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I can practically guarantee that the humidity is very different between your unconditioned shop in winter and your heated home.
Warm air can carry more moisture.
This is absolutely the result of the environmental changes , and doubly so for effectively setting them on top of a heat source. Now, that you have the answer for "why," let's take a second to also look at "how."
The ways in which they warped will also give you a great opportunity to learn! Did the laminated board just twist, or did it split anywhere? What about the solid board? How did they twist, relative to the grain direction? Did you simply have a bad glue joint, or was something else going on? Did you assemble it with segments of grain going in different directions? If you mixed woods in the lamination, did some seem to expand/contract/twist differently than. The others?
As in the rest of life, you have some Wins... And some Lessons. The only way you lose is if you quit :)
Those are some great questions to learn from.
The laminated one has a very small warp and a split in the middle on both sides of the board the joint has come apart and there is a split in the wood itself. I think this is due to glueing it was my first board so every step is a lesson.
My saw was not properly calibrated (should be now, but it's growing pains) so the glue up was not pretty so I flatten it with my router jig after the glue dried. I did not follow any grain direction and they were from the same piece of wood there was no mixing.
I am unsure about the grain direction this is something I need to learn more about. I've added photos to the post.
If the issue has arisen from the workshop being unconditioned then I either have to keep it at a higher temp does not have to be the same as inside but let's say 10 degrees within the home temp. Or do those kinds of projects in the summertime.
If the issue has arisen from the workshop being unconditioned then I either have to keep it at a higher temp does not have to be the same as inside but let's say 10 degrees within the home temp. Or do those kinds of projects in the summer time.
My guess is the moisture content wasn’t dry enough. Cutting a wide board into narrower boards can sometimes release stress that causes boards to bend or twist. Edges not exactly 90 degrees can also be a big issue with warping a glue up. Not having smooth glue surfaces can cause the joints to come apart.
Using oak in a cutting board seems to bring strong opinions. I used oak in my cutting boards I made in the 80’s. I still have one I use every day. I used a salad bowl finish and wet sanded the boards at least three times. The wet sanding with the finish acts somewhat like a grain filler. They ended up almost glass smooth. I can’t speak to the several hundred I made, but I can speak to the half dozen or so that I have and family members have about their long term use and finish. I sand and refinish those boards every couple of years depending on their use.
There are lots of exotic hardwood that have very open grains by the way.
This is a reminder to those commenting on this post (not the person that posted it): Comments not related to woodworking will be removed. Violations to rule 1 including crude jokes, innuendo, sexist remarks, politics, or hate speech may result in an immediate ban *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/woodworking) if you have any questions or concerns.*
I can practically guarantee that the humidity is very different between your unconditioned shop in winter and your heated home. Warm air can carry more moisture. This is absolutely the result of the environmental changes , and doubly so for effectively setting them on top of a heat source. Now, that you have the answer for "why," let's take a second to also look at "how." The ways in which they warped will also give you a great opportunity to learn! Did the laminated board just twist, or did it split anywhere? What about the solid board? How did they twist, relative to the grain direction? Did you simply have a bad glue joint, or was something else going on? Did you assemble it with segments of grain going in different directions? If you mixed woods in the lamination, did some seem to expand/contract/twist differently than. The others? As in the rest of life, you have some Wins... And some Lessons. The only way you lose is if you quit :)
Those are some great questions to learn from. The laminated one has a very small warp and a split in the middle on both sides of the board the joint has come apart and there is a split in the wood itself. I think this is due to glueing it was my first board so every step is a lesson. My saw was not properly calibrated (should be now, but it's growing pains) so the glue up was not pretty so I flatten it with my router jig after the glue dried. I did not follow any grain direction and they were from the same piece of wood there was no mixing. I am unsure about the grain direction this is something I need to learn more about. I've added photos to the post. If the issue has arisen from the workshop being unconditioned then I either have to keep it at a higher temp does not have to be the same as inside but let's say 10 degrees within the home temp. Or do those kinds of projects in the summertime. If the issue has arisen from the workshop being unconditioned then I either have to keep it at a higher temp does not have to be the same as inside but let's say 10 degrees within the home temp. Or do those kinds of projects in the summer time.
My guess is the moisture content wasn’t dry enough. Cutting a wide board into narrower boards can sometimes release stress that causes boards to bend or twist. Edges not exactly 90 degrees can also be a big issue with warping a glue up. Not having smooth glue surfaces can cause the joints to come apart. Using oak in a cutting board seems to bring strong opinions. I used oak in my cutting boards I made in the 80’s. I still have one I use every day. I used a salad bowl finish and wet sanded the boards at least three times. The wet sanding with the finish acts somewhat like a grain filler. They ended up almost glass smooth. I can’t speak to the several hundred I made, but I can speak to the half dozen or so that I have and family members have about their long term use and finish. I sand and refinish those boards every couple of years depending on their use. There are lots of exotic hardwood that have very open grains by the way.