Knex Trammel of Archimedes

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Introduction: Knex Trammel of Archimedes

About: U.B. Electrical Engineering. I enjoy building with Knex and I have been using this site for a few years now. So, subscribe if you like what I do.

Hey guys!

I'm on winter break from college and got bored so I decided to pick back up an old hobby- knex. I built what I think is the first ever knex trammel of Archimedes. It's a truly fascinating machine with practical uses as it converts circular motion into oscillating linear motion. Unfortunately my break is almost over so I can't implement it into anything other than a mesmerizing kinetic sculpture. I made this in a few hours to prove the concept out of knex. It is a lot larger than I originally planned; however, it could be reduced in size rather easily. This mechanism has been made out of Lego by JK Brickworks, which is where I got my inspiration. My hope is that someone will take my proof of concept and make something innovative out of it. If you just want to see it in action, I've embedded a video; however I also made step by step instructions, so without further ado... happy building.

Note: This uses four cut white rods (step six shows modification to avoid the use of cut pieces) and the instructions also show the use of orange brace clips which are entirely optional.

-knextremist

Video URL (in case embedded video is not working for you): Knex Trammel of Archimedes

Step 1: Motor Housing

All additional instructions will be in image notes.

Step 2: The Base

Image notes.

Step 3: The Cap

This piece caps off the base and motor assembly. Image notes.

Step 4: Lower Track

The sled rides over top of this. Image notes.

Step 5: The Sled

This is the magic behind the trammel. The step after this shows instructions for using no cut pieces. Image notes.

Step 6: The Sled (No Cut Pieces)

This is the version with no cut rods, it is slightly less stable; however, it can be reinforced with a small layer of tape. Sorry these photos are so dark. Image notes.

Step 7: Upper Track

This keeps the sled in place. Image notes.

Step 8: Bracing

These are optional because...

Pro: they lock the upper track down

Con: they occasionally cause jams in the sled if the sled gets caught on them

Because the machine works both with and without these braces, it is up to you as to whether or not you want to put them on. Image notes.

Step 9: You're Done

Thanks for viewing. The hope here is that people can take the concept and do something innovative with it.

-knextremist

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    13 Discussions

    0
    Thebluepan
    Thebluepan

    6 weeks ago

    I also have an idea for this but weather it will work or not will take a year or 2 for me to find out. I got to design it, build it and do some trial and error testing.

    if it works I will tell everyone about the idea if not on to the next big build

    0
    That_Jamie_S_Guy
    That_Jamie_S_Guy

    3 years ago

    I made a small one that almost worked but this ones awesome!

    0
    The Knex Inventor
    The Knex Inventor

    3 years ago

    Wow, this is amazing! I bet there would be lots of uses for this mechanism.

    0
    knextremist
    knextremist

    Reply 3 years ago

    Thanks! Yeah this mechanism holds massive potential

    0
    The Knex Inventor
    The Knex Inventor

    Reply 3 years ago

    You're welcome! Yes, I can definitely see this being used in many other projects.

    0
    random_builder
    random_builder

    3 years ago

    This is crazy! It doesn't seen like it would be possible to make something like this out of knex. Great job!

    0
    knextremist
    knextremist

    Reply 3 years ago

    Now we just need someone to do something with it

    0
    random_builder
    random_builder

    Reply 3 years ago

    What could you make with it? Maybe you could make a ball machine element or lift with it, but I think it is good enough the way it is.

    0
    GWorks
    GWorks

    3 years ago

    Very nice! Works smooth as silk. Impressive :)

    0
    knextremist
    knextremist

    Reply 3 years ago

    Thanks! Means a lot!

    0
    www139
    www139

    3 years ago

    This is absolutely amazing! I can see potential from this practically spilling out! Thank you so much for this inspiration!!

    0
    knextremist
    knextremist

    Reply 3 years ago

    Thanks for the kind words