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View lumberjuniorvarsity's profile

Need help - warped cutting board!

by lumberjuniorvarsity
posted 08-21-2016 06:07 PM


18 replies so far

View DirtyMike's profile

DirtyMike

637 posts in 1297 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

87 posts in 1290 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.

View lumberjuniorvarsity's profile

lumberjuniorvarsity

87 posts in 1290 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

2280 posts in 2193 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

-- Aj

View DirtyMike's profile

DirtyMike

637 posts in 1297 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

8652 posts in 2972 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

12775 posts in 4150 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 Woodknack's profile

Woodknack

12814 posts in 2775 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).

-- Rick M, http://thewoodknack.blogspot.com/

View Kazooman's profile

Kazooman

1319 posts in 2347 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

87 posts in 1290 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!

View Aj2's profile

Aj2

2280 posts in 2193 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

-- Aj

View GR8HUNTER's profile (online now)

GR8HUNTER

6109 posts in 1107 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

12775 posts in 4150 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

8652 posts in 2972 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 (online now)

Rick Dennington

6538 posts in 3589 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, happy hour is a 2 hour nap".....!!

View nightguy's profile

nightguy

213 posts in 1057 days


#16 posted 08-22-2016 04:38 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”....

- Rick Dennington

A great signature!!! Reminds me of another one, wife ask hubby “what are going to do today?” He sez “nothing” , she sez, “thats what you did yesterday”, he sez, “ya it is, but I am not finished yet”!!!

View lennyk's profile

lennyk

34 posts in 1227 days


#17 posted 08-22-2016 09:35 AM

it got concave as it dried and shrunk on that side
anytime I leave purpleheart scraps outside in the hot sun they quickly develop
check cracks from the drying

the purple color is activated by uv so you dont really need direct sunlight, just has to be outdoors.
it wont stay bright though, get a little darker but still nice with the oiled finish.

View lumberjuniorvarsity's profile

lumberjuniorvarsity

87 posts in 1290 days


#18 posted 08-22-2016 09:47 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!

- waho6o9

I really wish I would have actually left it alone. But after thinking about it a while I worked up the courage to put it in the oven. BIG MISTAKE. I put it in the oven for 2.5 hours at 170F (the lowest it would go) which did not only not fix the warping, but managed to crack the board in 4 places. Two are along glue joints at the edge of the board, and two are right in the middle of purple heart sections.

I’ve been awake all night just sick over this. I wanted to make this board back in April for my wife as an anniversary gift, but other house renovations got in the way. I finally got to it and it came out great – then I destroyed it. I’m not sure what to do now. I just got up (3:30am) and looked at it and the cracks have closed up to where I can just barely see them. I’m thinking that will actually make any kind of repair even harder – I was thinking about getting some epoxy to fill the cracks and re-clamp. Now I don’t know.

The ‘lesson’ continues…

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