Relative coordinates simplify the drawing of complex shapes by using a point relative to the last position drawn as a starting point. This guide demonstrates how to draw a geometric shape using relative coordinates in CAD.
Introduction to Relative Coordinates
What are Relative Coordinates?
Unlike absolute coordinates (fixed to the origin), relative coordinates use a starting point based on the last point drawn.
This method is particularly useful for complex 2D and 3D drawings.
Why Use Relative Coordinates?
- Simplifies data entry
- Reduces errors in larger, more detailed projects
Step-by-step guide
1. Design preparation
Activate the Line Command:
- Start by activating the Line Tool
Define the starting point:
- Enter the starting point as (0, 0) using absolute coordinates
2. Drawing Geometry Using Relative Coordinates
The aim is to draw a shape following these steps:
A to B: Horizontal line
- Distance: 2.5 units on the X axis
- Command: @2,5, 0
Explanation:
- The @ symbol indicates relative coordinates
- 2.5 specifies the distance in the X direction
- 0 indicates no movement in the Y direction
B to C: Vertical line
- Distance: 10 units upwards along the Y axis
- Command: @0, 10
Explanation:
- X remains 0 because there is no horizontal movement
- Y is 10 because the line goes upwards
C to D: Horizontal line (to the left)
- Distance: 5 units in the negative X direction
- Command: @-5, 0
Explanation:
- Negative X value indicates movement to the left
D to E: Vertical Line (Down)
- Distance: 5 units down along the negative Y axis
- Command: @0, -5
Explanation:
- Negative Y to move downwards
E to F: Horizontal line (to the right)
- Distance: 2.5 units in the positive X direction
- Command: @2,5, 0
Explanation:
- Positive X indicates movement to the right
F to A: Close Shape
Options:
- Click on the starting point (0, 0) to close the shape
- Alternatively, enter @0, -5 to complete the final segment
3. Accuracy check
- Use measuring tools to confirm that all line lengths and angles correspond to the original project
- Make sure the shape is aligned with the specified dimensions
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