Learning a lesson about Resawing

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[@JamesWilliams-en3os]

Here’s an old resawing tip I’ve found helps a lot. The bowing that you saw with your reason boards isn’t just tension release.. it’s also due to the inner face of the board being at a different moisture level. When I resaw ANY boards, I clamp the outside surfaces together to expose the inside faces, and leave them in clamps for at least 2-3 weeks. This allows the moisture to evaporate evenly and the boards are much less bowed (if they bow at all!).

[@morganhurst_redridge]

That is a really good tip and I'll definitely give it a shot next time I'm resawing! I did check these pieces for moisture on the inside/outside face and they both read as 0% but my moisture meter also isn't that good and I think anything below 6% reads as 0%.

[@1deerndingo]

I'll try that. Thank you

[@JamesWilliams-en3os]

@@1deerndingo fwiw, I learned it the hard way myself a few years ago when I resawed some expensive 8/4 quarter-sawn white oak to try to get planks as close to 1” as I could. Two days later when I went back to start milling, I was horrified to see they had bowed at least an inch (49” lengths). I researched solutions, and found this one. I clamped each pair of boards with outside faces together, using cauls to keep pressure even across the planks, and left them in the driest corner of my shop. I tightened the clamps daily as needed for several days, until they no longer needed tightening. When I released the clamps 3 weeks later the boards were no more than 1/8”, and I was able to mill to a full 7/8” final thickness. Since then, I routinely clamp resawn boards and leave them for up a week before I mill to final dimensions, and they are usually perfectly flat and straight.

[@1deerndingo]

@@JamesWilliams-en3os That's info that should be disseminated. It's suited more to the hobbyist than the commercial environment.

[@giorgiochiappini1931]

That is a good advice for sure regarding the inner moisture gap with the outside faces that can definetly cause warping in the next few hours and days after the cut. But, since the warp in the video happened right after the cut was made (probably even during the cut), this tip won't help in an inner tension release warp like this was. But hey, never thought to solve the moisture problem like you said, Ill'definetly give it a try, thanks!

[@dpmeyer4867]

Thanks

[@dpmeyer4867]

thanks

[@leilaniclark2558]

Thank you Morgan that was very informative.

[@1deerndingo]

Nice video. Informative, required information. Thank you

[@aaronburr2816]

Are you some how related to Luke from the outdoor boys channel? You guys sound incredibly similar and your hands’s gestures are so identical . Plus you look very similar.

[@morganhurst_redridge]

A guy at my work asked me that recently too! As far as I know we're not related.

[@gloriousapplebees]

LOL that's so funny now that you pointed that out I can totally see it

[@traceoeight7549]

Did they bow immediately upon sawing? If so, then the problem was probably caused by improper drying. You may have experienced wood that had been case hardened. Thanks to those who posted about clamping. I will give that a try. "Case hardening describes lumber or timber that has been dried too rapidly. Wood initially dries from the shell (surface), shrinking the shell and putting the core under compression. When this shell is at a low moisture content it will 'set' and resist shrinkage. The core of the wood is still at a higher moisture content. This core will then begin to dry and shrink. However, any shrinkage is resisted by the already 'set' shell. This leads to reversed stresses; compression stresses on the shell and tension stresses in the core. This results in unrelieved stress called case hardening. Case-hardened [wood] may warp considerably and dangerously when the stress is released by sawing. "

[@morganhurst_redridge]

That was my conclusion, internal stresses from the drying process that got released during the resawing process resulted in the movement. I've dealt with case hardened boards before and usually you'll see stress fractures throughout the middle of the boards, especially with 8/4 stock. It's a real pain to work with and leads to a ton of waste!

[@AdamKrukowski]

I'm laughing at the monitor because I had these situations exactly yesterday. I am a beginner woodworkerso maybe I did something wrong, but it worked. I resaw an one inch thick and two feet long oak board . One part was perfectly straight, but the other part was bowed very much, just like yours. I sprayed the curved board heavily with water and clamped it to the flat surface. I was sure it wouldn't work, but when I removed the clamps today after 24h, the board turned out to be perfectly straight. I don't know how it will look after time, but I glued two of them together and so far it looks ok. Maybe it also worked because the board is thin, 0.5 inch.

[@morganhurst_redridge]

I've tried that a few times before with little success but now I think I should give it a shot on these boards, just to see if I can save them for another project!

[@walterrider9600]

thank you Morgan s.a . . question please would wetting the mikkle and place weight on center with ends higher than 1/4 ?

[@morganhurst_redridge]

I've tried that before with pieces like this but I've never had any luck with getting them flatter. I would like to try steaming a piece like this then leaving it clamped to a flat surface, I think that might work, I'd just need a larger steam box.

[@douglasbrown3493]

I miss your videos!

[@morganhurst_redridge]

Thanks, it's been hard trying to find time to make them but I should be a little more consistent now!

[@vmoutsop]

So, you didn't even try wetting the cupped side and clamping it down, You just gave up?

[@morganhurst_redridge]

Yes, because like I mentioned in the video the warp was the result of the release of tense not the moisture content. I've also tried that technique multiple times before with little success, sometimes it's better to know when to give up.

[@vmoutsop]

@@morganhurst_redridge Oops sorry, I guess I missed that. Carry on, nothing to see here other than a commenter eating crow.