Question about a jointer and planer problem

I have a 6" General International jointer and a 13" Delta dual speed planer. I'm currently working on a maple/cherry dresser and I've noticed a weird thing when I plane/joint wood.
In a few places the surface of the wood has some small ripples. I tried changing the speed at which I feed the stock and I don't seem to see any difference. The funny part is this rippling isn't all over the board but just in a few places. It happens with both the jointer and the planer. I can get rid of them by sanding though.
Anybody can explain me why I get this results.
Thanks for any piece of wisdom.
Wally
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Just a WAG. Since maple is hard and two tools with blades left ripples, I'd wonder if the blades are dull. If sanding leaves the wood flat, you are good to go. Jointers/planers are not designed for final finishing. Sanding is necessary even when you don't see ripples.
Wally wrote:

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My guess is this was a thicker section of the board where the planer 'bit' harder. A scraper or sanding will clean it up as you've already noticed. Two other possibilities are: the grain in that particular spot may have different characteristics; and it's also possible that the blades on the planer are wearing in one spot and the ripple shows up when you feed on that side of the planer. Feed stock evenly across the blades, I usually try to overlap by half a board left-to-right, then start at the left again to achieve even wear.
--
Greg


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By ripples, do you mean about 1/32" wide and high? Runs the length of the board? Sounds like it is time to replace the blades as they are nicked. In the case of the planer, they can be reversed. If both sides are reasonably sharp but just has a nick, reverse only one of them and much of the ripple will go away. Ed snipped-for-privacy@snet.net http://pages.cthome.net/edhome .
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I'll throw in yet another WAG, for completeness - there's nothing wrong.
Even with freshly sharpened blades, you'll have some slight compression of the wood surface, which may vary with density. In some cases, I can joint the edge of a piece of cherry and see those ripples with a raking light. If not, then adding a darker stain will usually bring them out. I typically use a hand plane on edges and a scraper plane to clean faces before finishing.
Depending on your blade sharpness, the depth of cut, and the density variation of the wood, and your finishing schedule, you may not see the issue. In any case, make your last pass through the machine as light a cut as possible.
GerryG

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Both the planer and the jointer are almost new. They didn't even see 30 bf. so far. The blade aren't nicked. The ripples are perpendicular to the board planed/jointed and they are also very close to each other (1/32" to 1/16" max). I'm planing maple at the moment and the board I selected have some interesting features (bird's eye and some other wild grain figures). I guess it may be related to the wood structure. I also some internal tension as well...
Thanks for your help!
Wally
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says...

Question Can you feel these waves with your finger tips. Is the ripples in the maple of the cherry.
First thought is that you have exposed an area of interlocking grain and some attention with sandpaper is called for.
Second thought and take no offense since I can't see the wood and have no idea what you level of experience with these machines or wood is, If you can't feel the ripples you have simply found some figured "curly" grain in the wood and you won't get it out.
--
MikeG
Heirloom Woods
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