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Learn How to Create and Modify Complex Subassemblies with Subassembly Composer


Subassembly Composer for AutoCAD Civil 3D Tutorial PDF: A Comprehensive Guide




If you are a civil engineer or a designer who works with AutoCAD Civil 3D, you may have encountered the need to create or modify complex subassemblies for your corridor models. Subassemblies are the building blocks of corridors that define the cross-sectional geometry and behavior of the corridor. AutoCAD Civil 3D comes with a library of predefined subassemblies that you can use for various purposes, such as roads, railways, bridges, tunnels, etc. However, sometimes you may need to create your own custom subassemblies that meet your specific design requirements and standards.




subassembly composer autocad civil 3d tutorial pdf



That's where the Subassembly Composer comes in. The Subassembly Composer is a powerful and user-friendly tool that allows you to create and edit subassemblies without any programming knowledge. You can use it to define the geometry, logic, and parameters of your subassemblies using a visual interface and a flowchart. You can then import your subassemblies into AutoCAD Civil 3D and use them in your corridor models.


In this tutorial, we will show you how to use the Subassembly Composer for AutoCAD Civil 3D to create and modify subassemblies. We will cover the following topics:


  • What is the Subassembly Composer and why use it?



  • How to install and launch the Subassembly Composer?



  • What are the main components and features of the Subassembly Composer?



  • How to create a subassembly project and specify its settings and parameters?



  • How to add and edit geometry elements, such as points, links, shapes, curves, etc.?



  • How to add and edit logic elements, such as targets, variables, expressions, functions, etc.?



  • How to preview and test your subassembly geometry and behavior?



  • How to save and export your subassembly as a PKT file?



  • How to import and use your subassembly in AutoCAD Civil 3D?



By the end of this tutorial, you will be able to create your own custom subassemblies using the Subassembly Composer and use them in your corridor models in AutoCAD Civil 3D.


Let's get started!


How to Install and Launch the Subassembly Composer?




The Subassembly Composer is a tool that is included in the installation of AutoCAD Civil 3D. To install and launch the Subassembly Composer, you need to follow these steps:


  • Run the AutoCAD Civil 3D installer and select the Subassembly Composer option from the list of components.



  • Follow the instructions on the screen to complete the installation process.



  • After the installation is finished, you can launch the Subassembly Composer from the Windows Start menu or from the AutoCAD Civil 3D ribbon.



  • To launch the Subassembly Composer from the Windows Start menu, go to All Programs > Autodesk > Autodesk Subassembly Composer 2023 and click on Autodesk Subassembly Composer 2023.



  • To launch the Subassembly Composer from the AutoCAD Civil 3D ribbon, go to the Home tab > Create Design panel > Subassembly Composer icon.



What are the Main Components and Features of the Subassembly Composer?




The Subassembly Composer has a user-friendly interface that consists of four main panels: the Toolbox, the Flowchart, the Preview, and the Properties. Each panel has a specific function and role in creating and modifying subassemblies. Here is a brief overview of each panel:


The Toolbox




The Toolbox contains all the elements that you can use to define your subassembly geometry and logic. The Toolbox is divided into three categories: Geometry, Advanced Geometry, and Auxiliary. Each category has a set of elements that you can drag and drop onto the Flowchart. Some of the elements are:


  • Point: An individual point from which a link can be drawn.



  • Link: A line between two points.



  • Shape: Three or more links connected and closed.



  • Intersection Point: A point of intersection between two links or imaginary lines.



  • Curve: A curved link between two points.



  • Surface Link: A link that follows the specified surface between two points.



  • Fillet Arc: A curved link that connects two links with a specified radius.



  • Auxiliary Point: A point that does not show up in the final result but can be used as a basis for other elements.



The Flowchart




The Flowchart shows you the order and structure of your subassembly elements. The Flowchart is where you add, edit, and organize your elements using a visual interface. You can also add logic elements, such as targets, variables, expressions, functions, etc., to control how your subassembly behaves with different conditions and values. The Flowchart has a toolbar that allows you to zoom, pan, align, group, copy, paste, delete, undo, redo, and save your subassembly elements.


The Preview