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    resawing QS white oak question

    Whats the best way to get flat 1/2" thick QS white oak.

    I resawed a 5/4 board into two pieces and the following day it had cupped pretty badly. It was stored overnight with ample air to reach both sides of the boards. To re flatten it via jointer / planner / sander / handplane would have removed way too much material. It's been in my garage for almost 2 yrs and was bought kiln dried so I think it's just the nature of the wood releasing stresses rather than moisture content issues.

    I am in the process of making some grooving planes out of QS white oak using the laminating method. I glued the suckers up anyways and used clamps to make sure everything was flat and it seems to have worked.

    I can't imagine the best way would be to take 5/4 and run it through a planer until its 1/2". I'd like to make some panels in the near future and would prefer solid wood since I have it instead of veneered.

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    Re: resawing QS white oak question

    Scott Smith is probably our expert on this, but it seems like a 5/4 quarter sawn, kiln dried, resawed should not cup badly. I've had flatsawn cup like that when resawn, but QS cupping seems odd to me.

    You took all the right steps, so maybe you're correct in that it was internal stresses.
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    Re: resawing QS white oak question

    Sounds like stress to me. I have had some that was air dried do something similar and it calmed down over time. You could give it an anti depressant and see if that helps .
    Nothing beats a try but a failure, failure is an opportunity to learn.
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    Re: resawing QS white oak question

    I have a friend who makes violins, he has been working with hard maple and soft fir since
    he was 20 yo and he is now 85. Still one of the brightest people I know.

    He told me when he has a cupped board he takes it outside and lays it in the grass
    in direct sun with the cupped side down.

    He said you have to be careful or it will cup in the opposite direction.



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    Re: resawing QS white oak question

    I'll try crushing some Xanax and adding it to my glue, hopefully that will relieve some of the stress.

    I've been working my way to doing something like this so ultimately the battens would keep the panel flat and straight but would kinda suck to have to figure out how to keep the panels flat while I worked on it.


    https://www.finewoodworking.com/2017...r-frame-panels


    I've got some bowclamps that I would probably use to hold the panel flat against my workbench while I cut the grooves.



    I'll def try laying it out in the sun and see how it goes. Still in the experimental and learning phase. Trying to do as much by handtools as possible.
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    Last edited by zapdafish; 07-05-2018 at 03:43 PM.

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    Re: resawing QS white oak question

    The combination of damp grass on one side and bright hot sun on the other does the trick.



    One machine can do the work of 50 ordinary men. No machine can do the work of one extraordinary man." -Elbert Hubbard

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    Re: resawing QS white oak question

    gotcha, guess i gotta do it early in the morning or water my lawn first.


    Quote Originally Posted by Mike Davis View Post
    The combination of damp grass on one side and bright hot sun on the other does the trick.

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    Re: resawing QS white oak question

    Not really unless you are in a severe drought area. Most of the time the ground is not as dry as you think.



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    Re: resawing QS white oak question

    Quote Originally Posted by Mike Davis View Post
    The combination of damp grass on one side and bright hot sun on the other does the trick.
    Same type of technich is used to flatten Scroll saw boards.
    Berta

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    Re: resawing QS white oak question

    Quote Originally Posted by zapdafish View Post
    Whats the best way to get flat 1/2" thick QS white oak.

    I resawed a 5/4 board into two pieces and the following day it had cupped pretty badly. It was stored overnight with ample air to reach both sides of the boards. To re flatten it via jointer / planner / sander / handplane would have removed way too much material. It's been in my garage for almost 2 yrs and was bought kiln dried so I think it's just the nature of the wood releasing stresses rather than moisture content issues.

    I am in the process of making some grooving planes out of QS white oak using the laminating method. I glued the suckers up anyways and used clamps to make sure everything was flat and it seems to have worked.

    I can't imagine the best way would be to take 5/4 and run it through a planer until its 1/2". I'd like to make some panels in the near future and would prefer solid wood since I have it instead of veneered.

    Steve, which way did the boards cup? Away from the resawn kerf or towards it? (see attached drawing).

    resaw kerf cupping.pdf

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    Re: resawing QS white oak question

    90% sure it was B

    Quote Originally Posted by scsmith42 View Post
    Steve, which way did the boards cup? Away from the resawn kerf or towards it? (see attached drawing).

    resaw kerf cupping.pdf

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    Re: resawing QS white oak question

    Quote Originally Posted by zapdafish View Post
    90% sure it was B

    If it was B it means that the outer portion of your lumber had a higher MC% than the core. After resawing the exposed core absorbed moisture to equalize with the former outer shell and that side of the resawn boards expanded.

    Kiln dried white oak does not absorb moisture in the core of the boards very quickly because the tyloses in the cells blocks moisture absorption. That's why it's used for wine and whiskey barrels.

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    Re: resawing QS white oak question

    Quote Originally Posted by scsmith42 View Post
    If it was B it means that the outer portion of your lumber had a higher MC% than the core. After resawing the exposed core absorbed moisture to equalize with the former outer shell and that side of the resawn boards expanded.

    Kiln dried white oak does not absorb moisture in the core of the boards very quickly because the tyloses in the cells blocks moisture absorption. That's why it's used for wine and whiskey barrels.
    So incomplete drying in the core for white oak and nothing that can be done about it as the cupped state is in moisture equilibrium?

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    Re: resawing QS white oak question

    Quote Originally Posted by PhilCK View Post
    So incomplete drying in the core for white oak and nothing that can be done about it as the cupped state is in moisture equilibrium?
    Incorrect. If the core was a higher MC% than the shell, the resawn pieces would have moved in accordance with "a" in the drawing when the resawn board faces that were formerly the core of the board continued to dry. Lumber shrinks as it dries.

    What most likely happened in Steve's situation was that the shell of the board regained moisture after kiln drying. This will occur if lumber has not been stored in a humidity controlled environment after coming out of the kiln. White oak can be problematic because the tyloses in the pores significantly deter the core from regaining moisture.

    In order to successfully resaw, the core and shell of the board must be at the same MC%.
    Last edited by scsmith42; 07-08-2018 at 11:10 PM.

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    Re: resawing QS white oak question

    OK, I see you point. But either cannot be fixed- either stress relived or moisture equilibrates, correct?

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