Newbie here. I’m using a Shapeoko 3 XXL. I’ve been doing quite a bit of research about speeds and feeds when it comes to machining aluminum, but my first attempts seem to run pretty well for about 15 seconds or so… Then the end mill seems to get sucked into the material. I’m using Inventor CAM (basically Fusion 360) to create my toolpaths. I used face and pocket operations in the pictures shown. For both of which I’m using a 1/4", 3-flute, TiCn coated end mill at 16000 rpm, with a 48 in/min feedrate, .015" DOC and a .125" stepover. I got these numbers from Winston Moy’s video that talks about cutting aluminum on the Shapeoko.
As I said before, it seems to run just long enough to slightly build my hopes and then the bit will get sucked into the aluminum over 1/8". Any tips would be greatly appreciated.