Question on wood movement on a round table - Page 2 - Woodworking Talk - Woodworkers Forum
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post #21 of 26 Old 10-30-2019, 11:14 AM
where's my table saw?
 
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Afraid of wood expansion or contraction?

Just use dry wood!
https://www.youtube.com/watch?time_c...&v=cBBPIxjgBuc



The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)

Last edited by woodnthings; 10-30-2019 at 02:08 PM.
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post #22 of 26 Old 10-30-2019, 12:35 PM
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Go for it. Maybe it'll fail in a couple months, or a few years, or never. Regardless, you'll have gotten a whole lot of experience trying to make all those cuts accurately enough to work.
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post #23 of 26 Old 10-30-2019, 02:19 PM
where's my table saw?
 
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Exclamation Cutting precise wedges .....

Quote:
Originally Posted by gj13us View Post
Go for it. Maybe it'll fail in a couple months, or a few years, or never. Regardless, you'll have gotten a whole lot of experience trying to make all those cuts accurately enough to work.

This site has some interesting approaches on cutting precise angles:
http://waterfront-woods.com/Projects...discussion.htm
http://www.waterfront-woods.com/Proj...TableBlog.html

Read page 7 Making The Wedges.
This guy made only 8 wedges, and had a great deal of difficulty. He uses a sliding table table saw for the most precise cross cuts:

After making the first pass on the saw, I laid out all 8 wedges, keeping the first 7 joints tight so the entire error would be visible in the eighth joint. I ended up with a gap at the center of about 1/8 inch. This meant that each cut was off by just 1/128th of an inch over a distance of 30 inches. This meant my first attempt was actually 22.515 degrees, or an error of 0.0149 degrees.

THE ANSWER!
Here's what he says about using solid wood for the wedges:

I don't recall if I mentioned this earlier, but you cannot use solid lumber in a radial pattern such as this table. As the wedges expand or contract, the angle would change from the perfect 45 degrees. In the winter, the table would have gaps at the outside, and in the summer it would have gaps in the center. This is why I used the high-density maple plywood as the core material.

So, there it issummed up very nicely. I'll admit that I was wrong, but 8 wedges are way different than over 100 or what ever number this design would require. Building it would certainly settle any and all "opinions" on the self destruction theory.
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The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)

Last edited by woodnthings; 10-30-2019 at 02:53 PM.
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post #24 of 26 Old 10-30-2019, 02:29 PM
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Same here with seeing designs like this in veneer over stable sub. I don't have any real experience with this type of build, but my gut feeling doesn't give much hope to solid wood. I could just see waking up in the night to a big "craaackk!" and finding a tepee where a table once was.

Why not build a smaller version with fewer wedges (for simplicity) and subject it to different environments over time before embarking on the big project?
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post #25 of 26 Old 10-30-2019, 10:14 PM Thread Starter
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Hi All (again)
Just wanted to thank everyone for the input.

I came up with a few complicated reasons why this might work, but I think there may be a fairly simple reason why it won't (even with the hole in the center :-( ). I'll post in a couple of days for closure once I've had a little more time to think it over. Guess it's back to the drawing board...

Regarding the veneer option, I understand this is the reasonable (sane) approach for this type of project, and it can yield some spectacular results... but I'm having trouble giving up the solid wood construction. If I can come up with a redesign that I think will work I'll post it up as well.

All the best, and thanks again!
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post #26 of 26 Old 10-31-2019, 09:27 AM
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Is there a way to build a simple prototype and then run some type of accelerated tests?

I can imagine a basic prototype design, but am not sure about inducing wood movement. Freezer to oven (on warm) to freezer to oven, perhaps? Can you spray a mist to induce swelling from moisture? Steam it when you take a hot shower?
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butcher block table, butcher block tops, joinery, wood movement, wood movement help

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