What Are Configuration Tables in CAD?
Configuration tables are spreadsheet-driven tools embedded within Computer-Aided Design (CAD) software that allow designers to generate and manage multiple variations of a part or assembly from a single master model. This article provides a clear overview of how configuration tables function, their primary applications in engineering workflows, and how they streamline parametric modeling to save time and eliminate redundant files.
Understanding Configuration Tables
In parametric CAD systems like SolidWorks, Autodesk Inventor, PTC Creo, and Onshape, a configuration table (often implemented as a design table via embedded spreadsheets like Microsoft Excel) links numerical parameters and feature states directly to the CAD geometry.
Rather than modeling several separate files for components that share the same basic shape but differ in scale or features, a designer creates one base model. The configuration table then acts as a matrix: each row typically represents a unique configuration or part number, while the columns correspond to specific dimensions, feature suppression states, material properties, or metadata.
How Configuration Tables Are Used in CAD
1. Managing Standard Hardware and Fasteners
The most common use of configuration tables is generating standard component libraries. Fasteners, such as bolts, nuts, and washers, share identical geometric topology but vary in thread size, length, and diameter. A single bolt model can contain hundreds of standard sizes controlled entirely by values defined in the table.
2. Sizing Product Families
Manufacturers producing equipment in various capacities (such as valves, pipe fittings, structural brackets, or enclosures) use configuration tables to scale geometries automatically. Changing a bore diameter, overall length, or mounting hole pattern requires only entering the new values into the table, which updates the CAD model accordingly.
3. Feature Suppression and Alternate Geometries
Configuration tables control more than just dimensions; they can toggle features on or off (suppress or unsuppress). For example, a single sheet metal chassis model can have configurations for left-hand vs. right-hand orientations, versions with or without cooling vents, or models featuring different connector cutouts.
4. Assembly States and Representations
At the assembly level, configuration tables control which components are active, their positions, or their display states. Engineers use them to show:
- Different operational positions (e.g., a hydraulic cylinder extended versus retracted).
- Alternate sub-assemblies or optional modular attachments.
- Simplified representations where complex internal hardware is suppressed to improve software rendering performance.
5. Automating Bills of Materials (BOM) and Metadata
Configuration tables allow unique custom properties to be assigned to each variant. Part numbers, descriptions, vendor information, mass, and finish specifications can be mapped directly to each row. When the configured part is placed into an assembly drawing, the Bill of Materials automatically populates the correct metadata corresponding to that specific variation.
Key Benefits
By centralizing variations within a single source file, configuration tables reduce storage requirements, minimize human error, and ensure design consistency. When the base geometry requires an update, modifying the master model propagates changes across all variations instantly, drastically reducing design maintenance time.