Variable height desk: replace hand-crank with some kind of electrical motor


First time poster here, sorry if I'm misplacing this. I have near zero knowledge of engines, though I understand physics, at least from my civil engineering college years.

I bought a variable height desk from IKEA (Skarsta model), which has a 12cm radius hand crank (see photos) that ends in a hexagon shape, h=6mm (so diameter around 6,93mm).

This hand crank works fairly easily, needing little effort to crank the table up, with ~45kg of weight on it (it's supposed to go up to 50kg).

So basically I was thinking if there was a easy, cheap and safe way of automating this with some sort of electric motor (I even looked up those Lego Technic motors!).

Any suggestions?

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Techack2 years ago

I have cut the 6mm allen key supplied with the kit and use it with a cheap drill from Home Depot. I work just fine.

I don't care about the look since it is a home office.

Good luck.

acn (author)  Techack1 year ago

I missed your post [quite] a while back but this is a pretty good idea. Thanks for sharing

acn (author)  acn1 year ago

One thing though, how much load do you have on the table?

KevinW1931 year ago

Techack - I'm thinking of doing the exact same, but maybe with a wired drill I don't use any more. How did you attach the drill to the Skarsta?

If you do want to go a bit smaller in size than a drill:
A lot of cars use motors to move the seat back and forth.
Some of them work the same way as your drill, a geared motor spinning a threaded rod quite slow - they are easy to mod for this.
Another great option if you want to stick to mains power is a motor for a spit roast, you know these tiny boxes that spin your deer over the bbq (ok, take the smaller version please!!).
All they need is a square axle that connects to your drive mechanism and if you buy a cheap kit you could cut the spit rod as without the motor it has no use on your bbq anyway ;)
And if you want to go totally overboard you can also use a Nema17 motor with a nice reduction gearbox and an Arduino to set the table height accurately by the mm, even with presets if you want.

I'm now using a little Black & Decker cordless driver. At first I thought it wasn't going to be powerful enough, but it does the job fine. Even faster if I push the table up while it's raising it. Going down is no problem at all.
Because of the tight space, the drill is wedged there, so there's no need to attach it. Beautiful.
Techack2 years ago
houchaowei2 years ago

I'm unable to find how much does a side window weight, but I fear it's much less.

Get a motor that drives the seat in a car.
They are still 12, but with a high power gear box and lots of torque.
Best is their size, which makes them ideal for such things like moving a table top.

Toga_Dan2 years ago

automobile window motor assembly. Junkyard part is likely good enough.

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