Help me, please. Torsion in Live Edge Pedestal Table

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Forum topic by Danmadethat posted 11-27-2018 07:18 PM 518 views 0 times favorited 5 replies Add to Favorites Watch
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3 posts in 785 days

11-27-2018 07:18 PM

Topic tags/keywords: pedestal table base cherry torsion wobble design structural design question help

Hey there

Been woodworking for about five years now. This is my first originally designed table and chair set, crafted from some local cherry.

After all was said and done, it has this torsion issue. When movement is initiated from the side or top, this “spring” action occurs.

Here’s a short video explaining my issue.

Really appeciate any help. I’d love to
a) Come to a solution on how to add/subtract from this existing piece to stablize the shake
b) know why it’s happening so I can avoid this in future designs of pedestal tables

Watched here from afar for years, this is my first post. Highly appreciate any input-


5 replies so far

View torus's profile


518 posts in 1383 days

#1 posted 11-27-2018 10:20 PM

From pure physics, I think it is your pedestal.
It is quite easy to test – put 3 quick-grip clamps around in the middle of the height of the pedestal, from edge to edge. If my theory is correct you should see that vibration is reduced

More experienced LJ’s can give you advice how to beef up the pedestal.

-- "It's getting better..." - put this on my RIP stone!

View Danmadethat's profile


3 posts in 785 days

#2 posted 11-27-2018 10:30 PM

Thank you, torus. Will give it a go

View Davevand's profile


230 posts in 1806 days

#3 posted 11-27-2018 10:42 PM

I also think it is your pedestal. It looks really nice but much too small for the size of your table top. The triangle center piece is the only thing supporting the twisting action.

View Manitario's profile


2816 posts in 3853 days

#4 posted 11-28-2018 12:15 AM

When you twist it, the force is through the thickness of the live edge supports. Similar to if you had a thin board and you held it by opposite corners and tried to twist it. So, given the size of the top, when you apply a rotational force to it, it puts the torque through the thickness of the supports, which are not thick enough to prevent the twisting.

Not sure how I’d fix it though without a full re-do of the base using thicker live edge slabs.

-- Sometimes the creative process requires foul language. -- Charles Neil

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3 posts in 785 days

#5 posted 11-28-2018 02:16 AM

So…input from a couple of structural engineers say a thicker “stem” piece will do the trick. A couple more said to reinforce the triangle at the top, another said to attach a metal plate to the center of the triangle and attach the top to it, taking forces off of the “spokes” created by the triangle.

Thinking I will do a full re-do using a thicker pedestal piece to run the slabs from—at that point, the slabs will be more for show than structural support, and the structural support will be the stem piece alone.

Going to try adding a couple of metal brackets to the triangle and see if that helps. I’d really like to keep the aesthetics (within reason) and gain stability no matter the ultimate route.

Thanks for everyone’s input on this. Really, really aprreciate it


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