Exploded Views for Assembly Instructions

1. The Purpose of an Exploded View

Before we jump into the "how," let's clarify the "what" and "why." An exploded view is a technical drawing that shows an assembly's components separated from one another, but positioned to illustrate how they fit together. Think of it as a snapshot of the assembly process paused mid-action.

These views are the foundation for:

• Assembly instruction manuals for manufacturing teams.
• Service and repair guides for field technicians.
• Part catalogs for customer support.
• Marketing materials to showcase a product's internal complexity and quality.

As you can see, the core purpose is to communicate the sequence and spatial relationship of parts unambiguously.

2. Creating Your First Exploded View in Onshape

Onshape provides an intuitive and powerful environment for creating exploded views directly within your assembly. The process involves creating a series of "explode steps," where each step defines the movement of one or more components.

To get started, let's walk through the fundamental process of creating and organizing these steps.

Key Principles for a Clear Exploded View

As you saw in the video, creating an exploded view is more than just pulling parts away from each other. It's about telling a story—the story of how the product is assembled. Here are some key principles to follow:

• Follow the Assembly/Disassembly Logic: Explode parts in the reverse order of how they would be assembled. The last part in should be the first part out.
• Move Along Axis: Whenever possible, translate components along their natural assembly axis. This makes the path clear.
• Group Related Hardware: Fasteners, washers, and the component they secure should often be moved together or in sequential steps.
• Don't Overcrowd: Ensure there is enough space between exploded components so that each one is clearly visible. For very complex assemblies, you might create multiple exploded views, one for each major sub-assembly, which is a technique we'll discuss later.

Another useful feature for enhancing clarity is the use of explode lines. These are faint lines that automatically trace the path of a component from its assembled position to its exploded position.

3. Creating the Assembly Instruction Drawing

An exploded view in the 3D environment is the first half of the task. To create a formal assembly instruction document, you need to bring that view into an Onshape Drawing, and supplement it with a Bill of Materials (BOM) and balloon callouts.

This creates a professional, self-contained document that links each part in the view to its description and quantity.

Let's return to our first video to see how this is done.

4. Professional Best Practices

To elevate your work for your portfolio, consider these advanced techniques.

• Use Multiple Exploded Views: For a complex product like the linear actuator from Project 1, a single exploded view can become cluttered and confusing. Onshape allows you to create multiple, independent exploded views in the same assembly. You could have one view for the lead screw sub-assembly, another for the guide rail system, and a final one showing how the major sub-assemblies connect.
• Associativity is Key: One of Onshape's most powerful features, as mentioned in the article from mlaflechecad, is that your exploded views and drawings are fully associative with the master assembly. If you change a part, the assembly, exploded view, and drawing all update automatically. This is a massive time-saver in a real-world iterative design process. Always remember this benefit when documenting your work.
• Enhance Visuals for Clarity: Onshape provides graphics settings to create more compelling technical illustrations. You can adjust line weights to emphasize part edges or use an unshaded mode to create a classic black-and-white "technical manual" look. This can make your instructions even clearer and more professional.

Conclusion

You now have the tools and workflow to create clear, professional, and effective assembly instructions. This is a critical skill that closes the loop on the design process, ensuring your vision can be realized correctly and efficiently by others.

Key Takeaways:

• Exploded views are essential for communicating how components fit together in an assembly.
• A logical exploded view should follow the reverse order of assembly, with parts moving along their primary axes.
• Onshape's Exploded View tool allows you to create, edit, and organize sequential steps for clarity.
• The final deliverable for assembly instructions is typically an engineering drawing that combines the exploded view with a Bill of Materials (BOM) and balloon callouts.
• Leveraging multiple views for complex assemblies and remembering Onshape's associativity are hallmarks of a professional workflow.

Preview of the Next Lesson:

This lesson concludes our module on Design for Manufacturing and Assembly. You've learned how to design for machinability, simplify assemblies, use error-proofing techniques, make strategic sourcing decisions, and now, how to document the final assembly process.

In our next module, we will dive into Advanced Mechanical Components and Powertrains. The first lesson will focus on how to select between a gear train and a belt drive, and calculate required ratios and center distances. This marks a return to detailed component engineering, building on the system-level design principles you've just mastered.