hi
I want to build a cnc machine that restore aluminium wheels and do the polish operation , so my plan is using mach3 to control the machine ,

for the wiring , and calibration of axis i have no problems BUT i have a little problem

i do not know how to restore the DRO from the wheel that i will have to work on : ( i will put an attachements so you can see what am talking about )

https://www.youtube.com/watch?v=fHkyWlnZtQM&t=1s

i have seen a lot of video on youtube , i thinks they use the method of probing and mach3 restore those DRO then they offset them for exemple by 0,5 mm and they start work on the wheel ,

for my case i don't know how to

if anyone can help
thanks in advance