Скачать или смотреть Freecad tutorial - GEARS creation

Freecad Tutorial - Gears Creation
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FreeCAD provides tools and workbenches that allow users to create and manipulate gears easily, making it useful for designing mechanical components with accurate gear geometries. The primary way to work with gears in FreeCAD is through the "Gear" workbench or by using the "Part Design" and "Part" workbenches for custom shapes.

Here's an overview of how gears work in FreeCAD:

1. Gear Workbench:
The Gear Workbench (often added through the Fasteners or the Gear module if not installed by default) provides an easy-to-use toolset specifically for generating common gear types, such as spur gears, involute gears, and helical gears.
It offers parameters to define gear properties such as number of teeth, pressure angle, module, pitch diameter, and helix angle.
With these tools, users can quickly create 3D models of gears suitable for simulation or for creating engineering drawings.
2. Types of Gears Available:
Involute Spur Gear: Most common type of gear. FreeCAD can generate these based on typical parameters like the module, number of teeth, and pressure angle.
Helical Gear: Similar to a spur gear but with teeth at an angle, allowing smoother transmission. The Gear Workbench can create these, with control over the helix angle.
Bevel Gear: Typically not included by default but can be generated through specific add-ons or by using scripts. These are used to transfer motion at an angle (e.g., 90 degrees).
Rack and Pinion: Also achievable with custom settings or scripting to create linear gear tracks.
3. Creating Gears:
Parameters: Users can input specific gear parameters such as module (size of the teeth), pressure angle (angle of tooth contact), number of teeth, and width.
Customization: You can customize these parameters to create both standard and non-standard gears. For example, you can adjust the backlash or tooth depth for specialized applications.
Scripting: FreeCAD supports Python scripting, which allows users to automate gear creation. This is helpful for generating complex gear trains or for creating custom gear types like worm gears.
4. Working with Gears in Assemblies:
Gears created in FreeCAD can be placed into assemblies with the Assembly workbenches (e.g., Assembly3 or Assembly4 add-ons).
By positioning gears correctly, you can simulate mechanical systems and ensure correct meshing and alignment.
You can also use constraints to define gear rotations and simulate the movement of mechanical assemblies.
5. Exporting Gears for Manufacturing:
After designing a gear, FreeCAD allows you to export the model in various formats, including STEP, STL, or DXF.
These formats are compatible with most CAM software for 3D printing, CNC machining, or laser cutting.
6. Add-ons and Advanced Options:
Fasteners and Gear Modules: FreeCAD has additional modules, such as the Fasteners add-on, which sometimes includes gear tools if not already present in the installation.
Parametric Design: FreeCAD’s parametric capabilities allow users to change gear parameters and update the entire model instantly, making it ideal for iterating gear designs.
Using FreeCAD's gear tools, you can create complex mechanical designs, validate geometries, and prepare models for manufacturing.