Split Along the Grain in Wood Panel

[Jason Fackler]

Hello,

I need help understanding if my design is bad or if there is something else causing the wood to split along the grain in the same place on multiple units. This was cut from a 3/4" panel. I'm having a high defect rate where the wood splits somewhere along the thinnest upper part of the piece. The wood is at least 2 inches wide there. There are no other warping or splitting issues anywhere else. It was finished with urethane before the split occurred and the moisture content of the wood before being cut was 9.9%. It seems like larges changes in temp and humidity cause it to split after being finished. Please tell me if my design is bad and needs to be wider than 2 inches in that location or if the problem is more due to the wood panels. Thank you.


JasonSplit.jpg

[Andrew Hughes]

Did you make the panel that I see finger joints on. The only thing I can imagine with out knowing all the details is the Mc is to high. When it shrinks it’s weak right at the shortest grain area.
Good Luck

[Jason Fackler]

Thank you for the reply. I bought the panels and then made the cuts. The MC may have been too high. I'd like to know that the design is okay before trying again with different panels.

[Mel Fulks]

Yes, more wood at top would help. It's possible the crack was already there. You can saw off a little at the end of a board
and check for soundness before proceeding .

[Jason Fackler]

Thank you for the reply. I will try to cut off a strip at the end of the board. That sounds like a good suggestion to see if a small crack has already formed.

[Brian Holcombe]

If it's being bolted to something, then that is what's causing the crack.

[Jason Fackler]

It had never been bolted to anything before the crack occurred.

[Brian Holcombe]

Not enough material, or the split was already there. That area is going to shrink faster than the rest of the board.

[Steve Jenkins]

Wood loses moisture faster from end grain so with that section being only 2” long (grain wise) it’s probably shrinking faster than the main panel

[Jason Fackler]

That makes sense. Thank you for the reply. Any idea how thick it should be?

[Jason Fackler]

Thank you. I guess it needs to be thicker than 2". Not sure how much though.

[Andrew Hughes]

I’ve noticed in commercial made panels there can be a lot of stress. Esp ones from Ikea.
It’s manufactured in a production way they force the wood together to close any gaps. This adds stress and tension back into the wood.
Ikea counter tops are the worst.
Good Luck

[Frederick Skelly]

If it were my project, I'd try one at 3" instead of 2". If it doesnt break, I think you have the answer. Using 3" will also make it less likely to split when you screw it down to whatever it attaches to.

Let us know how it goes Jason.

Fred

[Jason Fackler]

Thank you, Fred. I will try 3".

[Jeff Bartley]

If your buying pre-made panels I would try glueing up you own so you can better manage the internal stress.