In this Autodesk Fusion 360 Quick Tip video, we will demonstrate how to painlessly achieve chamfers on steep 3D edges, like the one running around the outside edge of our example part. A deep chamfer results in a big gouge if we try to use a Trace operation and a standard chamfer mill. The trick is to use a scalp operation and a ball-and-mill to go along the model chamfer surface.

First, we'll choose the edges of the chamfer as the machining boundary and enable contact point boundary to keep the tool in contact with our selection. Also, we'll set the boundary overlap to zero inches to keep the tool within the selected machining boundary. Finally, we'll reduce this stepover so there's more than one pass along our chamfered surface. The result looks like a good start, but there's a lot of toolpath noise that we don't want and some passes that waterfall over the edge of the part.

A quick tip within a quick tip! We'll show you how to get a cleaner toolpath. First, look at the tolerance value in the Passes tab. Then, in the machining boundary offset, enter a negative offset of three times the tolerance value. In this example, that's -3/10. Now when we generate the scallop, we get a nice clean toolpath that gives us a great looking 3D chamfer!

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