need a brace - it saves me having to buy a router .
I'll make sure to make use of the slotted holes on the leg plates and will likely use threaded inserts

 

[Sgian Dubh]

There isn't a good reason to use threaded inserts. Just use wood screws driven directly into the wood, after you've bored a pilot hole, of course. Slainte.