Z FLoating head for Plasma cutting (OX CNC compatible)

I will explain here how works the Z floating head that i use on my 2 plasma cutting table .
For more information , you can find full builds here :


.It's really easy to modify your good OX CNC to a plasma cutter , you just have to modify a little bit your Z axis .
What is the purpose of a floating head ? :
Just like on a classic cnc , you have to know your Z zero and it is the goal of the floating head .

Programmation of Z probing is done by the post processor ( i use sheetcam post processor ) .

My head goes done ( Z axis move ) , when torch is on the metal sheet the second carriage goes up until it hit the z probing limit switch . I know that the distance between the front of my torch and the limit switch is 7.75 mm , si now my z axis goes up 7.75mm and i have my Z zero.
I can also setup in my post processor to do a probing every time that my torch make a move longer than 20 cm ( example ) .



My post processor config :