Originally Posted by
Bob La Londe
If manually inserting a retract for safety I prefer to enter a G53 for absolute machine position rather than G00 which is in the current coordinate offset. The negative for using a G53 is that it moves at the last F speed, so its also good to add an F value. G53 Z0 F300. On some machines I used to use a G28 or a G30, but now I have multiple machines different setups. I actually prefer to modify my M30 macro on each machine to include a G53 Z0 F300 along with an extra M5 M9 just in case. G28 and G30 don't perform exactly the same on every control program. For one machine I rewrote the post processor to insert all kinds of safety and tool change position code. On others I did that in the tool change macros.