Project (FS13)

January 16th, 2014 Leave a comment Go to comments

Targets II

For the Fall 2013 semester, your team is tasked with building a device that projects objects towards a series of targets. Each target will be worth a fixed amount of points (see the Points section). Your objective is to score as many points as possible in a 3 min. period. Rules are as follows:

  • Allowable sources of energy are: stored human energy (must be converted and stored within the device during the 3min. period though) and stored electrical energy (batteries)
  • All energy sources must be verified to be safe by your lab instructor BEFORE used by your team
  • During testing, all team members (and any proxies) must be at least 24″ away from the device
  • The device must initially fit within a 36” by 36” rectangular area on the welding table in the shop and be less than 72” tall
  • The device must not touch the table outside of the starting area at any time during testing
  • The edges of the table bordering the starting area may be used for clamping
  • Any safety issues are up to the instructor’s judgment
  • The maximum allowable voltage in your team’s device is 30V
  • If your team uses batteries, a maximum battery mass of 1kg will be allowed
  • The maximum projected object mass is 100g
  • 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.
  • It is your team’s responsibility to retrieve any projected objects within the 3min. testing time
  • The objects must be solid and have a volume (convex hull) of >0.065in^3 (roughly marble size)

Testing Area
Below is a rough sketch of the testing area. All dimensions are approximate. The testing area will be made available for measurement during the third week of class.


  • Target 1 – 1 point
  • Target 2 – 5 points
  • Target 3 – 10 points
  • Update: Bonus: 10x for each projectile scored in a target

Targets 1-3 will have a nominal inside diameter of 4″. Targets 1-3 will have a height of 6″ and will contain a material to limit bouncing out. All dimensions are approximate.   A “hit” is defined as the object being stationary and completely contained within the target (for targets 1-3). Update: A projectile hit in a target will be given a 10x points bonus. A projectile must be launched from within the starting area to the target.

*Point values may be adjusted to reflect Alpha prototype scores


  • The device does not need to be automated, external control may be provided remotely, examples of allowable control interfaces include:
    • Strings that can be pulled
    • Electronic switches (low voltage only, <14V)
    • A poke with a stick, etc.
  • Controlling the device may not impart additional energy to the system
  • The device can be “recharged” during testing for multiple attempts as long as it is completely within the start area during “recharging”


  • Performance: 60% (based on a linear weight between the minimum functionality criterion and the maximum score)
  • Update: Minimum functionality: 100 points
  • Creativity: 20% (based on a creativity metric)
  • Aesthetics: 20%
    • Team name on design (6%)
    • Team logo on design (6%)
    • Design is painted or decorated (8%)
  • If the device meets the minimum functionality criteria, the project automatically has a minimum of 70% score on performance
  • Points for minimum functionality will be established after alpha testing

Any changes to this project description deemed necessary by Dr. Hutcheson will be announced in class and noted as an update in the description

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