If the length is too large, but the number of occurrences is not high enough, you will have disconnected discs, and the Body computation will fail, as the resulting object must always be a single contiguous solid. You can add more discs by increasing the value of Occurrences in the linear pattern, and by raising the Length, which is the total length of the fake thread.

This will create two discs, one on top of the other. For a fake thread with a pitch of 3 mm, set the Length to 3, and Occurrences to 2, then press OK.

Select the Revolution, then click on PartDesign Linear pattern.

Draw a closed sketch with the required inner diameter 10 mm, outer diameter around 12.6 mm, and pitch 3 mm, but draw only a single tooth of the sawtooth.

Repeat the first two steps from the previous section.

Sectional view of the resulting non-helical thread produced by revolving the sawtooth profile around the vertical axis. Profile used to create the revolution that will simulate a thread. Select Vertical sketch axis, and press OK.

Select the sketch, then click on PartDesign Revolution.

Draw a closed sketch with the required inner diameter 10 mm, outer diameter around 12.6 mm, pitch 3 mm, number of teeth 8, and total height 30 mm.

When 3D printing is not needed, a simulated thread is often sufficient for visualization. Right: simple bolt with a real helical thread. Left: simple bolt with a fake, non-helical thread. This method is good for visualizing a thread-like object, but it is not useful if we need to 3D-print an actual thread. This fake thread is hard to tell apart from the real helical one by simple inspection. We can create a fake thread by using a non-helical path, for example by revolving a sawtooth profile, or by stacking discs with tapered edges. In many cases we don't need real threads, we just need a visual indication that the threads will be there. The Fasteners workbench, by shaise, includes the complete screw maker macro, together with a GUI to select the right component.

In the past the stand-alone Screw Maker macro, by ulrich1a, was used to create individual bolts, screws, and washers.

In the past, the Macro BOLTS was used to insert the parts from the BOLTS library.

An option controls whether an object shows the real thread or just a plain cylinder.

Various standard screws inserted with the Fasteners Workbench. ThreadProfile Workbench, to create common threads.BOLTSFC Workbench, to place fasteners from the BOLTS library.The screws and nuts don't show a thread by default, but this can be controlled with an option. Fasteners Workbench, to add/attach various fasteners to parts.In particular, three resources are recommended that can be installed from the Addon Manager: See the external workbenches page for information on external tools. Using utilities and parts that other people have created is easy and saves time.

Using utilities and parts from workbenches Remember that thread shapes take a lot of memory, and having just one thread in a document can increase the file size significantly, so the user is advised to create threads only when absolutely necessary. Introducing a strategy for designing a bolt without the commonly found problems.Many of the techniques presented here have been collected from different forum threads: However, with the popularization of additive manufacturing (3D printing), there is now a real need to model 3D threads, in order to print them exactly as designed. In traditional systems a thread does not need to be represented directly in 3D space, as it can be indicated with its required characteristics in the 2D technical drawing that is sent for manufacturing. In traditional CAD systems modelling screw threads is discouraged because it puts a big load on the modelling kernel, as well as on the rendering of the shapes. The updated content focuses on the use of the PartDesign Workbench to create the thread. It was updated for v0.19, although the overall process has been essentially the same since v0.14, when the tutorial was originally written. This tutorial is a collection of techniques to model screw threads in FreeCAD. 6.2.2 Profile for arbitrary cross-section.

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