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#1
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Help with removing bow
I have a piece of slightly figured maple measuring 23 x 6 x 3/4 that I
wetted and planed last night. However it appears to have dried with a slight (somewhere between 1/32 and 1/64) bow in it (maybe it wasn't planed completely flat either, but it sure looked that way last night). I'd really like it to lay flat w/o going through the whole process again; there is some thickness to spare but I don't want to risk it bowing again/more. Is it realistic to think that if 1/8 shims were placed under the outsides of the board then weighted for a few days that the bow could be negated? Thanks Brian Sheeres |
#2
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Help with removing bow
wrote in message
I have a piece of slightly figured maple measuring 23 x 6 x 3/4 that I wetted and planed last night. However it appears to have dried with a slight (somewhere between 1/32 and 1/64) bow in it (maybe it wasn't planed completely flat either, but it sure looked that way last night). The answer could depend entirely upon what you're using it for? -- www.e-woodshop.net Last update: 12/13/05 |
#3
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Help with removing bow
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#4
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Help with removing bow
wrote in message oups.com... I have a piece of slightly figured maple measuring 23 x 6 x 3/4 that I wetted and planed last night. However it appears to have dried with a slight (somewhere between 1/32 and 1/64) bow in it (maybe it wasn't planed completely flat either, but it sure looked that way last night). I'd really like it to lay flat w/o going through the whole process again; there is some thickness to spare but I don't want to risk it bowing again/more. Is it realistic to think that if 1/8 shims were placed under the outsides of the board then weighted for a few days that the bow could be negated? Thanks Brian Sheeres I do not think that will work . Each time you mess with the surface you rearrange the internal stresses in the wood because the stresses at the free surfaces is zero, and by planing it you have created a new free surface . It might take several days for the stresses to completely relieve themselves . each time now you repeat the process the movement should be less |
#5
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Help with removing bow
chessboard surface and i'm really gunning for FLAT
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#6
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Help with removing bow
It's figured wood and my straight knife jointer and planer were
creating considerable tear-out on the dry wood dispite taking even the thinnest passes. I read a few posts on this NG about wetting the board to soften the grain. It worked really well too; zero tear-out and only a little, what I guess you'd call, scuffing of the grain, nothing a scraper can't fix. Thanks. |
#7
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Help with removing bow
Thanks Mike,
I'll wait a few days then repeat the process. The board started with some twist and 1/4 was milled off, so I'm sure the stresses changed quite a bit. Second time around only a small amout should have to come off. I'll keep ya posted. |
#8
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Help with removing bow
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#9
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Help with removing bow
wrote in message oups.com... I have a piece of slightly figured maple measuring 23 x 6 x 3/4 that I wetted and planed last night. However it appears to have dried with a slight (somewhere between 1/32 and 1/64) bow in it (maybe it wasn't planed completely flat either, but it sure looked that way last night). I'd really like it to lay flat w/o going through the whole process again; there is some thickness to spare but I don't want to risk it bowing again/more. Is it realistic to think that if 1/8 shims were placed under the outsides of the board then weighted for a few days that the bow could be negated? Thanks Brian Sheeres Re-saw it to 1/4" book match it then laminate it to a strong substrate. Dave |
#10
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Help with removing bow
On 10 Jan 2006 12:02:57 -0800, "
wrote: It's figured wood and my straight knife jointer and planer were creating considerable tear-out on the dry wood dispite taking even the thinnest passes. I read a few posts on this NG about wetting the board to soften the grain. It worked really well too; zero tear-out and only a little, what I guess you'd call, scuffing of the grain, nothing a scraper can't fix. Thanks. When wetting a board to reduce tearouts you only need to spray the surface. I use a mixture of water and rubbing alcohol based on a recommendation from someone on the wreck. I keep a spray bottle near my planer and only have to spray every other pass to keep tearouts to zero. Spray on, wait a few seconds until the wood wets and then wipe off the excess - it isn't enough to warp a 3/4 inch board (1/4 inch maybe but then I spray both sides to keep things in balance). TWS |
#11
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Help with removing bow
Thanks. That's nice to know. I wasn't sure how much water to use. I'll
try less (and the alcohol mixture) when I run them through again in a few days. |
#12
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Help with removing bow
Did you wet and plane both sides? If not there is your problem. In my
experience, using weights to remove bow is a waste of time. Dave |
#13
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Help with removing bow
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#14
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Help with removing bow
I did wet and plan both sides. Interesting though, I never stopped to
consider how wetting/planing just one side might effect the wood. Good to know I shouldn't waste my time with weights. |
#15
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Help with removing bow
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