Today I (beginner) was pocketing wood with a 6mm ball mill with a Stepcraft D600 and an AMB 1050. As shown in the attached image, the center position suddenly changed with about 8mm in the x-axis. There did not seem to be any obstruction or other mechanical problem. A while ago, a sudden change in the Z-axis position also occurred (fortunately going up). I calculated my feed rate using the Stepcraft instruction, using a RPM of 18.000 and a feed rate of 3420. I'm using Fusion 360 for making the G-codes (and the simulation was OK), using WINPC-NC USB as software.
Does anybody know what the most likely problems are?