Cutting board problems, for change
I haven't been in the shop for over a month due to a basement clean up task that helped to aggravate a partial tear in my rotator cuff. Got a shot of cortisone yesterday so I'm anticipating an improvement. Hoping to get back into the shop, today I checked 5 completed cutting boards that have been on the shelf for over a month. All of them have been mineral oiled and then a final coat of mineral oil and bees wax. Four of them are end grain and one is edge grain. One of the end grain and the edge grain are fine. However, the other three end grain boards have moved. One has a slight twist and the other two have, what can best be described, as a slight cup. One of them I can make swivel like a lazy susan!!
So, my problem. How to fix them. Some of you may call me crazy, and you probably would be right, but I flattened the end grain boards using my thickness planner. I added sacrificial strips to all edges to level the board and to eliminate tear out and took off about 1/64" or less on each pass. Never had a problem. Anyway, i probably wouldn't have to take much off to re-flatten them but can I do that with the planner since the wood is now oiled. I can remove what little wax is on there with a card scraper. Sanding is out of the question and I don't have router skis.
Any and all suggestions are appreciated since I really don't want to mess up the boards although I do have one which I don't love that will be my test board.