Building a Custom NX Automation Tool Using NX Open

Overview

Many engineering teams perform repetitive operations in Siemens NX, such as creating features, modifying model parameters, updating attributes, checking design data, and generating standard components.

Instead of performing these tasks manually, NX Open can be used to develop custom automation tools that work directly with NX. NX Open supports several programming languages, including C#, Visual Basic .NET, C/C++, Java, and Python.

What is NX Open?

NX Open is a collection of APIs that provides programmatic access to NX functionality.

It allows developers to:

• Automate repetitive design operations

• Access and modify NX model data

• Create custom applications

• Develop custom dialogs and workflows

• Integrate NX with other applications

• Customize the NX user interface

NX also provides journaling capabilities that can record interactive operations and provide a starting point for automation code.

Why Build a Custom NX Automation Tool?

A custom tool can be useful when an engineering workflow involves the same operations repeatedly.

Key Benefits

✔ Reduce manual design work
✔ Improve consistency across models
✔ Speed up repetitive operations
✔ Reduce the possibility of manual errors
✔ Standardize engineering workflows
✔ Create reusable automation solutions

For example, a company may create a tool that automatically reads model parameters, applies predefined design rules, updates attributes, and performs standard checks.

Tools Required

Before developing an NX Open application, you typically need:

• Siemens NX

• NX Open API / Toolkit

• Visual Studio for .NET-based development

• C#, C++, Python, Java, or VB.NET

• NX Open documentation and API references

The exact toolkit and runtime licensing requirements depend on the type of NX Open application being developed.

Step-by-Step Guide

1. Identify the Repetitive Task

Start with a clear engineering problem.

For example:

Manual Process:
Open model → find components → change parameters → update attributes → perform checks

Automated Process:
Run custom tool → select model → automation performs the required operations

Choose a task that is repetitive, rule-based, and easy to define.

2. Record or Understand the Workflow

NX Journaling can be useful for understanding how NX operations map to automation code. A recorded journal can provide a starting point that developers can refine into a more structured application.

3. Choose a Programming Language

Select the language that best fits the project and development team's skills.

Common choices include:

• C# / VB.NET – useful for .NET-based applications

• C++ – suitable for native NX Open development

• Python – useful for scripting and automation

• Java – available for supported NX Open development

NX Open provides a common API approach across supported programming environments.

4. Create the NX Open Application

Create your development project and connect it to the required NX Open libraries.

The application can then access NX objects such as:

• Parts

• Assemblies

• Features

• Bodies

• Parameters

• Attributes

• Drawings

5. Add the Automation Logic

Implement the actual engineering workflow.

For example:

Select Part → Read Parameters → Apply Rules → Update Model → Validate Result

Good automation logic should include appropriate error handling and checks before modifying important model data.

6. Create a Simple User Interface

For tools used regularly by designers, a custom dialog can make the workflow easier.

NX Open provides dialog-development capabilities for creating production-quality dialogs within supported NX environments.

A simple tool could provide options such as:

Select Model → Choose Operation → Run Automation → Display Result

7. Test and Refine the Tool

Test the application with different models and conditions.

Check:

• Does the tool handle missing data?

• Does it work with different model configurations?

• Are the expected objects updated?

• Are errors reported clearly?

• Does the automation produce consistent results?

After testing, optimize the workflow and make the tool easier for engineers to use.

Best Practices

When developing NX Open automation tools:

• Start with a small, well-defined workflow

• Use journals as a learning and prototyping aid

• Keep automation logic modular

• Add proper error handling

• Avoid unnecessary model operations

• Test with different part and assembly configurations

• Create simple and clear user interfaces

• Document the tool for future maintenance

Real-World Applications

NX Open can be used to develop automation solutions for:

• Automated feature creation

• Parameter updates

• Assembly operations

• Model validation

• Attribute management

• Drawing automation

• Design-rule checking

• Batch processing

• Custom engineering workflows

Siemens also highlights NX Open as a way to automate complex and repetitive tasks, integrate third-party applications, and customize the NX interface.

Conclusion

Building a custom NX Automation Tool using NX Open allows engineering teams to transform repetitive manual workflows into standardized and reusable processes.

By combining NX Open APIs, programming skills, engineering rules, and practical automation, developers can create tools that improve productivity and support organization-specific design workflows.

The best way to start is simple: identify one repetitive task, automate it, test it, and gradually expand the solution.

Contact Us

Want to learn NX Open, NX Automation, and NX Customization?

Descode Solutions provides practical CAD automation training focused on real-world engineering applications.

📩 Email: info@descodesolutions.com
📞 Phone: +91 9544 123 321
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