Drilling and Carving Issues

[ronby]

Can someone explain to me why my CNC machine always taking a dive when carving or drilling? I have a Stepcraft D840 ATC. Every time I carve or drill somewhere in the process the bit just take a dive and mess up my whole work piece. The machine is leveled runs smooth ATC works ok. The preview of the toolpath look good, but I just can't stop it from going scuba diving without water.Attachment 439227

Here is a video on my YouTube channel.
https://youtu.be/21WOAp7HfxI

[aylo6061]

Why does it stop moving? Is that the end of the program, or does it throw an error?

Looks odd- is your tool by any chance getting yanked out of the collet?

want to post your G code? I doubt its the issue but its always worth inspecting to make sure its not the problem.

--A