Critical Design Review

HHS / NASAHQ Robotics, Team 116

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Drive System

  • 3 ½ inches per side
  • 3 ft per second, direct drive, low gear – 300 RPM
  • inside – al
  • outside – polycarb
  • (2) 3 inch wheels, 1 2 inch
  • spacers
  • 7" middle, 8 ¼" to the top
  • goes over the wood block
  • 25 - 30 lbs, most likely on the high side
  • SPI: $100
  • Has given Hashmatt the bill of materials

Frame

  • 35" long, 10" high (most likely will be shorter)
  • control system on lower deck
  • 20 x 22 – lower level for the control system, vertical height =
  • interface with piston, clearance
  • frame= Al X stuff – 1" x 1", 33 feet
  • tri-sided cubes for corners, outside
  • corner, inside
  • no SPI cost
  • 17-18 lbs
  • NEED: hard mounting point off the ground for the wheels, arm piston
  • The arm piston has to be 1" off the ground
  • Jack and Mr Wetzel were absent
  • Need a place for the light
  • Design view of front for the drill motors, arm, claw

Frame, claw section

  • ½" square Al bar
  • no more middle
  • big concern about the actual construction
  • 2 seat motors, with flexible shaft
  • possibly interfere with the control system layout, which is going to be a double-decker design
  • 6 lbs total

Arm

  • shoulder, elbow, wrist, and hand
  • 360 degree elbow
  • pneumatic wrist and hand
  • 120 degree wrist
  • 20 – 34" hand opening size
  • hand will slowly release the ball
  • may now have the shoulder mounted on the back
  • only grab the balls in the front or the back
  • need a mock up
  • SPI: $25
  • Limit switches – when the arm is closed
  • Question about potentiometers
  • Weight = 39 lbs
  • Ready to build

Control system

  • Approximate weight = 25 lbs
  • Did not include the shelf for the control system
  • Need trip mechanism to keep the drill motors from overheating
  • Steering wheel possible
  • Griffen is lead programmer
  • Some material still needs to be ordered
  • SPI: ??
  • 5 limit switches (4 claw, 1 arm)
  • Switch to determine the psi of the pump is always fully charged

 

Overall weight = 118 lbs. (overweight, assuming a 20% design buffer)

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Herndon High School / NASA Headquarters FIRST Robotics Team. Page authored and maintained by Michael Wherley, approved by Dave Lavery, January 20, 2001