Hi, robksawyer
It's been mentioned above - you need to change hal_manualtoolchange file (located at /usr/bin)
it's a Python script LinuxCNC calls when M6 command is issued.
My owm machine uses new hal_manualtoolchange (see attach) - it's a bit buggy with LinuxCNC 2.7 but works.
Your G53 question is pretty simple - you may add any code prior to toolchange in your postprocessor, or manually.
Just an example: raise Z, then move to
machine coordinates X10 Y200. Do toolchange. Raise Z again to safe top.
Code:
... your actual milling code
G0 G53 Z100
G0 G53 X10 Y200
M6 T5
G0 G53 Z100
... your actual milling code
