Hey there one and all. Shop just got a Romi C420 with Sinumerik 828D control. I'm trying to thread using G92 but not working like it should. It approaches the work piece and does the first pass but then it retracts like it's trying to go to home position. Programming manual is of little help since it's in portuguese, just like the control board. Here's the program.
G53X Z
G40G21G54
G18
G0T0101
G97M03S500
G0X Z
G92X Z- F

and so on.

Any help would be greatly appricieated. Greetings from Mexico.