Assembly Design in FreeCAD

Learn how to use FreeCAD's Assembly workbench to combine parts into functional assemblies using constraints.

Introduction to Assembly Design

Assembly design is a crucial phase in CAD modeling where you combine multiple parts into a single functional unit. This lesson covers the basics of using the Assembly workbench in FreeCAD to connect parts with constraints, ensuring they move together as intended.

Using the Assembly Workbench

1. Overview:
   • The Assembly workbench in FreeCAD allows you to create mechanical assemblies by defining relationships (constraints) between separate parts.
2. Key Concepts:
   • Parts: Independent models created in other workbenches.
   • Constraints: Rules that define how parts align and move relative to each other.

Steps to Create an Assembly

Example Project: Constructing a Swivel Chair

• Components:
  • Base, seat, backrest, and wheels.

Assembly Process

1. Import Parts:
   • Start by importing your previously designed components into the Assembly workbench.
2. Add Constraints:
   • Use constraints like axial align, angular, coincident, and distance to position parts relative to each other.
   • For example, align the wheels symmetrically around the base using circular pattern constraints.
3. Check Movements:
   • Simulate movements to ensure parts operate without interference, adjusting constraints as necessary.

Practical Exercise: Assembling a Simple Engine

• Objective: Use the Assembly workbench to construct a simple piston engine.
• Steps:
  • Import parts such as the crankshaft, pistons, and cylinder block.
  • Apply axial and rotational constraints to ensure the pistons move correctly within the cylinder as the crankshaft rotates.

Lesson Assignment

Create an assembly of a small gearbox. Design or import gears, a casing, and a shaft. Use constraints to assemble the gearbox, ensuring that gears mesh correctly and the shaft rotates freely within the casing.

Additional Resources

• FreeCAD Assembly Workbench Guide
• Interactive Tutorials on Assembly Design

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