Okuma Alarm-B 2654 Hob circular cutting command

Okuma Alarm-B 2654 Hob circular cutting command
In the arc hob cutting commands, the designated arc either is in contact with or intersects the line (called the center line) passing the center of the arc and in parallel with the Z-axis.

Object
SYSTEM

Code
1->The start point of the arc cutting is on the center line.
2->The end point of the arc cutting is on the center line.
3->The end and the start points lie in the opposite side in reference with the center line.
4->The tool advancing direction is different from the commanded cutting direction (for the arc having shorter arc length between the start and end points.

Probable Faulty Locations
Program error
Program Example:

M556 O1 RC=82 HA=20 MN=3.5 F1
M13 SB=1000
G00 X100 Z100
G02 X120 Z110 I10 K0
M12
M555
End point is on the center line.