My top blanks bended

[octaedro7]

That's right but I would set the weight on another set of sticks..

Thanks!

 

[Benavente]

It's wood. It moves. Consider it to be a sponge and it absorbs moister from the air. It's gonna move. It happens to me all the time. Sometimes I will wait til the season changes and the wood returns to normal. But I mostly store my lumber oversized to avoid any delays in using a topset...

 

[octaedro7]

Thanks again man!

 

[roberthabraken]

Ah, just for my education,
If the wood was sold to me as stable, ready to use, and then bends like this (being stored in the conditions described in the previous post), is it something one should claim to the seller?

Did you sticker the wood (put it on sticks) ? And do you have humidity control in the room where you store the wood ? If yes on both, then I guess it wasn't completely stable yet, otherwise it's hard to prove.

If you sticker the wood, you allow the wood to dry or get damp equally on both sides.

If your room is more humid, the wood will take up moisture and will expand. If you have it laying down on the table, the bottom isn't able to suck up as much moisture as the top does, so the top expands more than the bottom, making it curve down at the sides and up in the middle.

If your room is dryer than the wood, the wood has to get rid of the moisture content in it, because it wants to get at the same low humidity level as the environment. To do so it emits (not sure if that is the right word) moisture, making the wood shrink. If the wood lays flat down on the table, the top can emit more moisture than the bottom, making it shrink faster than the bottom. If this happens, the sides curl up.

So in your case, the wood was more humid than the environment, I guess. If you keep the humidity level constant (that's hard, I know) this shouldn't happen. If you cannot do that, stickering will help to let the wood move in a lineair fashion on both sides.

I don't think it's possible to claim the seller, based on all variables and environmental influences.

 

[octaedro7]

Yeah.
What made me ask is the fact that the sipo body blanks (30 mm thick) did not suffer any bending, nor the Morado FB (9 mm) neither some small 5-4 mm thick blanks (flamed maple, sipo, and zebrano). Just the top blanks. All stored in the same place.
I wondered in what circumstances you´d claim to the provider. In general, what is acceptable and what´s not.
In this case, if I finally have to sand it down and end up with a 6 mm thick top that´s still would be ok for me.

 

[Dirk Diggler]

Well if the wood provider got them to you flat, then it's in your control, they can't and won't accept responsibility. Unless they provided some sort of straight flat board warranty time period, which I think they would be insane to do.
Good luck,
Dirk

 

[octaedro7]

Thanks Dirk.
As I said it was only for my education.

 

[roberthabraken]

(..) Hope you get yours sorted too Rob.

Thanks Meatrus, but I think I have to leave it like this. It's not really visible by eye anyway. But today, I think I finally figured out what happened and if that's true, there's no way I could correct it with clamping or steam. I've replied to my original thread about this: http://www.talkbass.com/forum/f57/warped-body-838189/index2.html#post12137327