I did my first real work by cutting holes in an aluminium power supply front. This was my first time using Fusion 360 for CAM work, but I did get some help from a friend working with “real” CNC machines, even though he knew nothing about Fusion 360.
Anyway; this is the result.
I really don’t like the sound it makes, it sounds to me that nothin in my CAM is right.
I am basically looking for helpful tips to make me a better machinist.
Regards;
/jb
If you like reading https://www.cnccookbook.com/chatter-in-machining-milling-lathe-vibration/
Or if you prefer video this playlist is a good start. https://www.youtube.com/watch?v=Bupr_IR-_Pk&list=PL9tn9rGywKUWqqCXlVNEDs1lbSoE6H2a6 (and the rest of the channel should be you go to mealtime entertainment for the next month or so 
lots of good tips)
I did the same for my aluminum project boxes - sure beats the drill and dremel for a clean panel.
The NYC CNC youtube channel is my favourite, but this HAAS video is in my mind the top of heap that I have seen for quickly explaining chatter:
Let us know how it goes on your next aluminum cut - and how the power supply turns out.
The worst part of the sound seems to be related to me placing the machine directly on the desk. Any recommendations of a suitable material to place under the machine?
Getting rid of that sound would make it easier to hear the actual chatter.
Regards;
/jb
Mine sits on four pads of a medium hardness memory foam. The stuff sucks up vibration and the bearing is pretty uniform between the four corners. It sits on top of a sheet steel (reverberant, low stiffness top) small-drawer cabinet that holds tooling. Nearly nothing transfers.
I have mine on a grounded antistatic mat. Double win - sound supression and prevents static buildup when machining plastics in winter.
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