Saving machine settings between sessions

[Wal]

but will need to note machine/work offsets and current gcode line number.

Not necessarily - Linux CNC remembers the last used G54 offset (provided your machine shut down ok), so you'll only need to re-zero the machine coordinates, G54 will still be stored. Very handy...

Regarding leaving machines unattended - I wouldn't. You can build it as well as you like, but nothing can account for the unexpected! Call me paranoid...

Wal.

[JAZZCNC]

If you don't have good Home switches then the next best thing is to run the machine into some hard stops and call this machine Zero. Then from this you can accurately get back to any point on the machine and equally find any point in G-code by using the run from here in Mach3.

Working from a hole or mark on the machine isn't accurate enough IMO and the only sure way is thru either repeatabile home switches or pyhsical hard stops.