Using FreeCAD Threads: A Comprehensive Guide

When it comes to creating complex designs in FreeCAD, threads can be a crucial element in ensuring the accuracy and precision of your models. However, using threads in FreeCAD can consume much computing power and is usually not used for models, except for display purposes or sometimes for 3D prints.

In this article, we will explore the different options available when working with threads in FreeCAD, including model threads, threaded holes, ISO and UTS thread profiles, and more. We will also discuss how to define hole parameters and how to use sketches to create holes in your design.

Model Thread Options

When creating a hole feature in FreeCAD, you can choose to model a real thread or leave it unchecked, which will consider the hole as non-threaded. If you choose to model a real thread, you will be able to define the threading data and use the minor diameter of the hole.

ISO and UTS thread profiles enable the size fields, allowing you to customize your threads to specific standards. You can also select the profile type, which can be set to None if no threading information is required.

Hole Parameters

The Hole feature in FreeCAD offers a range of parameters that can be customized to suit your design needs. These include threading and size, fit, hole type (countersink, counterbore, straight), and more.

You can define the hole parameters using the Options section, which provides detailed information on how to set up your holes. Depending on your selection, some fields may activate or remain disabled.

Selecting a Sketch

Before launching the Hole command, you can select a sketch from which to create your holes. If multiple sketches are found, a Select feature panel will appear, allowing you to make a selection.

If an existing unused sketch is found, it will be used automatically, and the generated holes will be identical even if the radii vary. Countersunk (to the left) and counterbored (to the right) holes can also be created using this method.

Positioning Holes

The centers of circles and arcs are used to position the holes, but please note that their radii are not taken into account. All non-arc/circle entities are ignored, but they must still form closed contours.

If arcs are present, they must be part of closed contours. The Hole feature creates one or more holes from a selected sketch's circles and arcs.

In conclusion, using threads in FreeCAD is a powerful tool for creating complex designs with precision and accuracy. By understanding the different options available when working with threads, including model threads, threaded holes, ISO and UTS thread profiles, and more, you can create custom-designed holes that meet your specific design requirements.

Whether you are working on a 3D print or simply want to add details to your design, FreeCAD's Hole feature provides a range of options for creating precise and accurate holes. By following the guidelines outlined in this article, you can master the art of using threads in FreeCAD and take your designs to the next level.

Using freecad threads