12.29.12-Robots Take what is Given to Them

Attendance


  • Evan

Journal


Tasks

  • Create LED circuits for weighted ring detection
  • Swap out threaded rod drive shafts for a more aggressive one
  • Mount the fork lift mechanism
  • Mount the vertical bucket adjustment mechanism

Reflections

The new drive shafts are installed. With a 4-1 thread ratio it should take about 40 turns of the shaft to move the slide the entire length of the shaft. The threads are very precise and highly polished and the nut is made from a high-strength, low-friction polymer that moves very smoothly and precisely. We mounted both ends of the drive shafts into precision ball bearings, Purchased from McMaster-Carr, authorized by the First Tech Challenge. The entire mechanism is very smooth, has almost no slop or vibration, and should allow for very precise positioning. It should definitely up our game mechanically. Evan is reassembled the scissor, and then Evan had to finish hooking up the LEDs. This mechanism was cleverly put into place by utilizing the principle of two conductors with weight pressing them together completes the very simple circuit of turning on a light bulb, in this case being an LED.  Everything should be ready to test by tomorrow morning. It took a bit longer than Evan had anticipated but it took a bit more engineering than also had been anticipated to design replacement shaft mounts, and Evan had to make totally new slides since the mounting hole spacing of the new nuts was completely different than the old ones.  Evan attached 16 screws to the rear of the robot and then realized that it was very unstable and thus added two cross-members for increased strength and stability. Evan also thought the design for the mechanism.  Evan also very carefully attached a servo style mechanism which allows for increased accessibility and ease of use.

 

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