Hi fabrice,
the auto zero bueeon and probe slider are actually for zeroing the part (maybe I used the wrong name)
I have a fixed zero touch plate installed in my machine, and I do manual tool change.
So when I put the first tool, I use the probe slider to zero it. When it is ready where i want it to be, I press the "initial tool offset" button and the tool travels to the fixed plate and measures.
Then each time I change a tool, I dont have to worry for the z zero. I just put it and press the auto zero button. The tool travels to the fixed plate and measures, and addapts the z zero according to the first tool.
1) Put first tool.
2) Set X,Y,Z manually or with the probe slider
3) Press the "initial tool measure" button to measure the tool against fixed plate
4) Run program
5) When toolchange is requested, change tool manually and press auto zero.
Hope that clarifies. I will correct the slider problem you reported
regards