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:
RC Tubing- 2 pieces, each 3 feet, 5 1/2 inches long
Black Y Clip-17
Small Tan (or Blue) Gear-4
Large Yellow Gear-1
RC Tubing Splicer-2
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:http://www.youtube.com/watch?v=p4Y1k7d9vPk