Introduction: K'nex Hammer Lift

About: Hi! I'm Ruben, better known as RNB. I'm a student Mechanical Engineering and hence like to build contraptions related to that. I mostly make use of K'nex, which is convenient to use since it is easy to design …


This is my new (and first) k'nex lift system. I came up with this idea, because the physics teacher was showing us the effect when anything that's heavy (a hammer) hits a light - weight thing. (a small ball) So I made that system with k'nex, and this is the result.

In this lift, a rotating arm goes up, and it comes down real fast, sending the ball up the incline.

The one in the video is a bit different, the one in this Instructable is better.

Hope you guys like it.

Click here to watch the video

Step 1: Parts List

These are all the parts you'll need to build the Hammer Lift.

Rods: 221






tan rigid-1

black rigid-1

Connectors: 154

dark gray-14

light gray-13





orange tube connector - 6




Other: 122

blue spacer-48

silver spacer-42

red gear-3     

blue/tan gear-1

small grey gear-1

tan clip-3

blue clip-15

Y clip-14

small wheel band-4

rubber band-1

chain link-7              

battery-powered motor-1

Total: 533

And,  of course, you'll need k'nex balls and tubing

Step 2: Base

You'll start with building the base. It's pretty easy.

Step 3: Right Tower

Again an easy step, next step is harder (finally...)

Step 4: Left Tower

Yeah, a harder step :). This side contains the system that block balls, and let every time one ball pass.

Step 5: Motor

This is a hard part to make, look closely at the quantity of spacers.

Step 6: Hammer

You're nearly finished! Just make the hammer: It's easy.

Step 7: Finished!!!

Congrats, you're done with your Hammer Lift. Here are some tips:

1. The new k'nex balls (the big ones) comes higher than the old ones: If you use them both, be careful at the top of your hill: the big balls could fly off the track.

2. Attach the track as much as possible, this is to save speed, and to reach higher. Also support the track  good: It mustn't be unstable, the balls slow than down quickly.

3. If the arm goes stuck on the system that let 1 ball / time go, make the second and the third picture.

4. If the balls are going to be launched off the entrance path, make it longer. If the balls don't pass, wait till other balls arrive. That balls will push it trough the system that block balls.

Please give a feedback and feel free to comment and rate!