I think I'm having the same problem. Please, could somebody tell me if it's the case or something else. I was thinking it was more of a tool geometry problem. Am I using it the correct way?
Taig cnc mill with 3/8" shanked fly cutter (part number: 1224ER)
The cutter is the one included : right hand cutting
Material : aluminum 6061-T6
I set the tool at about 2" wide. My piece of stock is 1.5" wide
0.05" deep single pass
1100 rpm (lowest)
10 in/min
Thanks for the help
On the picture : I stopped in the middle of a pass (going left to right) to show you the difference, but it not as clear as when it happened the first time. The right side on the picture is the correct finished one (but we can still see marks from the first try). It was all good until the tool started "dragging" just enough to mess up the finish. We can see chips from the tool going forward and the dusty stuff produced by the tool "dragging". We can also see the burr created on the sides by the "drag".