More K'nex Ball Machine Elements




Intro: More K'nex Ball Machine Elements

When building my latest and so far biggest K'nex ball machine, I've used a few elements which weren't on Instructables yet. I didn't describe all elements used in this machine, just the ones which weren't featured here yet.

It's also a nice chance to show some pictures of my 332 cm(130 Inch, 10,9 feet) tall machine itself! It's the biggest I've ever seen, and also the biggest on Instructables. As you can see I had to take out one of the ceiling plates to fit it in.
In K'nex terms, it's 21,5 red rod blocks tall.

Step 1: The Grabbing Dropping Arm

This arm grabs a ball at the end of a 45 degree down sloped path. It then releases it, and makes the ball fall into a basket below.

By sliding the counterweight up and down, you can tune the speed with which the arm moves.

Step 2: Simple Basket

This is a very simple basket, which fits really well into the red rod towers I always use. It uses 4 big triangular plates.

Step 3: Spiral Stairs

The stairs themselves are nothing new. I've always had problems making them long enough, so for this ball machine, I've cutted a piece of wooden rod. In this one, it's as long as two red rods(with a connector inbetween) I guess you can make them as long as you like.

Step 4: Rotator

Another one which fits into a red rod tower. This one uses an engine shaft to power two rods. These rotate the balls through, onto another path.



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    36 Discussions


    8 years ago on Step 4

    Out of curiosity, were any of these ideas inspired by the Power Tower crane kit that Knex used to make? It looks like some of the elements in that set.

    3 replies

    Reply 7 years ago on Step 4

    somthing like this was used in the Power Tower Crane, but this is only single layered where as the Power Tower Crane had 2 layers to it.


    Reply 7 years ago on Step 4

    On later ball machines I've vuilt them with 4 layers, that's much better!


    Reply 8 years ago on Introduction

    Yup, have that one also! It's nice, but I've added elements from the big ball factory(copied from images)


    Reply 7 years ago on Step 3

    It's not as much about the spiral stairs itself, it's about the long wooden rod, which makes it possible to make these stairs much longer.


    8 years ago on Step 3

    look at Darth Trainman's ultimate guide to ball machine elements to see how to connect rods together to make a spiral

    2 replies

    Reply 8 years ago on Step 3

    I've seen how it works, though my solution provides a smoother stair. I've got a wooden rod of three red lenghts now, makes quite a nice stair!!


    Reply 8 years ago on Step 3

    How did you shape the wooden rod the right way? Like, how did you shape the ends so you could put connectors on them?

    Also, does anybody know how to get "sponsored by K'nex"?


    10 years ago on Step 3

    You can possible also make them on another way. Take a few gray rods, build the stairs, then put the rods into the stairs. But don't add conectors between the gray rods. Just let them slide in and put two connectors to the end. This is just a concept, i'm not sure if they will stay together. Hope it works!

    4 replies