3D Adaptive: Need some advice

[Anonymous]

Hi,

I would like to ask the community for some advice. I more or less just started using Fusion 360 and facing obstacles I don't know how to handle. This time it is about the 3D Adaptive milling strategy. Both questions I've got are not really heavy problems but in order to learn Fusion 360 CAM I wonder how to overcome them. I attache the project file to this post so you can - if you like - take a look to the operations.

So here we go:

1. Material left over after milling (1st operation)

Every now and then I get areas where the 3D Adaptive milling strategy does left over some material. Please see the screenshot below. The area is marked with a red arrow. I know it is very very thin but I nevertheless would love to know if there is anything I could do to get Fusion not leaving over that material. What you see in the screenshot is the result after the first operation has finished.

2. 3D Adaptive Rest Machining (2nd operation)

Marked with red arrows you see in the screenshot below the areas where the tool is not reaching the bottom of the pocket as I want it to do. It leaves over 0.9mm more than I want it to do. Both operations, the former one as well as this one are configured to leave 0.1mm stock axial. The first operation does what I want it to do but this second one doesn't and I have no idea how to get it to not to leave even more stock there. Marked with green arrows are the areas where it does leave over exactly the 0.1mm as I want it to do. Very strange to me...

Well, I would highly appreciate if someone could help me figuring out how to overcome these two things, thanks.

[LibertyMachine]

To answer your first question;

Changing the step-over to .65mm did away from the little artifacts being left on the top surface.

On the second question; I'd like to give you an exact answer, but it's still trying to calculate. The desktop I'm on is several years old and it appears to be at the end of it's Fusion existence. I suspect it's your Max and Min stepdowns in combination with your "Stock to Leave" that is causing this issue. One thing to note; Adaptive is not meant to be a finishing pass. It's not (generally speaking) capable of producing a clean wall finish, as it's method of entering and exiting cuts leave a fragmented appearance

I'm 24 minutes into calculating your Rest machine and it's at 30%

[Anonymous]

Thank you so much for investing your weekend's time for this. I'm looking forward what you come up with...

[LibertyMachine]

And for the second issue, now that my computer has decided to get with the program;

Turn on "Machine Cavities" and turn off "Flat Area Detection". It will proceed as expected. However, it might be more expedient for you to make more targeted selections to fine tune where it cuts and how it behaves. You can do this with Selections

[Anonymous]

Again thanks a lot for your help!

Here's what I learned:

Issue #1:

There is nothing you can do but play with the width of cut until you find something where nothing is left over. I wish there would be a better solution to this. Even better would be if the tool path calculation implementation would recognize these spots and just doesn't forget about them.

Issue #2:

Very cool, that worked indeed. Honestly I have no idea why it works using these settings but at least it does. In the end I learned that there is still room for learning... 😉

Again thanks!