K'nex Gearbox: Make Your K'nex Motor 6x Faster!

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About: I like being creative.
Check out my Knex Army Knife too!

Hi guys, here are the instructions for my K´nex gearbox.


You can increase speed by approx. 6x compared to the original K'nex motor speed. It packs a punch, the box construction is very strong. I dropped it some times and only 1 thing came off. The gearbox is easily upgradeable to reach higher speeds, but my K'nex motor can't provide more power than what it's now. The gearbox is nicely hidden in a fairly small and strong box.

Pros:

- Colorful!
- Strong
- Compact
- Easily upgradeable
- Looks pretty nice
- 6 times faster rpm compared to the original K'nex motor rpm

Cons:

- Takes some time if you want to change something inside
- You need a pretty strong K'nex motor


Tell me what you think, and don't forget to rate!

Well, let's build this thing!

Video:

Step 1: Piece Count.

This is the excact piece count.

Connectors:

Yellow -------- 7
White --------- 18
Purple 3d ---- 32
Blue 3d ------- 4
Red ------------ 10
Tan clips ------ 8
Blue clips ----- 5


Rods:

Green --------- 86
White ---------- 70
Strong red ---- 3


Misc:

Blue spacers - 20
Big gears ------ 3
Small gears --- 2
Motor ----------- 1

Step 2: Build the Base.

Read all image notes.

Step 3: Make the Walls and Add Them to the Base.

Read all image notes.

Step 4: Make the Axles.

Read all image notes.

Step 5: Make and Add Another Wall.

Read all image notes.

Step 6: Get Your Motor.

Read all image notes.

Step 7: Add the Axles.

Read all image notes.

Step 8: Finish Off.

Read all image notes.

Step 9: You're Done!

Now make 2!

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    54 Discussions

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    pephooh

    1 year ago

    is it possible to slower the motor instead of faster?

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    dynamite_kid

    1 year ago

    Nice I made it faster and changed it for my knex marble machine and it works a treat really cool

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    rickmcc

    4 years ago on Introduction

    The 3rd (and final) axle does not need the larger yellow gear on it does it? Seems the speed multiplier gears (large yellow drives smaller blue) finishes on the 3rd axle's small blue gear. The yellow gear should not do anything useful should it?

    1 reply
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    H1T4TCH1rickmcc

    Reply 4 years ago on Introduction

    You are right. I only put it there to be able to extend the box even more if I wanted to. The multiplier indeed finishes on the small blue of the 3rd axle.

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    knexboy586

    5 years ago on Introduction

    i made it and turned on the motor but it went the same speed please help. p.s it had freash batteries

    1 reply
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    TLF93

    5 years ago on Introduction

    nice job it's really cool and do you think if i try to put two more gears on it, will it go even faster

    1 reply
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    H1T4TCH1TLF93

    Reply 5 years ago on Introduction

    Yes you could do that, but I think it will slip faster when you connect the final gear onto something.