Lesson 4: How to Draw Lines and Arcs Accurately in CAD (How to Avoid the Leaning Tower of Pisa)

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Introduction

This will be the students' first experience drawing lines and circles to exact length, using keyboard entry for line length, relative coordinates to the last point, and 2 simple snap modes (endpoint and center).

First they will see a demonstration of the uses of keyboard entry to control line length, a short introduction to relative coordinates, and snap modes. Then the students will experiment with these methods with teacher directed instructions. After practice, the students will create a new drawing and draw the assignment "Notched Plate" in CAD (see materials list).

Lesson Time

Class periods
2 Class Periods

Industries / Subjects / Grades

Industries / Pathways
  • Engineering & Architecture Engineering & Architecture
    • Architectural Design
    • Engineering Design
    • Environmental Engineering
    • Engineering Technology
  • Information and Communication Technologies Information and Communication Technologies
    • Networking
Grade Levels
  • 11

Objectives and Goals:

Related Instructional Objectives (SWBAT...)

  • Students will be able to open a new file.
  • Students will be able to start a line and control the exact length with keyboard entry of numbers (simple whole and decimal numbers, no fractions or architectural units) .
  • Students will be able to use the "relative coordinate system" to enter placement of lines relative to the last point chosen.
  • Students will be able to use the "Snap Mode" options of "endpoint" and "center" and learn how to turn those snap modes on and off.
  • Students will be able to place circles and control their size with Radius and Diameter input.
  • Students will be able to print a simple drawing to full scale on letter-sized paper.

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