Instructables
Picture of Wobble Seat
Sitting all day is bad for your health. People with sedentary jobs have a much higher chance of heart disease than those who move around more. The wobble seat provides a solution similar to the Locus Seat deigned by Focal Upright Furniture (www.focaluprightfurniture.com) without breaking the bank.

This seat should be used with a stand height desk or drafting table. (Note the tabel in the first photo of the seat in use is not quite high enough, sorry.)
 
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Step 1: Materials

Picture of Materials

Step 2: Cut

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Step 3: Mix

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Step 4: Pour

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Step 5: Level

Picture of Level

Step 6: Bolt

Picture of Bolt

Step 7: Use

Picture of Use
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zef2000 made it!20 days ago

Thanks. This was a great instructable. I really appreciated the level of detail in the steps. To prevent slippage and floor damage, I cut up an old basketball, inverted it and made slits to make it fit. I used Plast-Aid as the adhesive since it starts out as a liquid and then becomes a solid. Been about a week and it seems to be holding up well.

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CobyUnger (author)  zef200020 days ago
Great job! The basket ball addition looks fantastic. Thank you so much for sharing.
JFARNSWORT2 months ago

You might consider leaving the basket ball form on instead of trying

to coat the concrete,

good traction and during basketball season all will think you cool.

clyde frog made it!2 months ago

I'm simply re-posting these pics since I just found the 'I Made it!' button :P

My stool is maybe a year old now and it still works great.

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wsecomp made it!3 months ago

This was pretty easy and straightforward to do. My wife found a set of kids crutches for $5, and I bought a bowl from the dollar store and the bike seat from WalMart. We live in a small town, so their seat selection is pretty limited. Due to the weight of the seat, I offset the location of the crutch to compensate. I painted everything to make it look a little more "office-ish".

I can understand why you would want the noseless seats. The nose of the seat is not exactly comfortable in the leaning position. (grin) I'm using the seat in the backwards position and it works pretty well.

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CobyUnger (author)  wsecomp3 months ago

Looks great! I hope it is working out well for you. I suggest ordering the Schwinn noseless saddle if the one you have isn't working out.

http://www.kmart.com/schwinn-no-pressure-bike-seat...

granolape8 months ago
Images of wobble seat with the adjustable height desk I made out of a hydraulic printer stand and some plywood.
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CobyUnger (author)  granolape8 months ago
That looks fantastic. Nice job! I promise it will be much better with a real seat on it. The one I used costs about $15 from Walmart. The noseless bike saddles work better than a traditional style seat. I have been casually looking for a tractor seat for mine. That would be ideal.
granolape8 months ago
Thanks for posting this! I just made one of these little dudes last night. came out really well. I ended up cutting a basketball in half and inverting one side into a metal mixing bowl (that just happened to fit perfectly) to help it keep the nice flat bottom I wanted. Worked great. I also took someone's suggestion in the comments and put 4 carpentry screws through the basketball to tie the ball to the concrete. I still need to find a better seat (hoping to find a free old cruiser bike seat), but this works surprisingly well for now.
hsanford10 months ago
This is totally awesome! I hope you have a patent (or a pending one), you could really cash in on this. I haven't seen something so unique, so cool, and even beneficial in a very long time. You should be very proud!
CobyUnger (author)  hsanford10 months ago
Thank you so much for your comment. I am not planning to patent this one. Focal Upright Furniture makes seat similar to this one that probably holds some restricting patents. This design is for people like me who can't afford their awesome products but would like to enjoy the benefits.

http://www.focaluprightfurniture.com/
hsanford CobyUnger10 months ago
Darn! That's too bad! I've never seen anything like this and I think it's amazing! I'm with you, I'll make it before I'll pay that kind of cash! I had my desk at work lifted so that I can sit or stand due to a couple of back surgeries and I'm going to try to make this one for sure! I'll send pics when I'm done.....gotta figure out where to find a crutch. :o) Thanks for sharing your skills with the rest of us....you did a fantastic job!
CobyUnger (author)  hsanford10 months ago
If you do make one first read some of the comments below. Casting the concrete base in a basketball was a fantastic idea and makes the base stick to the floor better. If you can find something slightly bigger than a basket ball it might be even better.

Thanks again for your appreciation.
This ought to be one of the best projects here on Instructables. Simple instructions anyone could follow, readily available materials, very basic tools but a very innovative and useful product. Cheers!
CobyUnger (author)  diestraysiniestra1 year ago
Thanks. Let me know if you make one. I'd love to see your photos.

-Coby
clyde frog1 year ago
(Preface: Instructables won't allow me to 'reply' because of a Captcha bug. So, I have to post a new comment every time.)

Here are 2 pictures.

Looking forward to seeing your standing desk. I'm also working on converting my computer desk to have an adjustable height. I can also share a picture of that when it's done.
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CobyUnger (author)  clyde frog1 year ago
That looks great. It's so much fun seeing people make things I designed.

Thanks so much,

-Coby
clyde frog1 year ago
I also used an inside-out basketball but the weight of the concrete conveniently flattened the very bottom of the hemisphere, creating a ~5" diameter flat plane. So, it has no problem staying upright when not in use.

I didn't use water or sand as was suggested by others. The ball was able to maintain it's shape aside from the added bonus of the flat I just mentioned.

Thanks for sharing this great project.
CobyUnger (author)  clyde frog1 year ago
I'm so excited that you actually made one! would you please post a photo? I would love to see how it turned out. If all turns out as planned I will be making a desk to match in the next few months and will post instructables on that too.
I like the idea, in fact I wish I'd had a couple in my lab when I was in IT support.
The only thing that concerns me is that on some floor surfaces it could be prone to sliding away, I would hate for all the health benefits to be cancelled out by sudden & painful contact with the floor :-(
Perhaps some anti slip covering suitable for the surface it's to be used on would be worth considering.
CobyUnger (author)  Nostalgic Guy1 year ago
I tried PlastiDip but it doesn't stick very well to the concrete and tends to get dusty. If you have a good coating suggestion that would be great. That is definitely something I want to address with future versions. The concrete as is works best on carpet.
What if you lined the mold with a cut open basketball? might take some creative cuts to get it to lay flat in the mold.
CobyUnger (author)  jatoha1 year ago
That is a fantastic idea. I don't think it would even need to lay flat. A full hemisphere would work great. The only challenge there is stabilizing the basketball when pouring the concrete.
Here's what you do: You make two concrete molds with the basket ball hemisphere in between.

Make a box big enough to hold the entire molding. Fill the bottom with concrete and then press the basket ball (covered in vasoline or other mold release) into the bottom. Then pour the rest of the concrete inside the hemisphere. It should expand into a neat hemisphere. 

Mark an alignment mark on the ball and the cement because when you remove it the ball will almost certainly shift and you want it exactly back where you left it. You might find that simple compression will keep it in place during use but you'll probably want to use flexible vinyl glue to make it snug. 

Hmmm, just now it occurred to me that you could section the top of the basket ball like an orange and then fold those over the concrete. If put bolts in the concrete while its wet, you could then just screw down a holder of some kind. Would look ugly but it would work.
CobyUnger (author)  shannonlove1 year ago
I casted a version of the seat with an inside-out basket ball on the base. It wasn't quite heavy enough to stay upright when not in use. I think I'll try again soon with a bigger ball or possibly slightly different geometry.
You could press the ball into sand before pouring to hold the shape.
CobyUnger (author)  Jural1 year ago
Yeah that would be really good. My friend suggested partially submerging it in water too.
It would look cool, too. And it would be amusing if someone attempted to pick it up to bounce it.
I'm thinking concentric rings of rubber, perhaps you could experiment with strips or panels cut from car tyres or even the tread area of mountain bike tyres, it could be fixed with contact adhesive (I wonder if there's a Gorilla Glue contest coming any time soon).
Alternatively if you were to cut car tyre strips with a chamfer & fix them into the mould before pouring the concrete they would stay in quite well on their own, cycle tyres may be even easier as you could simply cut it into sections complete with sidewall & beading fix them into the mould with a low tack adhesive & pour concrete into the lot.
CobyUnger (author)  Nostalgic Guy1 year ago
That would be real cool. If I make another version I'll try that out (no time now, really busy).
Just a thought, but you could try spray-able truck bed liner, I believe some brands have a rubbery texture and that stuff is made to REALLY stick.
CobyUnger (author)  swainetchr1 year ago
Cool Idea. Thanks
If you can find them, I've got an antique dentists stool that works almost just like this.

It's actually a bit more like a ball joint on a car - the base is flat with a socket on top, and a ball fits into the socket.

Perhaps you could alter this design to add a concrete cup beneath - then you could simply put rubber non-skid feet on the bottom of the cup.
Simple but amazing!!! Awesome project Coby!!!!
psauvignac1 year ago
Nice idea !
Do you have measures of the Concrete basis please ? Il would try to make it in autocad to fit to my taste :)
Thank you !
CobyUnger (author)  psauvignac1 year ago
The concrete section is about 12 inches across and 5 inches tall.
nicofrog1 year ago
Totaly AWESOME dude dudetes !
fjr_scoot1 year ago
An elegant design. Well Done! I like the pickup bed liner idea for a concrete coating. I'd also consider a flat spot on the bottom, so it "wants" to stay upright when not in use
FryGuy20861 year ago
Love it! I will be making one of these. As soon as I saw the exposed concrete base, I thought about slippery floors (which you discuss). I'm thinking about using this technique http://www.instructables.com/id/DIY-Kettlebells-for-under-10/, for the concrete mold to solve the slip issue. Again, kudos on the idea.
CobyUnger (author)  FryGuy20861 year ago
Great. I would love to see photos o your version when it's finished. The instructions on the kettlebells are great! Thanks so much.
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