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Chess board on a substrate

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Forum topic by Don posted 225 days ago 568 views 0 times favorited 11 replies Add to Favorites Watch
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Don

490 posts in 1844 days


225 days ago

Topic tags/keywords: question

Hey folks….

I finished a chess board last year and glued it down to a 1/4” piece of plywood. The board goes through a horrible humidity reaction and 1/2 the board curls up.

I just finished another board and glues it down to a 1/2” piece of plywood and guess what….it curled again.

So, for those of you who do chess boards and perhaps glue them to a substrate, is it the plywood that’s causing the curl in the board or something else?

Thanks….Don

-- -- Don in Ottawa, http://www.donebydon.ca


11 replies so far

View JustJoe's profile

JustJoe

1554 posts in 640 days


#1 posted 225 days ago

I have a checkerboard my grandfather made by overlaying a plywood substrate and edge-banding with solid wood. It’s as nice as the day it was built and he died over 24 years ago. It could be some other problem. Are you covering both sides of the plywood with the same thickness of veneer/solids? Are you using a high-quality plywood or some exterior-grade stuff you pulled out from that pile of trash behind the garage? Are you applying a finish evenly to all six sides when you’re done? What type of glue are you using?

-- This Ad Space For Sale! Your Ad Here! Reach a targeted audience! Affordable Rates, easy financing! Contact an ad represenative today at JustJoe's Advertising Consortium.

View 404 - Not Found's profile

404 - Not Found

2544 posts in 1571 days


#2 posted 225 days ago

JustJoe has it, you need to do both sides to balance it. What is the thickness of the squares?

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Don

490 posts in 1844 days


#3 posted 225 days ago

The first board was 1/2 thick Walnut and Maple on 1/4” plywood (G2S). Titebond II glue used.
Second, and most recent board was Nogal and Maple 3/4” on 1/2” plywood (G2S).

-- -- Don in Ottawa, http://www.donebydon.ca

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404 - Not Found

2544 posts in 1571 days


#4 posted 225 days ago

The plywood won’t change dimensions but the layer of solid wood on top will likely contract causing it to curl up at the edges, especially at those thicknesses. If you could make the chess board pattern from 1/16 stock and do the bottom with 1/16 material with the grain orientation the same, I think you would eliminate the problem.

View hydro's profile

hydro

208 posts in 353 days


#5 posted 225 days ago

This is a great example of how not to design a piece of woodwork, The checkerboard is a cross grain assembly and will expand/contract along the growth rings of the pieces used to assemble the board. This dimensional change creates considerable movement and follows changes in ambient humidity. The plywood is, for the sake of argument, dimensionally stable and constrains the cross grain movement, hence the warping issue. It is an unbalanced construction.

Renners has a good idea on this but the thin cross grain pieces may crack as they shrink in the winter months while the plywood core does not. Personally, I would build the checkerboard out of thicker pieces (3/4”+) and let the entire assembly float in a frame, much like a frame and panel door.

-- Minnesota Woodworkers Guild, Past President, Lifetime member.

View Don's profile

Don

490 posts in 1844 days


#6 posted 225 days ago

Now I just feel stupid….I was using the ply to keep it tight, to do the exact opposite of what happened!

The chess boards with the drawers were all done without a plywood layer on the bottom and I really don’t know why I added it to these boards. Maybe to have a ‘finished’ look to the bottom.

Well, at least no one got hurt….except my pride :(

-- -- Don in Ottawa, http://www.donebydon.ca

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mrg

519 posts in 1601 days


#7 posted 225 days ago

Both sides need to be veneered.

-- mrg

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404 - Not Found

2544 posts in 1571 days


#8 posted 225 days ago

Did you ever make that Darwinizm table Don? How did it turn out?

View BentheViking's profile

BentheViking

1746 posts in 1166 days


#9 posted 225 days ago

the double veneer is my thought too

-- It's made of wood. Real sturdy.--Chubbs Peterson

View RobertT's profile

RobertT

66 posts in 1383 days


#10 posted 225 days ago

Don I made a chess board just like you have described. The only difference is my top veneer is only 1/4 to 3/8 inch thick. My board only has a small twist that you have to be nit picking to see.

View gfadvm's profile

gfadvm

10591 posts in 1292 days


#11 posted 225 days ago

I did a valet top in similar “parquet” fashion glueing the 2×2 oak squares to a 1/8” hardboard substrate. I alternated the grain direction in the squares (right angles to each other). The squares were 1/4” thick and I banded the edges with mitered Jatoba (1/2” square) and no splines. No way this should have worked but it remains flat with no cracks and the miters remain tight.

I have no explanation as to why this worked. Any guesses other than dumb luck?

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

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