A K'nex automaton with a programmable path. This alternating design was originally conceived by Heron of Alexandria.

I don't have enough string, so I could only run the short program shown in the video.

Step 1: Build Frame and Motor Components

where can i get that dual switch motor thingy? is it a knex set?
That's an All Terrain Trekker motor, I'm lucky, got 2 in newstate. It's discontinued (WHY???), so the only way to get it is to eBay it.
<p>Really? I have an all terrain trekker set and I thought it was nothing special. When did the discontinue it?</p>
ACtually, any sort of carnival set has motors, two way too!
Any motor will work from this model. That particular motor has been discontinued.
i can never figure out why they stopped making that motor. it was around the best one they made.
And the cyberknex too, WHY??? And WHY??? do they create STUPID BRICKS NOW!
I totally agree.
Yeah :D Thanks to everybody who voted.
no problem :-)
can you use a other motor like this or something???<br><br>
I don't get how you program it.
Wow! Tails lover haha.
Yeah, when I made this account, I was OBSESSED with Tails... Back on-topic with K'nex and string program... No I didn't make it yet, but I'll find some K'nex and some string and try to make it.
Your basically wrapping the stings so that it unravel at different intervals.. From there gears, gun and wheels may be moved, activated, cocked and what have you. -Not quite Anom delivers, Chris
Have you built it yet? All you do is loop the strings around the greys in different patterns and it will affect the movement. No loops means it goes straight.
I'm a little confused on the programming. It just doesn't seem explained well enough.
Okay, so do you change whether it's over or under by wrapping the string around the grey connector that was added, the change it from there? As in, L/5o/8u//<br /> After the 5o, you wrap the string around the connector at five, then go under 8, coming back to the connector at five?
The string needs to pass 5 rods over and then 8 rods under, so on the sixth rod you would be switching to under by wrapping around a grey connector. The numbers are irrelevant for most programs unless you need something especially precise.<br />
When I got some of the filler&nbsp;for my giant tub full of K'nex, (it's seriously full up.) I found a thing to make a robot in the instruction manual. I think I&nbsp;could build that onto this, to give it a little height.
No offence but I prefer Mikey13's one because it's smaller and more piece efficient but this is good 4.5* and a sub
The size of my automaton will not increase significantly with an increase in the length of the script.<br />
size of the robot/car
I have had a go at making my own programmable robot, with a repetitive program however I have not uploaded it -should i post? :
Go for it, looks really cool!
<a rel="nofollow" href="https://www.instructables.com/id/Programmable-Robot-V11/">https://www.instructables.com/id/Programmable-Robot-V11/</a><a rel="nofollow" href="https://www.instructables.com/id/KAP-V-Knex-Programmable-Automated-Vehicle-MK2/">https://www.instructables.com/id/KAP-V-Knex-Programmable-Automated-Vehicle-MK2/</a><br/>Both of my robots!<br/>
I bet you hate me for straying into weaponary... but I am going to add a gatling gun to the top of this :P
You could program the gatling gun to fire at specific intervals probably if you had a string pull a trigger every so often.
I loved this, never had the pieces.. i do now and i want to program it for a certian purpose. I've set several knex weapons up to cock back with one string, fire with the other.. I was having fun doing ti from a far distance but then i rememebred this.. Its dying for a shooting
That would be awesome.
The days of computers with punchcards are making a comeback with this instructable.
yay! you mentioned me ty lol
I think you don't need special K'NEX strings. Try using a normal household string?
this is just bog standard thread
1 month ago lol
Here is a sample script: L/8u/5o/8u/5o// etc R/5o/8u/5o/8u// etc Giives a sort of Snakey S shaped path Here's another one: L/32u// R/32o// Goes around in circles. lol fun to watch
Wow sweet thanks! If you want you can name your script and I'll add it.
cool but you cant exactly program it you can only make it go strait then turn and thats it. keep it up though! please tell me if I'm wrong.
Yes this is a program. Even a simple timer that turns something on and off is considered a program. This thing will do a lot more than that. Even though the video does not show it this thing can be programmed to go straight, turn left or right and even reverse. What more does it need to do.
nothing I didntknow for sure if it did more than go strait than make a turn.
Well, it does say programmable. And if it only went straight and made a turn, it wouldn't be programmable then :P
How can you program it? Just attach some rope? Or does it need to be attached in a special way?
Step 3.
yeah and that comment up there was from my bro because there is a problem with Ibles so it switches over some times
Yes, I mean that's about all any vehicle can do, right? Stop, turn, go straight, and this can do all of those things.
yeah but I mean it can only go strait then do a turn not go strait ,then turn then go strait ,then turn go backwards ,then turn around ,thats what I ment.
No, you can program it to do anything. You just have to change the program. I didn't have enough string to write a longer program, which is why my automaton only went straight and turned.

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