Machining undercuts
This feature is part of an extension. Extensions are a flexible way to access additional capabilities in Fusion. Learn more.
Accessibility Analysis shows you which areas of a part are undercut areas. An undercut area is a recessed surface that is inaccessible when cutting with a standard tool such as a flat end mill.
Example of an undercut area shown in red
Machining undercuts with 3-axis motion
Using the Machine Undercuts parameter, you can generate a 3-axis toolpath to machine undercut areas. Lollipop, disc, barrel, or dovetail tools are best suited for 3-axis undercut machining.
Undercut areas machined by a lollipop tool
Machining undercuts with 5-axis motion
Using the Machine Undercuts parameter and the options in the Multi-Axis tab, you can generate a 5-axis toolpath to machine undercut areas. When compared to 3-axis machining, you can use a wider range of tools during 5-axis machining, including a ball-nosed tool. Generally, using 5-axis motion when machining undercuts gives you the ability to reach more areas of a part in a single operation, which saves you valuable programming time.
Undercut areas are machined by a ball-nosed tool