Team John Deere Weekly Status Report Week 10

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Team John DeereWeekly Status ReportWeek 10

• Josh Ebeling
• Jamari Haynes
• James June
• Mike Reno
• Ben Spivey
• Gary Twedt

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Current Design
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Current Design
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Current Design
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Braking Forces
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Braking Forces

• About 40-45 lbs required by user for day to day
  driving, at pedal 8-9 inches of travel
• Translates to 10/22 (45) 18-20 lbs at hand
  controls 15 inches of travel
• Bar should be able to withstand at least 100 lbs
  for safety

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Gas Forces

• About 20 lbs required to fully depress gas pedal,
  2 inches of travel at pedal
• Mechanical advantage is 2.5x, so 5 inches of
  travel at about 8 lbs (possibly adjustable)
• Cable and connections should be able to withstand
  at least 40 lbs for safety

Use ¼ values for sustained use
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Likely Failure Points

• Cable connections must be securely fastened.
• Cable must be designed so that it will not break
  should not be a problem with only 20 lbs of
  force on cable
• Main bar must be securely connected to pivot
  point and existing bar

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Possible Design/Manufacturing Problems

• Main bar should be securely fastened, possibly
  welded in the same fashion as existing brake
  pedal this will make controls more steady
• Cable may experience stretching (creep) should
  design for this so cable can be tightened if/when
  necessary.

Weld to existing pivot bar or constrain so that
sideways motion of handle is limited
Cylindrical sleeve
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Design/Manufacturing Considerations
Installation and usage

• Welding would require professional installation
• Other parts could be installed with standard
  tools.
• Existing pedals would be available to
  non-disabled users. (handle would move when brake
  pedal depresses, though)
• Design so that controls do not interfere with
  existing levers
• Test to insure that parking/startup can be
  achieved with one hand. (using parking brake)

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Action Items

• Decide on specific design of grip/ gas lever
  (consult with ID guys)
• Design method of cable connection at gas pedal.
  (sleeve/bracket, drilled hole)
• Finalize proportions/ materials/ fasteners
• Begin building prototype
• Begin CAD drawings.