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Robotics
Robot coined by Karel Capek in a 1921 science-fiction Czech play
Definition:

A robot is a reprogrammable, multifunctional manipulator designed to move
material, parts, tools, or specialized devices through variable programmed
motions for the performance of a variety of tasks. (Robot Institute of America)
Alternate definition:
A robot is a one-armed, blind idiot with limited memory
and which cannot speak, see, or hear.

MITs Kismet: a robot
which exhibits expressions,
e.g., happy, sad, surprise,
disgust.
Ideal Tasks
Tasks which are:
 Dangerous
 Space exploration
 chemical spill cleanup
 disarming bombs
 disaster cleanup
 Boring and/or repetitive
 Welding car frames
 part pick and place
 manufacturing parts.
 High precision or high speed
 Electronics testing
 Surgery
 precision machining.
Automation vs. robots



Automation Machinery designed to carry out a specific task
 Bottling machine
(These are always better
than robots, because they
 Dishwasher
can be optimally designed
 Paint sprayer
for a particular task).



Robots  machinery designed
to carry out a variety of tasks
 Pick and place arms
 Mobile robots
 Computer Numerical Control
machines
Types of robots


Pick and place
 Moves items between points
A SCARA robot (Selective Compliant
Articulated Robot Arm): A pick-andplace robot with angular
x-y-z positioning (Adept Technology)



Continuous path control
 Moves along a programmable path
A six-axis industrial robot ($60K)(Fanuc
Robotics), but an additional $200K is often
spent for tooling and programming.



Sensory
 Employs sensors for feedback
Pick and Place


Moves items from one point to
another



Does not need to follow a specific
path between points



Uses include loading and
unloading machines, placing
components on circuit boards, and
moving parts off conveyor belts.

A cartesian robot for picking and
placing circuits on circuit-boards
Continuous path control


Moves along a specific path



Uses include welding, cutting,
machining parts.

Robotic seam welding
Sensory


Uses sensors for feedback.



Closed-loop robots use sensors in
conjunction with actuators to gain
higher accuracy  servo motors.



Uses include mobile robotics,
telepresence, search and rescue, pick
and place with machine vision.
Measures of performance


Working volume
 The space within which the robot operates.
 Larger volume costs more but can increase the
capabilities of a robot



Speed and acceleration
 Faster speed often reduces resolution or
increases cost
 Varies depending on position, load.
 Speed can be limited by the task the robot
performs (welding, cutting)



Resolution


Often a speed tradeoff



The smallest step the robot can take
Performance (cont.)
 Accuracy
The difference between the
actual position of the robot and
the programmed position
 Repeatability
Will the robot always return to the
same point under the same
control conditions?
Increased cost
Varies depending on position,
load
Control
Open loop, i.e., no feedback, deterministic
Closed loop, i.e., feedback, maybe a sense of
touch and/or vision
Kinematics and dynamics


Degrees of freedomnumber of independent motions





Translation--3 independent directions
Rotation-- 3 independent axes
2D motion = 3 degrees of freedom: 2 translation, 1 rotation
3D motion = 6 degrees of freedom: 3 translation, 3 rotation
Kinematics and dynamics (cont.)




Actions
 Simple joints
 prismaticsliding joint, e.g., square cylinder
in square tube
 revolutehinge joint
 Compound joints
 ball and socket = 3 revolute joints
 round cylinder in tube = 1 prismatic, 1
revolute
Mobility
 Wheels
 multipedal (multi-legged with a sequence of
actions)
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Robotics

  • 2. Robot coined by Karel Capek in a 1921 science-fiction Czech play
  • 3. Definition: A robot is a reprogrammable, multifunctional manipulator designed to move material, parts, tools, or specialized devices through variable programmed motions for the performance of a variety of tasks. (Robot Institute of America) Alternate definition: A robot is a one-armed, blind idiot with limited memory and which cannot speak, see, or hear. MITs Kismet: a robot which exhibits expressions, e.g., happy, sad, surprise, disgust.
  • 4. Ideal Tasks Tasks which are: Dangerous Space exploration chemical spill cleanup disarming bombs disaster cleanup Boring and/or repetitive Welding car frames part pick and place manufacturing parts. High precision or high speed Electronics testing Surgery precision machining.
  • 5. Automation vs. robots Automation Machinery designed to carry out a specific task Bottling machine (These are always better than robots, because they Dishwasher can be optimally designed Paint sprayer for a particular task). Robots machinery designed to carry out a variety of tasks Pick and place arms Mobile robots Computer Numerical Control machines
  • 6. Types of robots Pick and place Moves items between points A SCARA robot (Selective Compliant Articulated Robot Arm): A pick-andplace robot with angular x-y-z positioning (Adept Technology) Continuous path control Moves along a programmable path A six-axis industrial robot ($60K)(Fanuc Robotics), but an additional $200K is often spent for tooling and programming. Sensory Employs sensors for feedback
  • 7. Pick and Place Moves items from one point to another Does not need to follow a specific path between points Uses include loading and unloading machines, placing components on circuit boards, and moving parts off conveyor belts. A cartesian robot for picking and placing circuits on circuit-boards
  • 8. Continuous path control Moves along a specific path Uses include welding, cutting, machining parts. Robotic seam welding
  • 9. Sensory Uses sensors for feedback. Closed-loop robots use sensors in conjunction with actuators to gain higher accuracy servo motors. Uses include mobile robotics, telepresence, search and rescue, pick and place with machine vision.
  • 10. Measures of performance Working volume The space within which the robot operates. Larger volume costs more but can increase the capabilities of a robot Speed and acceleration Faster speed often reduces resolution or increases cost Varies depending on position, load. Speed can be limited by the task the robot performs (welding, cutting) Resolution Often a speed tradeoff The smallest step the robot can take
  • 11. Performance (cont.) Accuracy The difference between the actual position of the robot and the programmed position Repeatability Will the robot always return to the same point under the same control conditions? Increased cost Varies depending on position, load
  • 12. Control Open loop, i.e., no feedback, deterministic Closed loop, i.e., feedback, maybe a sense of touch and/or vision
  • 13. Kinematics and dynamics Degrees of freedomnumber of independent motions Translation--3 independent directions Rotation-- 3 independent axes 2D motion = 3 degrees of freedom: 2 translation, 1 rotation 3D motion = 6 degrees of freedom: 3 translation, 3 rotation
  • 14. Kinematics and dynamics (cont.) Actions Simple joints prismaticsliding joint, e.g., square cylinder in square tube revolutehinge joint Compound joints ball and socket = 3 revolute joints round cylinder in tube = 1 prismatic, 1 revolute Mobility Wheels multipedal (multi-legged with a sequence of actions)