Geeetech

hi, i have changed to 196 mm mi axis eight home works g29 works buts onlo do the first hit in the bed after that star climbing and finish between z and x axis i have all modified except the // these are the offsets to the probe relative to the extruder tip (Hotend - Probe)
#define X_PROBE_OFFSET_FROM_EXTRUDER 20.35
#define Y_PROBE_OFFSET_FROM_EXTRUDER -11.75
#define Z_PROBE_OFFSET_FROM_EXTRUDER -1.2
just dont understand how to measures this for mi eight axis i make a probe print and it starts printing in the air and seems he is doing the print vertically!! just lost please suggestion?? almost read all the post of g2.....

Before you start G29, did you do the 3 steps? Only you finished them can the G29 working!
1) Define the final Z axis height;
2)Check the status of endstop;
3)Define the Z_PROBE_OFFSET:Put down the prob. Manualy move the print head down slowly, place the probe at the center of the print bed. When you hear the trigger of the endstop, you can get the coordinate on the Repetier host ,it is 【-20.35,11.75,0.3】