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Need help - warped cutting board!

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Forum topic by lumberjuniorvarsity posted 08-21-2016 06:07 PM 487 views 1 time favorited 18 replies Add to Favorites Watch
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lumberjuniorvarsity

66 posts in 360 days


08-21-2016 06:07 PM

So i just finished a walnut and purple heart end grain cutting board, and I had read that leaving the board in the sun will bring back some of the purple in the purple heart. So I left the house this morning with the sanded but unfinished board in the sunlight, and I just returned to find the board severely warped.

There was no moisture on the board and no finish applied yet. The side of the board that was being hit by the sun is now concave.

So my options are

1) Flip the board over and see if it warps back.

2) Remove it from the sunlight and see if it warps back.

3) Something else?

Please help!


18 replies so far

View DirtyMike's profile

DirtyMike

461 posts in 367 days


#1 posted 08-21-2016 06:19 PM

got any pictures? how long did it take you from stock to finished product?

View lumberjuniorvarsity's profile

lumberjuniorvarsity

66 posts in 360 days


#2 posted 08-21-2016 06:32 PM

I jointed and planed partially last Tuesday, finished planing Thursday, finished assembly yesterday.

Also, some dark spots showed up (which you can see in the picture) on the side of the board that was not exposed to the sunlight.

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lumberjuniorvarsity

66 posts in 360 days


#3 posted 08-21-2016 06:59 PM

I just pulled it out of the sun cause I need to leave the house again, and I could hear it cracking. I can’t see any cracks, but I heard and felt it.

Too much heat.

Aaaargghhh!!!!

View Aj2's profile

Aj2

692 posts in 1263 days


#4 posted 08-21-2016 07:04 PM

Why would leave a unfinished piece of wood in direct sunlight.
Of course it will warp.
There’s a lot of baloney about woodworking on the Internet.
It’s a nice looking board.
I doubt if you will get it back to it original flatness.
Good luck

View DirtyMike's profile

DirtyMike

461 posts in 367 days


#5 posted 08-21-2016 07:21 PM

wow, chalk that up as a lesson learned i guess. beautiful piece

View waho6o9's profile

waho6o9

7174 posts in 2042 days


#6 posted 08-21-2016 07:26 PM

Clamp that board with cauls and see what happens in a week.

Good luck now

http://www.mikes-woodwork.com/Cauls.htm

http://www.leevalley.com/US/wood/page.aspx?p=67309&cat=1,43838

View lew's profile

lew

11340 posts in 3220 days


#7 posted 08-21-2016 07:27 PM

I had one warp from setting in water- not what happened to yours- but I put it in the oven at the lowest possible setting for several hours. It flattened back out.

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

View Rick M's profile

Rick M

7923 posts in 1845 days


#8 posted 08-21-2016 07:39 PM

I bet it will flatten out. Try the oven trick suggested by Lew (emphasize lowest possible setting).

-- http://thewoodknack.blogspot.com/

View Kazooman's profile

Kazooman

628 posts in 1417 days


#9 posted 08-21-2016 08:15 PM

I wouldn’t start with the oven. The side towards the sun is no concave. So, either that side dried out some from the heat of the sun or the other side absorbed moisture from whatever it was sitting on. I would let it re-acclimate to the humidity of your shop to see what happens before doing any heat treatment. The cauls should help.

Good luck It is a pretty board. Nice grain patterns.

View lumberjuniorvarsity's profile

lumberjuniorvarsity

66 posts in 360 days


#10 posted 08-21-2016 11:51 PM

Thanks for all the suggestions, guys. Chalk this one up to stupidity/ignorance. I should have thought more about the effect of leaving the board in the sun for 4 hours – especially since that side of our house gets a lot of heat from the sun. Lesson learned (the hard way).

I just checked it, and fortunately it went from having a 1/8” crown to having a 1/32” crown. So now I’m thinking I may just leave it alone. I’m a little nervous about putting it in cauls or the oven after everything I’ve done to it. Plus, it’s a gift for my wife who won’t mind at all that it has a little crown. If I was selling it – it might be a different story.

She wants to use these when she’s cutting on it:

http://www.woodcraft.com/product/158830/chobs-cutting-board-feet-4pc-red-green.aspx

So I don’t think a slight crown will really make a difference.

Once I finish it and put some handles on I’ll post it as a ‘project’, so if anyone cares you’ll see how it turns out.

Thanks again for your advice, I really appreciate it!

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Aj2

692 posts in 1263 days


#11 posted 08-22-2016 12:05 AM

The feet look cool I haven’t seen them before.
I would toss the oven idea and the caul idea in the same pile with sun tanning woodworking.
I would like to suggest that in the future make your end grain boards thicker.
The one you posted look thin for its size.

Aj

View GR8HUNTER's profile

GR8HUNTER

1139 posts in 177 days


#12 posted 08-22-2016 12:20 AM

do lews suggestion …. or caul with a board in the middle of it

-- Tony Reinholds,Pa. REMEMBER TO ALWAYS HAVE FUN

View lew's profile

lew

11340 posts in 3220 days


#13 posted 08-22-2016 03:32 AM

Those are cool cutting board feet!

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

View waho6o9's profile

waho6o9

7174 posts in 2042 days


#14 posted 08-22-2016 03:45 AM

” So now I’m thinking I may just leave it alone.”

Wise ^^

Sealed it up and put those red and green feet on your CB and your done.

Good job lumberjuniorvarsity!

View Rick  Dennington's profile

Rick Dennington

5179 posts in 2659 days


#15 posted 08-22-2016 04:28 AM

One thing about Purpleheart….it will darken on it’s own as time goes along. And when you finally use mineral oil, or salad bowl dressing, etc., you’ll really see the difference in the Walnut and Purpleheart, also….Talk about grain “popping”....

-- At my age, an "all--nighter" is not having to get up and pee...!!!

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