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DIY IKEA Lack Rack - Preparing the legs?

We are pulling together the parts to build my daughter her first audio rack on the cheap. Another post here about wooden racks brought to my attention some of you who have built racks from IKEA Lack tables, and I became very interested. I already have experience assembling an IKEA wall cabinet for my vinyl, so know that their composite materials are quite strong.

For the rack, you stack the tables up after cutting the legs to size that become your shelves. I want to spike the bottom of the legs, so that they stack up that way. The issue, is the core of the legs are hollow with inside dimensions of 1.75" x 1.75." Dimensional lumber like a 2"x 2" is only 1.5." My idea was using stock square lengths of turning wood that you can get 1.75" x 1.75.

Should I fill the entire length of the legs with the wood, or just insert a shorter piece into the bottom of the legs for the spikes? One of the benefits that's been said about the IKEA composite materials is low resonance even though it's strong. So, will adding a full length of wood to the core of the legs affect the resonance properties? I can go either way.
Kenny
kennythekey
kennythekey OP
593 posts
 
B, That's a great idea using epoxy as a filler. The only downside would be the amount required. I will have twelve legs that average 7" each. Except, for the fiberboard inserts at the ends there's probably 5" of cavity in each leg, so 60" total. That's a lot of epoxy. What do you think about using sand instead?

For the bottom base, we'll be using Herbie's Giant threaded Isolation discs, so that's where we splurged. The legs are getting spikes.

My daughter already got the IKEA tables, so we'll stick with those. Thanks for the Besta suggestion.
Kenny
gdnrbob
4,494 posts
 
Kenny, can’t you cut the fiberboard to be 1/8" smaller than the leg? That shouldn’t require too much epoxy.
I was thinking of filling the leg with wood or fibreboard.
Those legs should be pretty firm. Maybe put some in the shelf,too.
B
Hmm, I wonder if you could
 make an epoxy slurry with sand and fill the legs with that.
kennythekey OP
593 posts
 
Now, I get ya B!

I wasn't going to try to find fiberboard to fill the cavities, because it only comes in sheets (I think). I was going to use wood turning stock that would perfectly fit the 1.75" x 1.75" cavities. That got me started to wonder if wood, like soft maple for example, would resonate more than the original fiberboard legs that were used in the past Lack tables. And, what the good reviews that I read are based upon.

Now, I'm pondering if just leaving the cavities hollow, but caped, would be just as good as anything you could fill them with. Obviously, I don't have much knowledge about resonating materials, so why I'm stumbling around.
Kenny
gdnrbob
4,494 posts
 
The fact that the shelves are filled with corrugated fiberboard seems to make having non resonating legs a non issue. 
As this is a quick down and dirty solution, I would try to get the legs to accept the threaded discs and then put some other isolation products under the components. 
It's never going to be as good as a purpose built rack, but it should do the job. FWIW, I try to not get too caught up with making things perfect. It might make a
 difference, but usually nothing earth shattering.
B
kennythekey OP
593 posts
 
B, Yes it's easy to overthink this at this price point. Thanks, for your input.
Kenny
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