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Robot Programming Fundamentals

20257m

What are the types of coordinate system of robot? Explain with neat sketch.

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Solution: Types of Robot Coordinate Systems

A robot coordinate system defines how the position and orientation of the robot tool are represented and controlled.

1. Cartesian Coordinate System

Uses three mutually perpendicular linear axes: X, Y and Z.

        Z
        ↑
        |
        |____→ Y
       /
      X

The robot moves the tool along straight X, Y and Z directions. It is commonly used for Cartesian robots and precise linear movements.

2. Cylindrical Coordinate System

Uses:

  • radial motion rr
  • rotational motion θ\theta
  • vertical motion zz
       Z ↑
         |
         |  •
         | / 
         |/ r
        O────────→
          θ

It is suitable for robots performing cylindrical-workspace operations.

3. Spherical / Polar Coordinate System

Uses:

  • radial distance rr
  • two angular coordinates
  • θ\theta and ϕ\phi

The tool position is described relative to a fixed origin using distance and angles.

4. Joint / Articulated Coordinate System

Each robot joint is controlled according to its own joint variable, such as θ1,θ2,…\theta_1,\theta_2,\ldots.

Base → Joint 1 → Joint 2 → Joint 3 → Wrist → Tool
          θ1        θ2        θ3

This is natural for articulated industrial robots.

5. Tool Coordinate System

The origin is attached to the end-effector/tool. Movements are specified relative to the tool's own axes.

6. World / Base Coordinate System

A fixed coordinate frame attached to the robot base or workcell. It provides a common reference for robot motion and other objects.

Comparison

Coordinate system Main variables Typical use
Cartesian X, Y, Z Linear positioning
Cylindrical r,θ,zr,\theta,z Cylindrical workspace
Spherical r,θ,ϕr,\theta,\phi Radial/angular motion
Joint Joint variables Articulated robots
Tool Tool-frame axes End-effector motion
World/Base Fixed reference axes Workcell coordination

Conclusion

Different coordinate systems allow robot motion to be programmed conveniently for different applications. Industrial robot programming commonly uses joint, world/base and tool coordinates together.

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PreviousChoose the correct option/answer the following (Any seven question only): (a) Which component manages the communication and processing tasks within a robot system? (b) The main workspace structure in ROS where packages are built is known as: (c) Lead through programming is primarily associated with: (d) Which sensor is commonly used for mapping and localization in autonomous navigation? (e) In VAL-I/II programming, what are conditional statements used for? (f) Which of the following is responsible for facilitating inter-process communication between different parts of a ROS system? (g) A configuration where a robot's wrist joints align in such a way that the robot loses one or more degrees of freedom is called a: (h) In the RAPID programming language, a command block designed for a specific, simple, and frequent operation that is called upon by the main program is typically a: (i) The command used to synchronize the actions of two or more independent devices (e.g., a robot and a conveyor belt) is the: (j) The application of Computer Vision, AR & VR in Robotics, and Virtual robotics are all topics covered under the study of:NextDiscuss the classification of End Effectors with neat sketches.
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