When going to the “work origin” the Z Axis should normally be the last axis to move. I have identified that sometimes the Z Axis is the last to move but sometimes it is first. Work holding on the periphery of the model is in danger if the ZAxis goes straight down from Home and then moves the X and Y axis. Only one broken endmill and am more careful now. Been awhile since I used Mach3; I believe the Z axis is last to move in that program.
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Hi all, and especially the developers of the firmware 
,
thats a point, I’d like to recommend to change in one of the next firmware updates.
I use a A350 and started testing the CNC carving mode of the machine.
To precise the issue “pta00066” mentioned, it will happen when you use the SM 2.0 in CNC carving mode.
When you have set the work origin and move back to home by using the button on touchscreen, the first axis is Z which moves out of the work area, then X and Y in that order. Using “Go to Work Origin” button, I’d have expected that the movements is vice versa. So FIRST move the X and Y axis, and THEN Z axis last. This proceeding is commonly used on professional CNC-machines. By approaching the tool from above the workpiece to a position, that procedure avoids possible collisions with the workpiece.
Instead the A350, when you push the “Go to Work-Origin” button, the Machine moves first Z axis and then, X and Y axis at once to work-origin. This had result to a collision of the tool with a collet in my special case, what could have been avoided, when Z axis whould have been the last.
This proceeding of the machine is reproducible when you toggle between work home and work origin.
So I’d like to adjure you, to change this behavior of the toolhead in the near future. I guess this leads to more happy users by not have to complain about tool crashes. 
Kind regards
micromikl
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It’s a shame no one has responded to this. I’ve only just started using the CNC module (after many years in the industrial CNC arena) and this is a real issue! and should be addressed.
I know we could move the X&Y axis to a ‘safe’ position before using ‘go to work origin’ but coming in the next morning to continue a batch, you turn on the machine, home the axis, press go to work origin and the Z axis dives down on top of the clamping which is no where near the work origin.
Does the button call a macro that can be edited? That would be a simple solution if the macro file could be accessed.
Regards
Mark
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@mmcevoy
Does the Z-axis move first even with the newer, latest firmware?
I am using Fusion360 to post CNC machining, and even when setting the home position, checking the boundary range, or moving the workpiece home position from the home axial, the XY moves first, then the Z axis moves.
When returning to home from any location, the Z axis is moved first.
Are you using a newer firmware?
Please check it.
Firmware was V1.10.1 just updated to V1.11.4 and the issue is fixed.
Well done and sorry for not checking firmware first. 
Mark
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Hi! When I hit the button “Go to work origin” on Luban it does the X and Y first and then Z, but when I hit it on the small touch screen from my A350 it does the Z first and last X and Y, the Z axis should be last so the bit doesn’t collision with the work piece!!! Is there a fix for that???
Also, is there a way to add a few more button options to JOG MODE TAB on the touch screen software, which are only in Luban? Please include “X/Y” cero out button and a type-in customizable distance option as well, not only limiting to 0.1mm/1mm/10mm? These to options are very handy, but are only available on Luban, when you are already on the machine it’s a drag to do it manually!!!
Thank you and please help!