Replies

1. 
   SteveSchoene | Mar 10, 2010 08:38am | #1

   How are you attaching the top to the base of the table?   That attachment must allow the top to shrink and swell with changes in humidity across the seasons. 

   You also need to consider the wood itself.  How dry was it when you made the glue up?  How had it been stored before you used it.  Did it behave itself when you ripped it on the saw, or did the kerf want to close or open up?   Was the joint well fitting and tight before you glued it up or did you need to use clamps to pull it together? 

2. 
   user-64052 | Mar 10, 2010 01:05pm | #2

   if you are splitting at the glue line in the ends it says that you jointer knives are not set high enough and it doesn't take much. there such be a very slight concavity to your jointed boards when  you first put them together so that contact is made at the ends. when you glue up your clamps will pull it all together. th reason for this is that wood will always contain some moisture and the most convenient way for it to exit a board is througth the area of least resistance, end grain. the moisture closest to the end vacates and when it does that part of the board shrinks and when it shrinks, you know what happens.. so when you joint those ends a hair larger you are compensating for that shrinkage.

   how  and where is the wood bowing

   ron