Fusion360: Automatically sized finger-joints

Introduction

In this tutorial, we will learn how to design an open-top box with automatically sized finger joints in Fusion 360. This technique is particularly useful for creating precise cuts for laser engraving machines like the Glowforge. By following these steps, you'll be able to adjust the size and number of finger joints based on the dimensions of your box.

Step 1: Setting Up the Fusion 360 Project

• Open Fusion 360 and create a new design.
• Set your desired units (inches or millimeters) based on your project requirements.
• Create a new sketch on the top plane where you'll design the base of the box.

Step 2: Designing the Box Base

• Use the rectangle tool to draw the outline of your box.
• Specify the dimensions for the width and length of the box.
• Finish the sketch to create the base outline.

Step 3: Creating the Side Panels

• Start a new sketch on one of the sides of the box.
• Draw a rectangle that matches the height of the box and the width of the base.
• Repeat this process for the other three sides of the box.

Step 4: Adding Finger Joints

• Select the edge of one of the side panels where you want to add the finger joint.
• Use the slot tool to create a finger joint.
• Adjust the dimensions of the finger joint based on the thickness of the panels and the number of fingers you want.
• To create multiple fingers, copy and paste the joint and evenly distribute them along the edge.

Step 5: Automating Finger Joint Size

• Set up parameters in Fusion 360 to automate the size of the fingers:
  • Go to the "Modify" menu and select "Change Parameters."
  • Create a parameter for the finger width and height.
  • Use formulas to link these parameters to the dimensions of the box.
• This will allow the finger joints to resize automatically when changing the box dimensions.

Step 6: Finalizing the Design

• Review the entire model to ensure all joints align correctly.
• Use the "Combine" tool to merge the box components if needed.
• Ensure that the design meets the specifications for your laser cutting machine.

Step 7: Exporting the Design

• Once satisfied with the design, go to the "File" menu.
• Select "Export" and choose the appropriate file format (like SVG or DXF) for your laser cutter.
• Save the file and prepare it for cutting on your Glowforge.

Conclusion

You've now created a box with automatically sized finger joints in Fusion 360! This method not only saves time but ensures precision in your projects. As a next step, consider experimenting with different box sizes and joint configurations. For further resources, check out the newer video linked in the description, and explore the provided model on Thingiverse for additional inspiration.