Toltech

Toltech is a desktop application for mechanical tolerance analysis and variability calculation.

The project provides tools to model mechanical assemblies, define tolerances and functional requirements, and analyse their influence on assembly behaviour.

Features

• Mechanical assembly modelling
• Parts and mechanical linkages management
• Geometrical tolerance definition
• Functional requirements definition
• Tolerance and variability calculations
• Graph-based mechanical modelling
• Small-displacement torsor modelling
• Calculation result visualisation
• 3D visualisation
• SQLite-based model storage
• JSON result persistence
• CAD integration
• FreeCAD integration
• Multilingual user interface

Screenshots

## Architecture

Toltech is organised into several components:

Toltech
│
├── Toltech.App
│   └── WPF application
│
├── Toltech.ComputeEngine.Contracts
│   └── Solver contracts and DTOs
│
├── Toltech.Solver
│   └── Mechanical and mathematical calculations
│
├── Toltech.Cad
│   └── Generic CAD abstraction
│
└── Toltech.FreeCAD
    └── FreeCAD integration

The WPF application communicates with the calculation engine through dedicated contracts and data transfer objects.

The solver is designed to remain independent from the WPF user interface.

Technology

• C#
• .NET 8
• WPF
• MVVM
• SQLite
• JSON
• HelixToolkit.Wpf
• FreeCAD
• CSparse
• MathNet.Numerics

Solver

The Toltech.Solver project targets .NET 8 and provides the calculation engine used by Toltech.

The solver is currently not publicly available. To allow the application to be used and demonstrated without access to the calculation engine, Toltech provides a FakeSolver implementation that simulates solver responses with realistic data.

The solver currently uses:

• CSparse 4.2.0
• MathNet.Numerics 5.0.0

The solver is also configured to generate a NuGet package when the project is built.

Getting Started

Requirements

• Windows
• .NET 8 SDK
• Visual Studio 2022 or compatible .NET development environment
• FreeCAD for CAD-related features

Build

Clone the repository:

git clone <repository-url>
cd Toltech

Restore the dependencies:

dotnet restore

Build the solution:

dotnet build

To build the solver independently:

dotnet build Toltech.Solver

The Toltech.Solver project is configured to generate a NuGet package when the project is built.

Run

Start the WPF application from Visual Studio, or use:

dotnet run --project Toltech.App

Documentation

Technical documentation is available in the project documentation.

Contributing

Contributions, bug reports and suggestions are welcome.

Please ensure that the solution builds successfully before submitting changes.

License

Copyright © 2026 Louis PERIER.

All rights reserved.

Status

Toltech is currently under development.