After some experimenting I managed to get a nice result with reliable reproducibility. I used a 1/8" 4 flute down cut carbide end mill. I ramped into the work at 3 degrees. I initially thought that since the sheet was less than half a millimeter thick, I could plunge straight down into it. I destroyed a few end mills learning this lesson. To eliminate chatter I enabled trochoidal milling. This let me run at a high feed rate of 36mm/s without issue. Trochoidal milling by itself left a very slightly rough finish, so I added a finishing pass of the default value of 5% tool diameter and all cuts were then very smooth. Looks like it can cut steel after all.
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