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Problems with Large Cutting Board

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Forum topic by jasoncarpentry posted 1005 days ago 2189 views 0 times favorited 5 replies Add to Favorites Watch
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jasoncarpentry

111 posts in 1250 days


1005 days ago

A few months ago, I asked for input on a 22” x 18” cutting board that was warping. After a few attempts, I’ve sorta fixed this one, but now I have a request for another, and I want to get it right from the begining. I’m using 3/4” thick x 1 1/4” wide pieces, alternating maple and cherry. For the first one, I used no internal stiffeners (I’ll explain below) and Titebond II glue.

I’ve seen plans where the pieces were “threaded” onto two pieces of 1/2” or 3/4” dowels. This helps w/ alignment during glue-up, and supposedly helps prevent the board from warping. For my new board, I plan to use polyurethane (Gorilla) glue and, instead of wooden dowels, I’m considering steel rods or steel all-thread. These would be either 1/2” or 3/8”, and the end slats would have blind holes to cover the ends of the steel rods.

What do you think? Is there a possibility of rust, even though the rods will be encased within the board? If that’s a possibility, I can epoxy-paint the rods before assembly. This is sometimes done w/ rebar in certain concrete pads.

-- Jim in Tennessee


5 replies so far

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jasoncarpentry

111 posts in 1250 days


#1 posted 1004 days ago

Rick-
Thanks for your response. I went to the link you posted, but I can’t find any construction details. But I hear you; I need to check the wood with a moisture meter, then use Gorilla Glue.

-- Jim in Tennessee

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jasoncarpentry

111 posts in 1250 days


#2 posted 1004 days ago

Rick-
One other thing: You said that my ”...original problem is from the wood wasn’t all dried the same.” I don’t think this was the case. All of this wood had been stickered and stored in my humidity-controlled shop (i.e., 60% RH) for several months. Based on my experience and your input, I’m beginning to think that the problem on this particular board was not using Gorilla glue in the first place, especially since the top of the board stays wet much of the time. And since it’s got “feet,” turning it over and using the other side isn’t an option.

-- Jim in Tennessee

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MoshupTrail

287 posts in 1076 days


#3 posted 1004 days ago

Which way is it warping? up/down or side-to-side?

I’m also wondering about the wood choice: Maple is very tight grained and does not absorb moisture quickly. I think cherry is much more absorbent. (I’ve never made a cutting board – so maybe that’s a common combination and works for others?) So how are you sealing this – to prevent moisture absorbtion which would cause uneven swelling? What about grain orientation? All grain vertical?

A look at Rick’s link – they use 100% maple and I saw a comment that they always use vertical grain. (what they call “chopping blocks” are end grain)

1. a urethane glue will not weaken when wet
2. use stainless rods and nuts if you go that route – overkill perhaps, but rock solid

-- Some problems are best solved with an optimistic approach. Optimism shines a light on alternatives that are otherwise not visible.

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MrRon

2715 posts in 1839 days


#4 posted 1000 days ago

A cutting board needs to stand up to how it will be used. Cutting boards are subjected to moisture, heat and sometimes in ways they were not intended. I think 3/4” is pretty thin for a sturdy board. Rick I has it right. Butcher block construction uses end grain as the working surface. If you use it for chopping, end grain is the only way to go. For cutting and slicing, I would still go with the end grain block or plastic. Those alternating wood boards may look nice, but they weren’t designed to stand up to heavy duty use. I would treat them as decorative and maybe use them for slicing and serving cheese. To keep one of those boards from warping, never wash it, but only wipe it down with a damp cloth and dry it. This precludes you from using it for cutting, slicing or chopping meats, poultry, fish or vegetables. Once the surface is breached through knife cuts, the woods will be subject to warping.

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jasoncarpentry

111 posts in 1250 days


#5 posted 998 days ago

I realize that posts come and go so fast here that the responders may never see this, but …

As always, thanks for your comments & questions. I’ll attempt to answer them here:

1. MrRon: I misled you on the board’s thickness. It’s not 3/4”; it’s more like 1-1/4”. 3/4” was the thickness of the individual pieces before I turned them on edge and did the glue-up. But the site that RickL linked to sells boards w/ minimum thicknesses of 1-3/4”, and some are as thick as 3”. IMHO, the thicker the board, the less likely it is to warp.
2. Everybody: Yes, I’m also convinced that end-grain boards are the best, but I’d like to think that edge-grain boards still have a place.
3. RickL: I Googled Jowat glue, and I agree that it looks like a superior product compared w/ Gorilla glue (GG). But it’s kinda discouraging to learn that GG is already somewhat obsolete! But how come Marc (who has a good cutting-board video on Lumberjocks) is still using Titebond II?
4. Everybody: Before the board was ever used, I finished it in the standard way: I flooded it w/ mineral oil, wiped it in, and then followed up w/ a mixture of mineral oil & paraffin. Did this on both sides. So I’m convinced that the finish was thorough, and wasn’t the cause of the warping.
5. Everybody: It looks like you all agree that a board this size needs to be used (i.e., wetted) equally on both sides or it’ll warp.
6. Everybody: I still haven’t given up on the idea of reinforcing a board w/ steel rods. As an engineer, I understand the risks w/ different degrees of expansions due to heat, moisture, etc. But hey, it’s a challenge, and you’ve gotta admit that the idea is kinda unique (stupid?)

-- Jim in Tennessee

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