I've run into an issue with the Laguna Swift and Richauto controller shifting the Z-Zero downwards mid-process.
The toolpath is a 3-pass roughing raster running top-to-bottom, stepping left-to-right in the pic, and should be cutting 1/4" each pass. The left most 'plateau' is referencing the original Z-zero and it ran fine. One what must have been the second pass and when I started watching the process again after leaving it on autopilot for the first pass, you can see that about a 1/3 of the way through the machine started stepping down - you can see each subsequent plateau before its started furrowing and stopped the process. I re-checked the Z and found it to be 165 units lower that the original Z-zero level.
I think these resets were happening when the spindle returned to the X-Zero and began its next run down the - it doesn't look like there were any resets along the X-axis once it began the run.
This is new behavior for this machine. It occurred on the next previous job - ruined the blank - and I set that one aside for the current job and have the same behavior.
The bit isn't slipping in the collet, I double-checked the Z-zero before I started.
Has anyone seen this thing before? It feels like an issue with the hardware - the spindle is slipping down?
Thanks in advance for your help.