Simultaneous 4th axis machining with Fusion 360

4th Axis CAM  and 4th Axis machining can be handled in one of two ways: positional or simultaneous. Positional 4th Axis, or 3+1 machining, involves moving the 4th axis of the machine in between cutting material. This comes in handy when for example you need to machine a piece of roundbar to have a square on the end – each side of the square is its own distinct plane, so the 4th axis only needs to move in between cuts.

Simultaneous 4th Axis (sometimes called true 4th axis) machining involves the 4th axis moving at the same time (simultaneously) as the X, Y, and Z axes of a traditional mill. Paired with some AWESOME toolpaths in Fusion 360 this allows us to machine features that would normally require surfacing or otherwise be impossible to machine without simultaneous 4th axis machining.

The video above demonstrates this technique. See more at NYC CNC.


As 2022 starts, let’s take some time to share our goals for CircuitPython in 2022. Just like past years (full summary 2019, 2020, and 2021), we’d like everyone in the CircuitPython community to contribute by posting their thoughts to some public place on the Internet. Here are a few ways to post: a video on YouTub, a post on the CircuitPython forum, a blog post on your site, a series of Tweets, a Gist on GitHub. We want to hear from you. When you post, please add #CircuitPython2022 and email circuitpython2022@adafruit.com to let us know about your post so we can blog it up here.

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