[DL62] From Sketches to 3D Models: Extrude Feature

M3D DesignLab DesignLab Grade 6
1

Session 2: “From Sketches to 3D Models: Extrude Feature”

Architect:
Syed Shayaan Haider - Markhor3D

Session Overview

In this session, Grade 6 students will learn how to transform their 2D sketches into 3D models using OnShape’s extrude feature. Building on the closed sketches they created in Session 1, students will discover how to add depth to their designs by extruding them. They will create basic 3D shapes—such as boxes, cylinders, and other enclosed figures—and learn how precise 2D sketches lead to accurate 3D models. This session sets the stage for more advanced modeling by demonstrating the critical connection between careful 2D drafting and successful 3D design.

Placeholder for OnShape extrude demonstration image: [Google Image Search “OnShape extrude feature demonstration”]

Learning Objectives

By the end of the session, Grade 6 students will be able to:

  • Understand Extrusion: Explain that extrusion is the process of adding depth to a 2D sketch to create a 3D model.
  • Select Closed Sketches: Identify and select closed sketches that are ready for extrusion.
  • Use the Extrude Tool: Convert 2D sketches into basic 3D shapes, such as boxes, cylinders, and other enclosed figures.
  • Modify 3D Models: Adjust the extruded shapes (e.g., changing height or depth) to match design requirements.
  • Appreciate the 2D-to-3D Transition: Recognize how the accuracy of the 2D sketch affects the quality and precision of the resulting 3D model.

Teaching Aids

Visual Aids:

  • Placeholder: [Google Image Search “OnShape extrude feature demonstration”] – to show a step-by-step extrude process.
  • Placeholder: [Google Image Search “OnShape closed sketch examples”] – to illustrate good closed sketches ready for extrusion.
  • Placeholder: [Google Image Search “OnShape basic 3D shapes”] – to display examples of extruded shapes like boxes and cylinders.

Required Equipment:

  • Computers or Tablets:
    • One per student or pair, with OnShape logged in and the sketches from Session 1 available.
  • Interactive Whiteboard or Projector:
    • For live demonstrations of the extrude process.
  • Notebooks and Pens:
    • For students to jot down key steps and observations.
  • Assistants or Volunteers:
    • Additional support to help students navigate the software and troubleshoot issues.

Structure and Lesson Plan (Total Time: 60 minutes)

1. Introduction and Recap (10 minutes)

  • Welcome:
    • “Good morning, Grade 6! Today, we’re going to turn your 2D sketches into 3D models using the extrude feature in OnShape.”
  • Recap Session 1:
    • “Last session, you learned how to create precise, closed 2D sketches using lines, arcs, and curves. Can someone remind us why having a closed sketch is important?”
  • Session Overview:
    • “Today, we will focus on extruding these sketches. We’ll learn how to add depth and transform your 2D drawings into tangible 3D objects, like boxes and cylinders.”

2. Explanation of Extrusion (10 minutes)

  • Define Extrusion:
    • “Extrusion is the process of adding height (or depth) to a 2D sketch, turning it into a 3D object. Think of it as pulling your flat drawing upward to give it volume.”
  • Importance of Closed Sketches:
    • “Only closed sketches—where all lines connect—can be extruded. This is why your careful work in Session 1 is so important.”
  • Discuss Dimensions in Extrusion:
    • “When extruding, you set a specific height. This height determines how thick or tall your 3D model will be, so precision here is key.”

3. Demonstration of the Extrude Feature in OnShape (15 minutes)

  • Live Demonstration:
    • Step 1: Open a Sketch
      • “From your document, open a sketch you created in Session 1 that is a closed figure.”
    • Step 2: Access the Extrude Tool
      • “Select the sketch, then click the ‘Extrude’ button. This tool is usually found in the toolbar.”
    • Step 3: Set Extrusion Parameters
      • “In the properties panel, enter the height you want for your model. For example, you might set it to 10 mm for a basic box shape.”
    • Step 4: Apply and View the 3D Model
      • “Click ‘Done’ to extrude your sketch, and use the camera controls to view your new 3D model from different angles.”
  • Emphasize Flexibility:
    • “You can always go back and adjust the height if your design needs more or less depth.”
  • Placeholder: [Google Image Search “OnShape extrude feature demonstration”]

4. Hands-On Activity: Extruding Your Sketches (15 minutes)

  • Activity Instructions:
    • “Now it’s your turn! Open one of your closed sketches from Session 1 and use the extrude feature to create a 3D model. Try creating different shapes like a box, a cylinder, or any enclosed figure you’ve drawn.”
  • Encourage Experimentation:
    • “Experiment with different extrusion heights to see how it changes your model. Use the measurement tools to ensure your dimensions are precise.”
  • Teacher and Assistant Support:
    • Circulate the room, providing assistance and ensuring students are correctly using the extrude tool.

5. Sharing and Feedback (5 minutes)

  • Student Sharing:
    • “Who would like to share the 3D model they created from their sketch? Explain what you extruded and the height you used.”
  • Encourage Peer Feedback:
    • “Listen to your classmates and think about any ideas or improvements you could try in your next model.”
  • Teacher Feedback:
    • “Great job, everyone! Your 3D models show that precise 2D sketches make for strong and accurate 3D objects.”

6. Conclusion and Next Steps (5 minutes)

  • Summarize the Session:
    • “Today, you learned how to turn your 2D sketches into 3D models using the extrude feature. You saw how important it is to work with closed sketches and to set precise dimensions.”
  • Preview the Next Session:
    • “Next time, we’ll build on these skills by adding more details to your 3D models and exploring advanced features.”
  • Closing Encouragement:
    • “Keep practicing your extrusions and remember, the precision you set now is key to creating great 3D models in the future!”

Glossary

  • Sketch: A 2D drawing on a plane that serves as the blueprint for a 3D model.
  • Extrusion: The process of adding depth to a 2D sketch to create a 3D object.
  • Closed Figure: A sketch where all lines connect, forming a complete boundary necessary for extrusion.
  • Dimensions: Exact measurements that define the size of your shapes.
  • Line Tool: A tool used to draw straight lines in a sketch.
  • Arc Tool: A tool used to draw curved segments in a sketch.
  • Curve Tool: A tool for drawing freeform curves.
  • Orbit, Pan, Zoom, Rotate: Camera controls in OnShape that allow you to view your model from different angles.

For suggestions, improvements, and corrections, feel free to reach out at shayaanhaider@gmail.com