X geometry in fanuc series O-TT control

[cuz1007]

how do I set x geometry for a fixed drill pass with the fanuc series O-TT control, here is the drill pass.
%
O1002(SUB 1-1/2 CR0SS)
G50S800(MAX SPEED)
T0505(Fixed Drill 1.5625)
G96S400M3
G0G54X0.0M8
Z0.500
G1Z-2.00F0.005
G0Z8.0
X12.0M9
G28 U0 W0
T0500
M01
M99
%

On the Fanuc Series 16 and 18 control The x geometry for tool 5 would be 0 for a fixed drill but thats not the case with the series O. how can i find the x value of the center line on the chuck?? I was thinking to put the fixed drill on the center of workpiece and type in mx0.0? would this work? and how do I know i'm directly in the center of workpiece??? any help would make my life easier!! thanks

[jimmytightpants]

I dont know how to program the zero but you can stick a dial indicator on yur chuck and run it around your drill to find the center. if what you programmed isnt on center, keep trying and testing with the indicator till you get it. i posted the picture to show the indicator ignore the rest.