How to get back exact coord position after tool change if you MOVED router head !!!!

[KKWinMyanmar]

Dear all,
Just completed rough cut for 3.5 hours and needed to change tool bit.
Brought motor to front -Y axis, +Z axis to get headroom to change tool bit, then my square head without thinking went and X,Y set to zeroed
Don't know what happened to me, just plain stupidity, I can just simple load file for finishing Gcode and start running.

Now I will lost my whole evening works!!
I tried my best to get back aligned:
Set motor to approximate home position and Zeroed X,Y and Z.
Then run a few lines of roughing cut, stopped and compared Gcode XYZ value and Mach3 DRO value, then adjust the differences on X Y and Z.

Well, it didn't turn out as I hoped, For X Y seems close enough but Z was wrong, in short I ruined the my very first project of lovely Chinese dragon.

Just curious, is there anyone with this sort of experience?

Thanks and brgds
Win

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[minichopper6hp]

I always home first then write down my coordinates before I zero the starting x and y position

[KKWinMyanmar]

Hi minichopper6hp,
Thanks, after that mistake, I did carved a few more cuttings.
As long as I don't zero X and Y , its no problem, same project rough/finish/cut-out files will always correct.
For Z, its easy to adjust back to zero starting height.
Thanks and brgds
Win