table planing trouble

[Max Richards]

I'm having trouble keeping my table flat. I use MFB and it will not stay flat
I have tried to bolt it down with bolts but it still moves.Does anyone know how to fix this? I have planed and planed but it will not stay that way.

Thanks Max

[JerryFlyGuy]

I assume that your talking of MDF board. Typically I doubt you'll get a wood table that will never change. You might try sealing it after you've planed it off, however due to humidity and temp changes its going to be always changing to some degree. Switching to an alum. bed would help this.
Fwiw

Jerry