Milling lumber and warping

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Forum topic by Gixxerjoe04 posted 04-23-2014 02:18 AM 1036 views 0 times favorited 3 replies Add to Favorites Watch
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850 posts in 1817 days

04-23-2014 02:18 AM

So i got my first jointer and planer a month or so ago, after getting it i got some rough 8/4 walnut. Jointed it and planed it down and cut it down to make my first cutting board. Was going to make an end grain board so i glued the first round, next day cleaned it up and then got behind in worked and did other things. Fast forward I’d say about 3 weeks, went and picked it up today and it was cupped. So now i’m going to have learn how to use a hand plane or use a belt sander i guess to get one side level for my planer since my jointer is only 6 inches.
So my question, what do i do to prevent this in the future?

3 replies so far

View Shawn Masterson's profile

Shawn Masterson

1325 posts in 2189 days

#1 posted 04-23-2014 02:34 AM

This should help, but use caution when performing this task. As for prevention rotate the pieces to alternate the grain.

View woodchuckerNJ's profile


1306 posts in 1875 days

#2 posted 04-23-2014 03:07 AM

Well, first when you plane after jointing, you need to think about taking equal amounts from both sides . you want the moisture content to be about the same and many times the wood might have drier wood at the surface .. of course you want all the wood to be equal but it might not be. Also taking from both sides equally reduces the chance of stress buildup. (I want to say this is not absolute it’s just sometimes happens so it’s a good idea).

Next, if you leave your work unfinished and leave it on a bench, one side of the wood is getting air and the other side is not. Same if you finish only one side of the wood. So it warps. This happened to me recently with some doors I was making, I had the panels stacked. They cupped. I put stickers between them and they went back to normal in a couple of days, which was relieving.

Also when I work, I rough out everything and let it set a couple of days before I do my final planing and cutting. Just to relieve the stresses and see what the wood does. BTW after gluing up a set of boards, I leave it a couple of days, working on other things. You see yellow and white glue swell the wood. If you plane or sand it shortly after gluing it up, in time you will see that it is lower then the other wood. Looks like someone scooped it out. That was a hard lesson on a nice piece years ago.

-- Jeff NJ

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850 posts in 1817 days

#3 posted 04-23-2014 11:50 AM

Thanks for the info

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