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Mystery milling disparity

Message 1 of 5
186 Views, 4 Replies

Mystery milling disparity

Ok, I'm testing a new CNC and trying to get fusion 360 to work and I'm getting a weird issue where contour dimensions are perfect, but the inner pockets are just weirdly inconsistent.


Can anyone suggest what I'm doing stupid here?!?  I'm pretty sure it's me as I'm new to milling in Fusion, I just can't work out where to debug as there's no pattern I can see between the variances on seemingly identical cut widths!


Width: 200mm Result: 200mm
Height: 100mm Result: 100mm
Pocket 1: 18mm Result: 21mm
Pocket 2: 18mm Result: 25mm
Pocket 3: 18mm Result: 20mm
Pocket 4: 18mm Result: 17mm


As you can see - the outer dimensions are perfect, like digital caliper perfect - so I don’t think there’s any issue with the CNC being spot on.

But the inner pockets are just weird!! It’s just totally inconsistent, so I can’t work out what’s causing it - bit size is correct, it just seems to be a bit bonkers…

Any help/clues most appreciated - I’m certain it’s something stupid I’m doing!


Photos below if it helps!



PXL_20240327_093128244.pngScreenshot 2024-03-27 092952.pngScreenshot 2024-03-27 093019.pngScreenshot 2024-03-27 093053.png

Message 2 of 5
in reply to: alphatester77

We can see that in your last image, there is some overcutting going on. Would you be able to share your Fusion file here?
File > Export > Save to local folder, return to thread and attach the .f3d/.f3z file in your reply.

Seth Madore
Customer Advocacy Manager - Manufacturing
Message 3 of 5
in reply to: seth.madore

Of course - attached!



Message 4 of 5

You had two bodies and i combined them to one body. Regenerated everything and i think it looks better like that?
Always make sure your Model is clean and Fusion will do the rest.




Message 5 of 5

Ah right, so fusion doesn't handle multiple bodies in it's cutting paths... good to know! Thanks for the help!

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