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TopicRationaleKey Things to ResearchAssignment
Degrees of Freedom
  • We definitely need to figure out how many degrees of freedom our arm needs to have; this much should be obvious.
  • Selecting the optimum # of DoF will refine our design scope, and give us a better understanding of what linkages we need to fabricate
  •  Will also help us figure out how many motors (+ other OTS components we may need)
  • Recommended DoF for IK
  • Where DoF should be placed on linkages
  • How much we can simplify to reduce design complexity while maintaining function
Linkages
  • Linkages refer to the actual "limbs" of the arm, i.e. shoulder, forearm, wrist, etc.
  • Determining how our linkages should be shaped and how they are commonly constructed will help us select materials and get
    large components with longer lead times fabricated faster
  • This can also help us to prep stuff like cable routing options so its not ham-fisted into the design last second
  • Linkage design (what shapes/geometry are used to minimize weight while maintaining strength and rigidity)
  • Linkages length (would be good to consider this in design, lengths are def TBD rn but its good to find something configurable for when we refine our values)
  • Cable routing options in the linkages
  • It would also be great to determine what kind of machining processes we will need to use to build our linkage so we can plan accordingly
Construction Materials
  • We need to figure out what we will actually build the arm with lol
  • Look into high strength lightweight materials, like carbon composites (which is what most teams use)
  • It would also be great to think of what can replacement materials could be used for prototyping and testing before actual parts are ordered
  • Construction material options and any unique fabrication processes required to use them
  • Potential procurement routes (reach out to sponsors, figure out where we can get stuff and get estimates)
  • CARBON COMPOSITES
BLDC Motors for the Arm
  • While it may be too soon to select motor ratings for our design, we should definitely find a vendor and potential motor options so we aren't left in the
    dust after we find a design
  • It would also be good to get some cost estimates for budgeting 
  • There are also some nuances in motor design that should be research (like what's a pancake BLDC motor?)
  • Potential vendors
  • Potential lines/models of BLDC motors we can use
  • Potential sponsorships and cost estimates for motors

TQ-RoboDrive full sponsorship

Frameless, Brushless motors

Joint Drives/Actuators
  • Joint drives and actuators are a huge topic to research, as they are what actually move the arm
  • There are a number of different options with varying pros and cons - i.e. backlash, cost, implementation, size, reusability, torque/speed ratio, gear reduction, etc.
  • We need to figure out what drives are required at each joint to properly design our robot arm
  • Ideal gear reduction for robot arms
  • What types of drives are suitable at each joints
  • OTS vs custom drive options
  • Cycloid drives, strain wave drives, worm gears, belt drives, bevel/spur gearing, anti backlash gears, backlash solutions, hypoid gears
  • DC motors, servos, steppers, linear actuators, solenoids, pneumatic actuators
End Effector Design
  • This is also straight forward, as the end effector is a huge part of our robot - its what gets shit done at comp
  • The design for the end effector is pretty open ended, so lets try to refine the requirements and think of some good options 
  • Num. of required fingers
  • Gripper materials
  • Range of rotation
  • Clamping strength
  • Tool compatibility 

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