When modeling custom threads, which command do you use to create a body by sweeping a cross section along a path where the shape of the section varies along the path?

To create a body by sweeping a cross-section along a path where the shape of the section varies, the correct approach is using the Variational Sweep command. This functionality is designed specifically for situations where the profile of the cross-section changes along the length of the path, allowing for the creation of complex shapes such as custom threads.

Variational Sweep offers more flexibility compared to other sweep options, enabling the user to define a varying profile, which is essential in modeling threads that have a custom or non-uniform cross-section. This capability is critical in producing models that accurately reflect the intended design characteristics, particularly in areas requiring precise geometry, like threads.

Other options such as Swept Volume, Styled Sweep, and Helical Sweep cater to different sweeping needs but do not specifically support the requirement for a varying cross-section along the path. For instance, Helical Sweep is typically used for creating bodies that follow a helical path with a fixed cross-section, while the Styled Sweep is generally for more static shapes without the variability needed in this context.