I’ve opened a PR in Firmware - G2/G3 z axis coordinated move #473 that should make the helical drilling and pocketing code in ESTLCAM work correctly.
–Edit: updated PR# and link to point to updated/corrected version.
Full confession - I’ve run it in the simulator, but not with a bit in the router and wood.
Tested and appears to work correctly (didn’t have a good ‘Helical drill’ example, but a large arc with a changing Z depth cuts correctly.)
Fantastic! When will this make it in to the stable release?
If it is merged before 11/1, yes. You can vote 
or 
here 
Note that you’ll see a message from GC about the version number not matching GC’s release number, so long as you’re using GC v1.21 or newer the mismatch shouldn’t matter.
Thanks for posting the firmware image. I will see what I can do as far as testing, but don’t go holding your breath. My Maslow is still in a few too many pieces to use, fixing that is on this weekend’s to-do list. Not sure I will get my Z-axis completely assembled this weekend, but I sure intend to try.
Anyhow, thanks a bunch for your efforts, I did vote to get this included. Helical drilling and pocketing are super useful on the smaller machine, I tend to use it by default now, especially when cutting aluminum.
