Hello,

I got a 6040 China CNC and I wanted to mill some aluminium with it. I am completly new to CAM and CNC so I Used Fusion 360 to create the model and the CAM Module from Fusion 360 to create the G-Code for Mach3.
I have used a Carbide 6mm bit with 2 flutes as I was told that is best suited to mill aluminium.
And I have used those settings in the CAM module to mill. Cut feed rate is 100mm/min. Plunge and Ramp feed rate is 30mm/min and Lead in/out feed rate is 50mm/min. I mill in several passes with 0.1mm depths each and the spindle is set to 10000rpm.
The problem that I have is that in the last pass when the bit cuts thru the bottom of the part, the bit catches the thin rest with the flutes and then it grabs the workpice.

The bit then cuts chuncks out until it breaks.

I guess I am doing something wrong, but have no idea where to start.