Bowing after ripping wide board

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Forum topic by rut posted 05-16-2012 01:08 PM 1022 views 0 times favorited 2 replies Add to Favorites Watch
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81 posts in 1803 days

05-16-2012 01:08 PM

I had some 10-12” wide hard maple that I had to rip to make raised panel stiles/rails. After planing to 3/4, cutting to length, then ripping to 2 1/2” I noticed that a good handful of the boards were bowed. I’m assuming that there was stress in the wide board that my ripping released that caused this. Does that sound feasable?

Next question is what are they good for? Is this considered normal waste?


2 replies so far

View Scsmith42's profile


125 posts in 2098 days

#1 posted 05-16-2012 02:28 PM

Rut, when you planed the boards did you take an equal amount off of each side? If not, the cupping is most likely due to differences between shell and core moisture content within the board.

-- Scott, North Carolina,

View Charlie's profile


1100 posts in 1707 days

#2 posted 05-16-2012 06:58 PM

Stresses in wood make it sometimes do this odd dance as it comes off the other end of the saw. Same wood (hard maple). I had a 6 and a half foot length yesterday. Sent it through the planer, flippin’ it after each pass. No cup, VERY slight bow, no hook. One edge was straight-lined as it came to me so I checked and it was still straight as an arrow. About 6 inches wide, I now had to rip it in a pair of 1-5/8 and a 1-3/4. First rip actually felt like it bound a little but it pushed through right away. Second rip it starts REALLY binding. Now I’m watching the blade and my hands, but it’s getting REALLY tight. I stop feeding and look at the5 feet or so past the saw. The ends actually crossed. One end climbed up over top of the other by a good inch. I stopped the saw (knee stop), walked around and put a small wedge in the kerf, made sure it was ok for a restart (turn blade by hand), energize, start the saw and the rest of the cut was like butter smooth.

Lesson learned. If it feels like it’s binding, it probably IS. I’ll know now that I’ve felt that to stop feeding and check. This is another good reason why you should NEVER have a hand in front of that blade. If the wood relaxes in the other direct, and you’re applying more pressure on the feed to try to “power it through”, it could suddenly feed much faster and you get a hand involved with the blade.

I took a look at the result of the rip Some of it was still usable as I needed some shorter pieces, but only 1 was usable as a 70 inch piece. I guess yo gotta chalk it up to waste and use what the tree gives ya.

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