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.
H1T4TCH13 years ago
Hey gingernutsjonny, check my gearbox! It has just been posted. It's made for functional purposes and works awesome.
kingmat4 years ago
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!
kingmat4 years ago
amazing love it thanks for the instructions!
bamcar15 years ago
make a part list please
mikstr26 years ago
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
Ps2playa6 years ago
i tried building this once and it did not work
Lowney Ps2playa6 years ago
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. http://www.instructables.com/id/Ultimate-Knex-Gear-box/
Lowney6 years ago
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!
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
knexfreak956 years ago
if you wnat a good tranny go to http://www.youtube.com/watch?v=TWiB1bOxCHQ
Haha, that sounds hilarious.
what does
The 'if you want a good tranny' bit.
amzk6 years ago
Viddeo please
gingernutsjonny (author)  amzk6 years ago
Sorry but I'm not doing a video for it.
pls6 years ago
make a huge one and see how fast it goes with a speedometer :D
gingernutsjonny (author)  pls6 years ago
some one did that they got 2400rpm.
tried to make my own, accidently made a 60 second timer :D
seen that before lol, thats insane!!
it wouldn't be ps, pss, psss, it would be ps, pps, ppps, and so on.
gingernutsjonny (author)  Oompa-Loompa6 years ago
thanks I've changed it now.=)
no problem.
knexguy6 years ago
So you have to rebuild the ratios every time you want to shift? Even so, good build. Try adding more complicated ratios.
gingernutsjonny (author)  knexguy6 years ago
what do you mean by more complicated ratios?
LinuxH4x0r6 years ago
Very nice! now just make it shift
gingernutsjonny (author)  LinuxH4x0r6 years ago
ill work on it
yeah it's really simple to make a shift-able 2 speed gear box 3 if you count neutral