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https://www.thingiverse.com/thing:1769714
Archimedes Screw Bonanza by MakerBotLearning is licensed under the Creative Commons - Attribution license.
http://creativecommons.org/licenses/by/3.0/

# Summary

The Archimedes screw is a device believed to be invented by Archimedes, one of the world's greatest scientists, in the 3rd century B.C. It was most often used to transport water from lower ground to higher ground for purposes of irrigation, flood prevention, and more. Interestingly, it is still used today in many different applications.

In this lesson, students are tasked with moving different materials up an incline using an Archimedes screw. This project is intended for high school engineering or physics students, though can be scaled back to use in lower grades as well. 

Here's a video of the sample file included, showing how a basic Archimedes Screw works: https://youtu.be/dqR61dKTcHE?list=PLvy119PeSK5gUZak-0c0tqIgpWvGlED39.


# Print Settings

Printer Brand: MakerBot
Printer: MakerBot Replicator (5th Generation)
Rafts: Yes
Supports: No

Notes: 
- Each Blade part is only ~5 in tall. Print more than 1 if you want to make a long screw and connect them with the BladeConnector and some glue (the sample shown is 3 sections)
- You don't really need to print out CaseTop unless you plan to enclose the screw
- You could likely use something non-printed (PVC tube or similar) in place of the CaseBottom to save some printing time
- Bottom Adaptor needs to be printed with support material. All other parts should print well without supports.

# How I Designed This

The sample file included was designed in OnShape. If you would like students to start with this design, I made the file public here: https://cad.onshape.com/documents/45a752c603d10bb34fbe1e34/w/dde73d88c67e0cad91526961/e/9796c97fe0b7b2fd3907f5c9. 

If students are starting from scratch, you can use any design program you want (as long as it’s capable of making helixes).

If you don’t want to involve 3D design in this project, here is a great Customizer design that allows you to create a custom screw without needing to actually design it: http://www.thingiverse.com/thing:96462.

# Sample Design Details

Below is a breakdown of the sample file included in the Thing Files. The sample file included was designed in OnShape. If you would like students to start with this design, I made the file public here: https://cad.onshape.com/documents/45a752c603d10bb34fbe1e34/w/dde73d88c67e0cad91526961/e/9796c97fe0b7b2fd3907f5c9. 

![Alt text](https://cdn.thingiverse.com/assets/bf/79/5a/35/a1/onshape1_labeled.jpg)
Part diagram (not pictured: case front and spill plate)

![Alt text](https://cdn.thingiverse.com/assets/54/c1/95/f4/8f/onshape2.jpg)
Blade Connector (green part) allows you to connect multiple blades together to make long screw designs. It's also used to attach the crank to the top blade.

![Alt text](https://cdn.thingiverse.com/assets/7a/58/e5/97/48/onshape3.jpg)
Blade Profile sketch. 65 degree angle allows for printing without support material.

![Alt text](https://cdn.thingiverse.com/assets/95/e6/7a/f2/c1/onshape7.jpg)
Helix sketch defines the pitch of the blade. I used the Sweep Tool to create the blade. 

![Alt text](https://cdn.thingiverse.com/assets/a7/c1/1c/dd/88/onshape8.jpg)
Blade 1 created using the Sweep Tool with the Blade Profile Sketch and the Helix sketch.

![Alt text](https://cdn.thingiverse.com/assets/c9/58/85/17/ea/onshape10.jpg)
Copied and rotated Blade 1 by 180 degrees to create Blade 2.

![Alt text](https://cdn.thingiverse.com/assets/e9/75/ac/3f/f7/onshape5.jpg)
Editing the Helix sketch is a quick way to dramatically affect your screw. In this case, I reduced the pitch to create a tighter screw.

![Alt text](https://cdn.thingiverse.com/assets/de/5e/74/04/36/onshape9.jpg)
Updated screw after reducing the pitch.

![Alt text](https://cdn.thingiverse.com/assets/a3/85/4c/02/9a/onshape11.jpg)
Experiment with the space between the blade and the Case to minimize water loss. 

![Alt text](https://cdn.thingiverse.com/assets/be/56/c9/1f/ca/onshape12.jpg)

<iframe src="//www.youtube.com/embed/dqR61dKTcHE?list=PLvy119PeSK5gUZak-0c0tqIgpWvGlED39" frameborder="0" allowfullscreen></iframe>
Video of the Sample Screw in action