# Engineering Projects/Rube Goldberg/Howard Community College/Spring2012/p1501-ZEL
### Problem Statement

To create a Rube Goldberg machine as shown in the OK Go video "This too shall pass."

### Team Members

    Zechariah Bennett
    Erika Spangler
    Lemuel Sun

### Summary

The team spent the last four weeks constructing a Rube Goldberg Machine. Ideally we would mount patches of gears from broken printers onto a board and power them with motors attached to arduinos or external power boxes. In the middle of the process, the main motor that was to be used short-circuited, and became unusable. To overcome this obstacle, the team had to figure out the wiring for another motor, which had six wires attached to its board. A third team member worked on designing different water jet prototypes. Ideally we would integrate the two.

### Story

Tell a detailed story of the project. Describe how split up, what the obstacles were, what testing was done, what informal decisions were made, what assumptions were made, what the results were.
At the start of the project, the team was planning on creating a traditional Rube Goldberg machine. However, when "advised" the team decided to use printer boards, which contain many sets of gears and solenoids. The team decided that it would be best to attach the various printer boards to a sheet of plywood. When attempting to connect multiple printer boards together, the team encountered a few problems. The easiest problem to overcome was that the metal protection shields that are attached to the printer boards got in the way of two different printer boards from meshing the gears together. The team had to cut part of the metal shield off, and then sanded down the edges of the metal, so that it would not cut future students or viewers who decided they wanted to touch it. The biggest single obstacle to the whole project was when the primary motor short-circuited, rendering it useless. In order to keep moving forward, the team had to use another, older motor. This motor had six wires attached to it, so the team had to determine which wires did what. After finding this, the team was back on track.

### Decision List

List all formal decisions made with links to their documentation such as a decision tree or decision matrix.
Decision Matrix for Selecting a Water Jet Design
| | Simplest to Build | Conserves Water | Water Control | Total |
| Piano WJ | 3 | 2 | 5 | 10 |
| Pendulum 1 WJ | 5 | 3 | 4 | 12 |
| Pendulum 2 WJ | 6 | 4 | 3 | 13 |
| Spinning WJ | 2 | 5 | 2 | 9 |
| Solenoid WJ | 4 | 1 | 6 | 11 |
| Tube WJ | 1 | 6 | 1 | 8 |
Erika
| Primary Focus | Simplest to Build | Cost | Expandability | Total |
| Multiplier | 1 | 1 | 1.5 | |
| Mechanical | 3 | 1 | 2 | 7 |
| Gravitational | 2 | 3 | 4 | 11 |
| Domino Effect | 4 | 3 | 5 | 14.5 |
| Mixture of All | 2 | 2 | 2 | 7 |
Sam
| Primary Focus | Simplest to Build | Cost | Expandability | Total |
| Multiplier | 1 | 1 | 1.5 | |
| Mechanical | 2 | 1 | 3 | 7.5 |
| Gravitational | 4 | 3 | 1 | 8.5 |
| Domino Effect | 2 | 2 | 1 | 5.5 |
| Mixture of All | 2 | 1 | 1 | 4.5 |
Zechariah

### Material List

Currently used:
| Material | Quantity | Size | Cost |
| Printer Gearboxes | 4 | Various | None (found in backroom) |
| Arduino | 2 | Small | None (found in room) |
| Motor | 3 | Medium/Small | None (found in room) |
| Screws/Nails | Several | Medium/Small | None (found in back room) |
Future acquisitions:
| Material | Quantity | Size | Cost |
| Tubes (metal/pvc/cardboard) | Unknown | Various | None (found in backroom) |
| Solenoid | Unknown | Small | None (found in room) |
| Power Supply 24v | Several | Medium/Large | Unknown (preferably salvaged or scavenged) |
| Ball | Several | small/medium | None (found in room) |
| Screws/Nails | Several | Medium/Small | None (found in room |
Future acquisitions will vary based on what kind of devices we decide to mount and incorporate

### Software List

Arduino Software installed on Laptop: allowed for the control of devices like the motor through various programs implanted on the arduino

### Time

32.6 hours

### Tutorials

Arduino tutorials
Guide to laser printer motor

### Next Steps

The motors are now ready to go and so from now on, we would continue to mount the gears to the board and figure out how to incorporate the motor onto the board. Furthermore, we could begin to mount additional new devices and mechanisms onto the board. Also need to make the board possibly more aesthetically pleasing.