Floor Double Arm Lift, a Knex Ball Machine Lift




About: Hey! I'm Sandroknexmaster. I like building with knex, especially ball machines. I live in Belgium. I speak Dutch, but also English and French. I hope you like my stuff, and like always comment, rate &...

Hello everyone!

The Floor Double Arm Lift is the first of 2 lifts first seen in my ball machine Revolution.

This one is a double arm lift. Nothing special you'd say. But...

It's a bit different than a standard arm lift because the balls enter directly from the floor, not from an entrance track (as the title says).

When it's not in a ball machine, I think the Floor Double Arm Lift looks quite ugly. But it looks better when you build a ball machine around it.

If you're going to build this lift, please read the image notes, they might come in handy!

You can always send me a question if necessary with a comment or PM.

I hope you like it and thanks for watching / building!


Step 1: Piece Count

If you want you can count the pieces before you start building.

Here is a list with all pieces included in this lift, named by their original color:


Green: 230

White: 126

Blue: 132

Yellow: 67

Red: 76

Gray: 29

Total rods: 660


Dark-grey: 19

Light-grey: 17

Orange: 44

Red: 15

Green: 12

Yellow: 59

White: 116

Purple: 98

Blue: 40

Total connectors: 420


Blue spacer: 22

Silver spacer: 41

Tan clip: 5

Y-clip: 9

Small blue gear: 1

Large yellow gear: 1

Motor: 1

Total other: 80

Grand Total: 1160

Step 2: Floor

The first step contains the floor and the base underneath it.

Step 3: Frame (Part 1)

The first part of the frame. There are 2 parts in total.

Step 4: Frame (Part 2)

Second part of the frame.

Step 5: Motor

The motor section.

Step 6: Arms

In this step we're going to make the arms.

Step 7: Exit

The last step!

Step 8: Finished!

Your Floor Double Arm Lift is finished! Congrats!

Always slide the switch of the motor to the left.

If you have built this lift, you can always send me a picture so I can add it to this step.

Thanks for watching / building!




    • Leather Challenge

      Leather Challenge
    • Fat Challenge

      Fat Challenge
    • Pie Contest

      Pie Contest

    29 Discussions


    10 months ago

    Is there any way to extend the white floor on all four sides without moving the structure holding the arm?

    2 replies

    Reply 6 months ago

    Yes, then the structure would just come out of the floor and the balls could roll around it. Another thing you can do is make the structure wider, and the axle longer. I wouldn't make it too wide though because then the axle won't be strong enough anymore.

    No not really, the smallest ball machine you can find on my profile is revolution. Maybe I'll make a smaller ball machine in the future.


    4 years ago on Introduction

    Cool lift! Would it also work when I'd only use the arms and motor and build it in a different environment (I was planning to let the arms pick the balls up at the end of a tube-track).

    3 replies

    4 years ago

    Congrats on getting featured! :D