Question Sudden shift during pocketing

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?

Hi,

I was having the same experiences. I somewhere read that you have to use a USB cable with a ferrite coil at the beginning and the end. After I bought this cable the problem was gone. Also make sure the ground cable is connect!

Hi,

Most problems in sudden changes or strange behaviour of your machine are communication related (unless you have a corrupted G-code).
Or the USB connection is not stable enough or your computer is preforming other tasks during the milling process.
Another issue can be a time out on the USB port (power safe) of your computer.
Grounding of your machine can help, I don't have that on my machine and have never any problems.