How to remedy cupped boards?

[moji]

I got some tanguile 1" thk boards for boxes im supposed to make. When i started to cut i noticed the board had developed cupping.
http://i5.photobucket.com/albums/y173/Mojito00/P6270996.jpg

What is a usual remedy for cupping? Planing the boards is my last resort as it will result in a big reduction of thickness as these are just 3/4" thk.

[timber715]

to get maximum yield, cut the pieces to lengthwise and glue back once sides are squared.

[moji]

What if i leave the convex side under the sun? Will that level it back?

[timber715]

What if i leave the convex side under the sun? Will that level it back?
cant answer you that, but no matter what I did with my previous boards, it never straightened. it is the stresses in the wood that makes them warp, imho, you might be able to correct it in a way, but the stresses in the wood will bring it back to warp.

[moji]

Im so pissed that the boards turned out that way.. its already quartersawn, kiln dried wood. Maybe the recent rains had something to do with it?

[timber715]

how were they stored?

[moji]

they were stored lying down, one on top of the other...do you think if i stickered them it would have made a difference?

[timber715]

they were stored lying down, one on top of the other...do you think if i stickered them it would have made a difference?
Yes, I believe it would. drying the sides faster than the center could produce that.(I think :p)... stickering would make them dry faster and more even imo...

[moji]

Regarding that suggestion of yours to cut it up into 1" pcs, what method of cutting do you suggest? Im thinking jigsaw..

[timber715]

Regarding that suggestion of yours to cut it up into 1" pcs, what method of cutting do you suggest? Im thinking jigsaw..
what is the width of those boards anyway? seems you only need to cut them in half to fix that cupping... or twice if cupping is that bad.

[moji]

Its a 1" x 10" board..

[timber715]

this is what I meant, cutting lengthwise reduces the cupping on each board. squaring the sides before gluing them back to place reduces the waste it will produce and improve the yield.
the pictures are a bit exaggerated though...
http://i865.photobucket.com/albums/ab219/timber3715/7-1-20101-14-19AM.jpg

[moji]

With that method, how do i square the edges if the cut piece has still a bit of cup to it?

[timber715]

With that method, how do i square the edges if the cut piece has still a bit of cup to it?
usually I reference from one side (the dome side) then I handplane it until I am happy... ;)

[timber715]

using your picture, notice the lines I drew left the boards flat... gluing them back with squared sides will leave you a squared board or very close...
I would cut them this way. of course it is so much easier on the ts :rolleyes:
http://i865.photobucket.com/albums/ab219/timber3715/7-1-20101-37-55AM.jpg

[moji]

ok..i'll try that if exposing it to sunlight doesn't work..

[moji]

using your picture, notice the lines I drew left the boards flat... gluing them back with squared sides will leave you a squared board or very close...
I would cut them this way. of course it is so much easier on the ts :rolleyes:
http://i865.photobucket.com/albums/ab219/timber3715/7-1-20101-37-55AM.jpg

hahah i was already imagining cutting it on the ts...

[timber715]

ok..i'll try that if exposing it to sunlight doesn't work..
goodluck... heheheh

[violaine]

you dont have to cut the boards lengthwise..think of what made them cupped in the first place..there is still moisture in there (even if they are kd) and when you exposed them to sunlight/heat, they cupped...a kd isnt 100% dry.

what you do is wet them and stack them again flat supported by sawhorsespreferably (or just on the floor) and in an area where they can be dried with domes butted against each other.. get some clamps..wait for sometime and then inspect.

i did this on a cupped 1 x 12 boards..but it was last summer.
(but i reckon this might not work out during the wet season...mine didnt flat out but at least the cupping became less.

one advantage, you dont loose the symmetry of the grains.

[moji]

you dont have to cut the boards lengthwise..think of what made them cupped in the first place..there is still moisture in there (even if they are kd) and when you exposed them to sunlight/heat, they cupped...a kd isnt 100% dry.

what you do is wet them and stack them again flat supported by sawhorsespreferably (or just on the floor) and in an area where they can be dried with domes butted against each other.. get some clamps..wait for sometime and then inspect.

i did this on a cupped 1 x 12 boards..but it was last summer.
(but i reckon this might not work out during the wet season...mine didnt flat out but at least the cupping became less.

one advantage, you dont loose the symmetry of the grains.

I actually did not6 expose them to heat. I think it was the rain and humidity that did it.

How wet did you get the wood before you clamped them together?

[violaine]

i clamped them flat first then i sprayed a bit of water in the cupped areas and around it..better if you can apply heat..in this time of year, i am thinking of a 100 watt bulb..hmmm. getting expensive now..haha

[beebeenator]

how about chucking it inside a conventional over?

[timber715]

how about chucking it inside a conventional over?
shortly after you can invite us for barbecue... ;) :)

[violaine]

and a beer or two..:p

[beebeenator]

hahahahaha beeer

bawal ako nun eh.... uric acid and prone to gout.... all my bros have it na... iam just a gout deposit victim in waiting :)

[timber715]

sige, coke na lang sa yo.. hahahaha :p :p :p :confused:

[moji]

Oh that's too bad..your diet is limited too?

[violaine]

hey bee,

yeah i enjoyed beer but it was before..couple of them the most but me too inherited the genes for gout..

but hey, all foodstuffs have some purines in them..just some of them have more and some much lesser.

and the migraine..beer is worse to cause migraine attacks...and i have migraine..another huhu

[timber715]

hey doc, wassup?