I needed to enter G53 G0 Z0 to move in machine coordinate system
2. Machine Coordinate System
Regardless of any offsets that may be in effect, putting a G53 in a block of code tells the interpreter to go to the real or absolute axis positions commanded in the block and ignore any offsets in effect. In the following example the machine will move to the machine coordinates set when the axes were homed and will ignore any coordianate system and global offsets in effect.
G53 G0 X0 Y0 Z0
G53 is not a modal command. It must be used on each line where motion based upon absolute machine position is desired.
linuxcnc.org/docs/html/gcode/coordinates.html
Which way should a positive jog move the milling machine head? Up?
After you touch off say in G54 at the top of the work piece at 0 then a positive move in the G54 coordinate system or a positive jog will move Z up and away from the work.
Rick G
