Help newbie with coordinate system.

Dear friends, I have a new hobby CNC using linuxcnc. I'm starting to mill aluminum parts and of course my machine is very slow to do the jobs. Kress spindle, Nema 17...i spent a lot of time on it.

The machine have home switch and limits (the same for both). When I shut down the machine, if I do not want to lose work zero of piece (in my case, normally is in the center of the piece) when I shut down the machine. For now to me because I do not have edge finders, etc I'm having problems to make pieces because I have errors setting the work zero between jobs in the same piece but in differents days.

Is there any form to maintain or come back to the same work zero? Each time I restart the machine, I need to rehoming and I lose the zero points of 3 axis.

Also I want to know if I can use absolute coordinate to go zero machine and then go to the work zero knowing the machine coordinates of zero work piece before I shut down.

Thanks a lot.

Thanks tommy for the fast answer!

I have a questions about the file.

It save the home switch positions, etc? Or i need to re home axis also??

If it is only for a some works, I need to modify the I I file to erase the positions??

Thanks!

Hello!

The form I have learned is after I power on the machine is to home the machine then touch of the center of the piece and set to zero the G0 code. The problem is that the coordinate reset to 0 and it is difficult to set back to the same center I need to set again the work zero.

I do not know if when I home the machine, the absolute coordinates ? Set to zero? And if I write the G53 coordinates in a notepad, when I set the zero pice in G0 and restart the machine, can I come back manually to zero piece with the same G53 coordinates I wrote in notepad and it will be in the same position than before?

or another form is t play with g53 and g54 codes setting them to zero initially an write the values of g54 that are the same position as before ?

Thanks