Parallax-A Knex Ball Machine

About: I love building. A mechanical engineering student, most of my instructables involve modeling projects, K'nex ball machines, and Lego creations. I am also a model railroader, and I enjoy science (astronomy is...

This is my second ball machine on instructables...Parallax! Definition for the curious:(Parallax-a term referring to a technique in astronomy used to find the distance to a star). Anyway, this machine has four paths, and some elements a bit more complicated than those in Subduction (my other Knex ball machine). Parallax uses various elements by users from around the site; I'll give credit on the path steps. Also, look for my Green Flex Path-my own invention. Enjoy!
     Video at   or below (another improvement over! Sorry if it's not the best quality...I've never made a movie before; it's better than nothing. Once again, for the curious, the music in the video is Frederic Chopin's "Etude in C minor, op. 10 no. 12 'Revolutionary'")

Step 1: The Lift

I used Tornado96's Alternating Arm Lift (1 extra module) and yardking's infinity switch for my lift and path separator. Also it has a curved yellow slide path that I came up with for tighter curves. The pictures should explain themselves...

Step 2: Path 1

Path 2 includes a classic spiral, KneXtreme's simple stair, Kariah's red ball dropper, a slightly modified martb95 halfpipe, and a basket.

Step 3: Path 2

Path 2 consists of sandrokexmaster's vertical clickers and another bit of curved yellow slide.

Step 4: Path 3

Path 3 starts with a winding descent to 8chillpill's Ball Flipper. The Flipper drops the ball onto my new pathing type (Green Flex Path, a very sturdy and versatile path) which takes the ball back towards the lift.

Step 5: Path 4

Path 4 starts with another classic spiral (a mirror-image of the one on Path 1) and then drops onto a back-and-forth descent before entering the opposite end of the halfpipe.

Step 6: That's It!

Thanks for looking at Parallax!



    • Fat Challenge

      Fat Challenge
    • Tape Contest

      Tape Contest
    • Pocket Sized Contest

      Pocket Sized Contest

    18 Discussions

    WHOA!!! I had no idea there were enough pictures to make the whole thing. (I would have posted a lot more if I were aiming for that, haha.) Great job, methinks you are a ball machine builder. Glad you were able to make it.

    No, I used regular old golf balls (some of them actually used for that purpose in the past). However, I had to tweak my machine quite a bit to get it to work right, and (then again) most ball machines are a bit temperamental.


    6 years ago on Introduction

    Meh, vid isn't available in germany :/
    And do you knwot aht you can embed vids? ;)

    Oh, and the ball machine is looking ccoooooooooooooooooooool! :D

    4 replies

    Well, there is a embed video button in the what you see is what you get editor and there you enter the embed code.
    You get it by going to the yt vid, hitting share, and then there should be a button embed and when you hit it it should give you the code :)

    Thanks for the praise and for giving the idea for the whole of Path 2!
    About the stopmotion, there's a good reason nobody does them: videos are much more effective for catching the ball's movement, and it's hard to make a stop-motion animation of a falling ball. :D I found that my camera actually could take videos, but it took me a week to get the thing formatted for uploading to the internet. :C But finally the finished product is here! (By the way, you're fast at responding; I published it and there was your comment!)