Introduction: Knex Ball Machine Lift: Double Stair Lift

Picture of Knex Ball Machine Lift: Double Stair Lift

Hey everyone,

here are instructions for a Knex Ball Machine Lift (The Dubble Stair Lift).

This lift can handle 3 knex balls at the same time and is really easy to make and works very smooth when instructions are carefully followed. Just make sure you have a 12V motor and enough Medium red (grey or yellow) gears, because you'll need about 24 of them. You can also check Step nr1 to see the special pieces you need to complete this build. If you don't have the pieces that you see in Step 1, don't worry, you can easily build this lift without them, it just makes the lift a bit more steady.

If you are interested in making a longer version of this lift, I recommend you to aply a second 12V motor on the top of the lift for a smoother rotation.

If there are any complains, questions or problems, please tell me in the comments below.

Thanks for watching, building,

Thibault Art.

Step 1: Special Pieces You Need:

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Step 2:

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Stop counting, there are 11 connectors and 21 spacers :p.

Step 5: Important Step:

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Make sure that all the black connectors are facing downwards.

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11 connectors and 21 spacers.

Step 12: Another Important Step:

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Now, make sure that all the black connectors are facing upwards.

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Step 19: Go Ahead and Try It Out!

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dvader1248 (author)2017-09-20

can someone tell me how many pieces this lift contains please so i know if i have all of the parts to be able to build it, and can someone list how many of each part too

bennett2198 made it! (author)2017-07-01

This is a fun lift to build. It runs smoothly and has not dropped any balls. It used up all my red gears so I now I have to buy some more.

The instructions were clear and putting it together went quite well. I did download a couple of high resolution images (the original 4k by 3k) so I could see more detail of where things went.


Thibault Art (author)bennett21982017-07-08

Awesome to hear that, thanks for building!

bennett2198 (author)bennett21982017-07-01

The video did not download for some reason so here is the Youtube video of it.

www139 (author)2017-01-24

Cool! This is one of my favorite lifts from your ball machine by far! Btw, I don't know if it was purposeful, but in the title the correct spelling is "double". :)

Thibault Art (author)www1392017-01-29

Oh, thanks for noticing. As you can clearly tell, English isn't my best language :p.

Do not feel bad about poor English. I have been speaking it for 56 years, and I still goof it up daily..

www139 (author)Thibault Art2017-01-29

Your English is really good! :D

Kipcorn (author)2017-01-25

Thanx for posting this nice instructions! I will build the ones from which i have the pieces. Pity the Green gear isnt in my collection. I am wondering in which Knex box you can find it. Have never seen it before.

Thibault Art (author)Kipcorn2017-01-29

Thanks for commenting and building! Yeah I know, the green gear is a very rare piece that has been discontineud a few years ago. I don't even know from which knex set it comes from : /. I was trying to make the same lift with a large yellow gear instead, But unfortunately, The lift doesn't work that well with a yellow gear.

fredrayn made it! (author)2017-01-19

first class, works well, but had to change the exit to suit me.

Thibault Art (author)fredrayn2017-01-21

Thanks for building 1 of my knex lifts! The exit you made looks very nice. Was the original exit not working properly?

fredrayn (author)Thibault Art2017-01-21

hi there,i made the exit to stop the ball falling off as i could not make your's work there was to much space at the end.( old type ball's).

Thibault Art (author)fredrayn2017-01-23

Ooh... ok. At least you found a solution for it. Nice job :).

About This Instructable




Bio: Hey everyone. I'm Thibault Art and my biggest hobby is to build huge machines in K'nex. I like also to draw a lot ... More »
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