Since lots of people like this lift, I decided I would make an Instructable of it. This is the first Knex spiral lift that has two spirals instead of one. This allows twice as many balls to be lifted up into the tower than the original spiral lift. It's also the first to use tubing for the spiral, which makes it perfectly round.

This lift is a copy of the one I used in Wipe Out, except it's shorter, it uses a battery-powered motor instead of an electric one, and the tracks going in and out of the tower are different. It can be built with only one spiral, but the bottom where the balls come in might have to be changed. A cool thing about this lift is that the platform and shaft can be on any side of the tower because the double helix is in the center. It's also easy to modify.
This is my first Instructable, and it took me a long time to make because the pictures took a very long time to upload.

Here's all the pieces you'll need to build the double helix lift:

Tan (rigid)-1
Total rods:307

Dark Gray-54
Light Gray-0
Blue 3D-41
Purple 3D-71
Total connectors:262

RC Tubing- 2 pieces, each 3 feet, 5 1/2 inches long
Battery-Powered Motor-1
Black Y Clip-17
Tan Clip-10
Blue Spacer-40
Silver Spacer-28
Small Tan (or Blue) Gear-4
Red Gear-1
Large Yellow Gear-1
RC Tubing Splicer-2
Total other:106

Grand Total: 675 pieces

If you have all these pieces, let's get building!
I hope you like it!

Here's a video of the lift in action:

Click here to view the original double helix lift, used in Wipe Out:

Step 1: The Double Helix, Part 1

To start out, let's build the core of the double helix. The red rods that help make it sturdy are in a repeating pattern all the way up. The tubing will go on it in the next step.
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tytiger335 years ago
Where can you get the big yellow gears these days?
Shadowman39 (author)  tytiger335 years ago
Try eBay.
Thanks knex dosnt sell them any more soo..... yaehhhhhh...........
try knex user group ,they sell everything

That's where i get my parts too

They don't sell them anymore.
Knex .com
this lift is by far the best of any helix lifts that I have built... Great design, and look for it in one of my future machines....
Shadowman39 (author)  MisterBukweet1 year ago
Thank you! I'm glad to hear that it works well. Looking forward to your next machine. :-)

In my build, I replaced the dark gray connectors holding the purple RR rail with orange rail connectors.. the balls roll up the lift much smother..

cooljupjup2 years ago
i`am going to build this soon :D
cooljupjup2 years ago
works this lift with the newer balls?
Shadowman39 (author)  cooljupjup2 years ago
I think so.
KGuy3 years ago
Can you use the other type of motor, not the pack?
Shadowman39 (author)  KGuy3 years ago
Yes, but the speed will be different.
Cool, it works realy good!
Shadowman39 (author)  sandroknexmaster3 years ago
Thanks, glad it works well. :-)
Gnmar27233 years ago
Shadowman could you make this really tall like 8 red boxes or so? Also please check me out on youtube @ Youtube.com/user/Gnmar2723.
Shadowman39 (author)  Gnmar27233 years ago
It probably wouldn't work if you made it that tall, since the helix wouldn't be strong enough. And I've seen your Youtube channel before, you have some good ball machines. :-)
Ok i decided to build the inverted helix instead because its stronger. Thanks a lot i was totally inspired from cataclysm and wipe out! :D
Shadowman39 (author)  Gnmar27233 years ago
Cool! I'm glad you like them :-)
jameshond3 years ago
can i use big air ball tower balls
Shadowman39 (author)  jameshond3 years ago
I never tested those types of balls, but they will probably work.
it works i test it and i build this lif it is an cool lift
Shadowman39 (author)  jameshond3 years ago
Cool, thanks!
MegaMetal84 years ago
Would build this if i had the Large Yellow Gear :-(
You don't have a large yellow gear. Ihave six of them.
Thankyou for that. (Sarcasm)
Shadowman39 (author)  MegaMetal84 years ago
You could try to hook up the motor to the axle of the double helix, without using any gears. But the helix will spin around much faster.
you can still gear it down with red gears..
just smalll gear leding to a red gear is enouth...
Ya might use it
MegaMetal84 years ago
If I made this single would I put tubing connectors (Dark grays ) only on the 2 opposite sides
Shadowman39 (author)  MegaMetal84 years ago
The dark gray connectors will spiral around on one side.
If this is the tube will it go


knexpeople5 years ago
Balls constantly fall out,i think im am going to build te tower again.
maybe you used wrong balls,:-p
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