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G28 G-code
The G28 G-code can mean different things depending on whether you are using a CNC mill, or a 3D printer.
This is because when the Reprap project chose its G-codes, and what they are supposed to do, they completely ignored the existing G-code standard, and messed everything up.
Not our fault!
On a Reprap, the G28 G-code means “go to the endstops and stop moving when you have hit them”.
On a CNC mill (traditionally), the G28 G-code means “go to the recorded origin point for the machine”.
In the Smoothie firmware, if you set grbl_mode to true (and/or have the CNC build), it will have the “CNC mill” meaning, and if you set it to false (or do not set it at all), it will have the Reprap meaning. See grbl-mode.
To see information on the G28 G-code for CNC mills, see G28-cnc
To see information on the G28 G-code for Reprap machines, see G28-reprap