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Should I be concerned with racking in this standing desk design?

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Forum topic by tcaz posted 04-17-2020 02:10 AM 723 views 0 times favorited 12 replies Add to Favorites Watch
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tcaz

28 posts in 911 days


04-17-2020 02:10 AM

I’m building a 44” tall maple/steel standing desk with steel H frame legs (photo below) that measure out to be 39.25” tall and 24” wide. Legs are made out 1.5”x1.5” steel tube.

The table top will be 48” x 28” x 1.75” maple butcher block top and there will also be a 1.25” maple panel/lower shelf fastened to the lower leg rails. Lastly, legs will be on 2-3” casters.

So my question- Is there any potential for racking with the legs being so tall or will the fastened table top and lower shelf prevent that? I might also be adding drawers under the table making it further top heavy.

Any input is appreciated!


12 replies so far

View Woodknack's profile

Woodknack

13557 posts in 3458 days


#1 posted 04-17-2020 03:48 AM

If the lower shelf is firmly attached it might be enough. If it’s just screws into the top holding it then it will rack, screws into wood won’t resist that much leverage.

-- Rick M, http://thewoodknack.blogspot.com/

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tcaz

28 posts in 911 days


#2 posted 04-17-2020 04:13 AM



If the lower shelf is firmly attached it might be enough. If it s just screws into the top holding it then it will rack, screws into wood won t resist that much leverage.

- Woodknack

I did plan to screw to the top with 2” screws. Oversize holes for movement. Plan on asking the fabricator to add flatbar to the lower rail for lower shelf to screw into.

What do you propose as an alternative or safer way to go about it?

View bondogaposis's profile

bondogaposis

5986 posts in 3430 days


#3 posted 04-17-2020 04:19 AM

I did plan to screw to the top with 2” screws.

That is a little risky on a 1.75” thick top.

-- Bondo Gaposis

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tcaz

28 posts in 911 days


#4 posted 04-17-2020 04:23 AM



I did plan to screw to the top with 2” screws.

That is a little risky on a 1.75” thick top.

- bondogaposis

Lol, yes I’m aware that doesn’t add up :) It’s 1.75” give or take. and the flatbar on the top of the legs is ~1/4” or so.

View CaptainKlutz's profile

CaptainKlutz

4440 posts in 2573 days


#5 posted 04-17-2020 04:32 AM

Some ideas FWIW:

One way to reduce racking between legs, is to remove the single pivot point mounting for the lower shelf on each leg. Weld a 8-10in wide plate to top of cross bar, that is hidden under shelf. With 2 rows of screws 6-8in apart, will be harder for leg to rotate or move side to side under the top. Also suggest the plates on top of legs be 8-12” wide. The further apart the screws attaching the top and shelf, the more force it takes to create racking movement as steel plate is pressing into wood in one side, and spread the force across additional fasteners on opposite side.

Another solution is to add an wood apron to table. By having at least 3in wide support, running perpendicular to the top with at least mounting points to legs, you further restrict rotation about the pivot points.

If working from one side is part of the plan, could add 2 steel cross pieces on back upper/lower side, and one under table top near front; and racking issue disappears. Since top is only 28in wide, the entire assembly will still roll through a standard 32in door way?

Best Luck.

-- If it wasn't for bad luck, I wouldn't have no luck at all, Doom, despair, agony on me… - Albert King - Born Under a Bad Sign released 1967

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tvrgeek

1859 posts in 2728 days


#6 posted 04-17-2020 10:07 AM

One could extend your top plates further for even more leverage.
If adding a lower shelf, then support it with a pair welded boxes between the two lower leg braces.

View Ger21's profile

Ger21

1100 posts in 4209 days


#7 posted 04-17-2020 01:06 PM

It’s definitely going to sway side to side. How much depends on how rigidly the top and shelf are mounted, and how much force is applied.

-- Gerry, http://www.thecncwoodworker.com/index.html http://www.jointcam.com

View Redoak49's profile

Redoak49

5236 posts in 3067 days


#8 posted 04-17-2020 01:19 PM

Yes, it will sway. With casters, you will be rolling and a caster will hit something and it will rack. I think you need a diagonal someplace.

View tcaz's profile

tcaz

28 posts in 911 days


#9 posted 04-18-2020 12:52 AM

Thanks for everyones suggestions. I talked to a welding buddy of mine and he’s going to add some additional bracing for me.

View CaptainKlutz's profile

CaptainKlutz

4440 posts in 2573 days


#10 posted 04-18-2020 01:14 AM

Interesting. Should reduce racking.

Have you ever used a stand up desk with shelf nearly same size as top?
I have, didn’t like it all? Constantly banging my shins.
Suggest you check out the designs on some commercial stand up desks before you mount that lower shelf.

Best Luck.

-- If it wasn't for bad luck, I wouldn't have no luck at all, Doom, despair, agony on me… - Albert King - Born Under a Bad Sign released 1967

View tcaz's profile

tcaz

28 posts in 911 days


#11 posted 04-18-2020 04:07 AM


Interesting. Should reduce racking.

Have you ever used a stand up desk with shelf nearly same size as top?
I have, didn t like it all? Constantly banging my shins.
Suggest you check out the designs on some commercial stand up desks before you mount that lower shelf.

Best Luck.

- CaptainKlutz

I get it but customer request for”lower storage shelf” so….

View Woodknack's profile

Woodknack

13557 posts in 3458 days


#12 posted 04-18-2020 06:49 AM



Thanks for everyones suggestions. I talked to a welding buddy of mine and he s going to add some additional bracing for me.

- tcaz


Looks like a good idea.
I bet you get a call back wanting the lower shelf to cover only the back half but at least you can charge for it.

-- Rick M, http://thewoodknack.blogspot.com/

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