Introduction: Retrograde- Knex Ball Machine Instructions (Not My Design)

Picture of Retrograde- Knex Ball Machine Instructions (Not My Design)

This is not my own design, this is MarsCrystalMans ingenious design and I made an instructable for him on this. This instructable is quite long so it may take a while to build. This instructable is not intended to be high-quality but good enough to be understood. 

video at

Step 1: Piece Count


Grey: 58
Red: 175
Yellow: 173
Blue: 403
White: 363
Green: 340


White: 78
Blue 3D: 134
Purple 3D: 255
Yellow: 255
Gold-track connector: 17
Green: 209 
Orange: 125
Red: 184
Light-grey: 67
Dark-grey: 244


Black Y-clip: 63
Tan-clip: 28
Gold-track clip: 14
Ball-socket joint: 2
Silver spacer: 79
Blue spacer: 132
Purple flexi-rod: 16
Orange flexi-rod: 7
Golden(red) rod: 8
Red gear: 1
Blue gear: 5
Large yellow gear: 1
Tan(red) rod: 7
Small triangle panel: 11
Triangle panel(3 holes): 3
Small square panel(1 hole): 1
Square panel(3 holes): 3
Small tire with tread: 11
Medium tire with tread: 5
Large tire tread(no tire): 2
small snap-on tire: 2
Medium snap-on tire: 1
Motor(newer green ones): 1

Step 2: The Base

Picture of The Base

Step 3: Support Structures and Return Tracks

Picture of Support Structures and Return Tracks

A Big Step.

Step 4: Path Selectors and Drop-Path Selector

Picture of Path Selectors and Drop-Path Selector

Another big step. This also fulfills a request for the Drop-Path separator for a member.

Step 5: Stepper- Lift System

Picture of Stepper- Lift System

This fulfills another request for a member. This is an instructable in an instructable!

Step 6: Path 1

Picture of Path 1

I  found this element to be very cool.

Step 7: Path 2 ( Wormhole Element)

Picture of Path 2 ( Wormhole Element)

This path has the Wormhole Element someone wanted instructions on. Includes part of another path.

Step 8: Path 3

Picture of Path 3

The path that traps the ball behind the wormhole.

Step 9: Path 4

Picture of Path 4

This step may seem complicated but just copy what you see. I didn't feel like taking the whole thing apart. I used a tv jack cable for the tubing. I modified the element with spacers. The element didn't work for me for some reason, maybe because the cable was too thick so try roller coaster tubing.

Step 10: Path 5

Picture of Path 5

This includes the spinning wheel element, a very clever piece.

Step 11: Path 6

Picture of Path 6

This step includes the spinning basket element.

Step 12: Path 7

Picture of Path 7

Just about done! This is the graceful turn that really makes this machine unique.


albydesign (author)2013-05-26

looks awesome! I'm going to build it but do I need 17 gold track connectors?

No, I just built the ball machine as it was.

OZKNEX22 (author)2013-04-03

up to this step waiting for big yellow gear o come from ebay then ill continue building the ball machine has yellow gears, you just trying to find one for a cheaper price?

Good job, the instructions are very good. (And you just saved me a ton of time :-D). Also, I like some of your modifications; they enhance the machine, especially the spacers on the spiral, much better placeholders. One note: you said there is no video for the machine, but if you wanted, you could say "video at". That would cover it!
Once again, great job! The instructable has my seal of approval! (Not that you needed it, but... ;-D)

Thanks a lot :-D. I fixed the description so thanks for the tip.

sandroknexmaster (author)2013-04-01

Very clear, and instructions for the stepper lift.

OZKNEX22 (author)2013-03-31

yes you made instructions i going to start building tommorow ,good job :-]

About This Instructable




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