SP 15 Project

August 10th, 2015 Leave a comment Go to comments

The compact disk, having been supplanted by other storage media, is nearly obsolete. Dr. Hutcheson, having purchased many albums and games on CD, has a problem: he has too many CDs and desires to throw them away as expediently as possible. To this end, your team has been tasked with developing a device that accomplishes this task. The task is further defined as follows:

  1. Dr. Hutcheson prefers not to have to walk to the trash can to throw his CDs away.  Therefore your team’s device must project them from a loading area towards the trash can (simply moving the trash can closer is not a valid solution to this dilemma).
  2. The trash can, a standard 55-gallon metal drum, will be located approximately 20 feet away from the loading area.
  3. The loading area consists of a 24″x24″ area on the welding table in the IDE20 shop.
  4. Your team’s device must start in, and be completely contained within, this volume. It can leave in whole or in part after being triggered.
  5. To prevent your team from building obnoxiously tall devices that are difficult to transport and then taking this out on Dr. Hutcheson in teacher evaluations (even after he warned you to not build obnoxiously tall devices), the maximum height of the device is 36″.  This gives your team a volume of 24″x24″x36″ to work with.
  6. Dr. Hutcheson is impatient, your team has 3 minutes (total) to test counting setup and take-down.
  7. CDs used during testing must be provided by your team, they must be standard 4.7″ diameter unmodified CDs.  Any object attached to the CD during testing must be quickly and neatly removed (i.e. no tape).

To judge the effectiveness of your team’s device, the following criteria will be used:

  1. Accuracy: You will be given five attempts at projecting CDs, each CD that enters (and stays within) the trash can will count for 10 points for a maximum of 50 points.  Multiple attempts may be made at the same time (i.e. you can project more than one at a time).
  2. Creativity: Dr. Hutcheson gets tired of seeing the same solution to a design problem over and over again, therefore creativity will be rewarded.  Creativity will be assessed out of 20 points using a functional modeling based creativity metric.
  3. Aesthetics: Your team’s device must be attractive and show good workmanship, to this end aesthetics will be judged out of 20 points.  Aspects that will be counted in this scoring include: decoration, team name/logo present, fit/finish and overall build quality.  Note: for this semester, painting is not allowed (since someone painted an assistant vice chancellor’s car last semester and Dr. Hutcheson does not wish to get any more angry phone calls from university administrators).
  4. Weight: Dr. Hutcheson requests that your team make the device as light as possible.  Weight will be judged out of 10 points.  The lightest device that is cabable of scoring 1 CD will be awarded a score of 10 points.  The heaviest device will get a weight score of 0 points.

Safety, being of the highest priority, necessitates the following rules:

  1. The device must be powered by stored human energy (stored within the 3 min testing time) or electrical energy stored in the form of a battery
  2. The maximum allowable voltage is 30V
  3. The maximum allowable battery mass is 2kg
  4. The CDs must remain intact, any device that causes a CD to fracture will not be allowed to test (or continue to test)
  5. A remote triggering mechanism must be employed that allows the device to be operated from outside of the loading area (i.e. operators must be outside of the loading area when the CD is projected).
  6. The machine must be verified to be safe by your lab instructor BEFORE used by your team.
  7. Any safety issues are up to your instructor’s judgment.

The device must be designed and built by your team. Components may be sourced from vendors but must be team assembled. What is and is not considered to be team-built is to be determined by your lab instructor and/or Dr. Hutcheson.  The device may not be wholly (or almost exclusively) constructed from a component toolkit (like Lego bricks).

Note: This is not Dr. Hutcheson’s first project.  If rule changes need to be made for reasons of safety, or to ensure that the project offers a fair/reasonable challenge he will make such changes.   Changes to this description will be noted as an Update: an discussed in lecture.


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