On occasion, I have experienced warping after jointing a board dead flat and running it through the planer. The jointed board stays flat for several hours but warps as soon as it is planed. This has occurred with oak, maple and pine. Any thoughts?
I suspect this problem is caused by incorrect drying which is building stress within the wood. This stress is then partially released when you machine more from one face than the other.
Read up on doing your own stress tests by drying a sample piece in an oven. If it is a problem, you will need to go back to your wood supplier.
You could minimize the problem by planing off opposite faces more equally.
I have also experienced warping due to lack of time to allow the wood to stabilize to the conditions. This is most common during the extreme hot or cold times of the year.
To reduce the warping, remove consistent amounts of material from both the top and bottom of the material. This may help.
Dave Rankin, forum technical advisor