Introduction: K'nex Gearbox

Picture of K'nex Gearbox

This instructable will show you how to build a K'nex 1 speed gearbox that will make a motor go faster/slower. This is my first instructable sorry if it is unclear and some of the pictures are blurry.
p.s it is based on a gearbox that I found on Youtube its here if you want to see it.
pp.s Give credit to spoonman192
ppp.s remember to use SANYO eneloop Batterys for the motor.

Step 1: The Base

Picture of The Base

Firstly build the base.

Step 2: The Gears

Picture of The Gears

Now the tricky part, insert the gears as shown.

Step 3: Strengthening the Gearbox

Picture of Strengthening the Gearbox

Now to strengthen the gearbox and the basics of the motor.


H1T4TCH1 (author)2011-09-05

Hey gingernutsjonny, check my gearbox! It has just been posted. It's made for functional purposes and works awesome.

kingmat (author)2010-10-02

hey i found that using the fast gear for around every one turn its around 15!!!!!!on the other (slow option)so thats like if you ue a 1000rpm drill you be getting 15000!!!!!!!!rpm on the other end imaging that on a roller coaster chain lift!

kingmat (author)2010-10-01

amazing love it thanks for the instructions!

bamcar1 (author)2010-09-02

make a part list please

mikstr2 (author)2009-07-20

I built this once and it makes the last part spin really fast. then I hooked up my 1350 rpm drill to it and all the pieces twisted up and I had to throw it away but it was worth it

Ps2playa (author)2009-07-02

i tried building this once and it did not work

Lowney (author)Ps2playa2009-07-03

I know why: you must have accidental confused the yellow rod with the grey rod. I've got a video of a nice big and open gearbox which shows the inner workings.

Lowney (author)2009-06-29

The problem with this is that (if it has 3 blue gears) it is pushing the limits of a K'nex engine (except the mains powered one) as more friction is generated and the torque required to get the whole gearbox moving increases dramatically. Because of this I think you'll find that with just 2 blue gears you get similar performance. It's also better for hand cranked stuff like ferris wheels or windmills. I made a gearbox too (check out my account, click my icon) but really big so you can see the inner workings!

the inventor (author)2009-03-17

zomg i cant believe this. ive not seen this thing for ages im spoonman192 i made this years ago before i made my youtube account omg cool for posting it i remember telliung a guy i would but i forgot so thanks!

i have removed my knex gearbox video now so u cant see it anymore this is spoonman192 btw

knexfreak95 (author)2008-12-02

if you wnat a good tranny go to

Mad Cat (author)knexfreak952009-02-11

Haha, that sounds hilarious.

knexfreak95 (author)Mad Cat2009-02-11

what does

Mad Cat (author)knexfreak952009-02-27

The 'if you want a good tranny' bit.

knexfreak95 (author)Mad Cat2009-02-27


amzk (author)2008-11-25

Viddeo please

gingernutsjonny (author)amzk2008-11-26

Sorry but I'm not doing a video for it.

pls (author)2008-11-23

make a huge one and see how fast it goes with a speedometer :D

gingernutsjonny (author)pls2008-11-23

some one did that they got 2400rpm.

pls (author)gingernutsjonny2008-11-25

tried to make my own, accidently made a 60 second timer :D

pls (author)gingernutsjonny2008-11-23

seen that before lol, thats insane!!

Oompa-Loompa (author)2008-11-22

it wouldn't be ps, pss, psss, it would be ps, pps, ppps, and so on.

thanks I've changed it now.=)

no problem.

knexguy (author)2008-11-22

So you have to rebuild the ratios every time you want to shift? Even so, good build. Try adding more complicated ratios.

gingernutsjonny (author)knexguy2008-11-22

what do you mean by more complicated ratios?

LinuxH4x0r (author)2008-11-22

Very nice! now just make it shift

ill work on it

Katarukito (author)LinuxH4x0r2008-11-22

yeah it's really simple to make a shift-able 2 speed gear box 3 if you count neutral

About This Instructable




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