How to make a tool changer move to home

Ok let's just go ahead and try to implement the solution by user MaHA in edit3.

So do this:

1) in your config open folder "remap_subs" and create a new file named "last_tool.ngc" with this in it:

2) in your INI file after the [HAL] section add these two lines:
3) in your .hal file add:
4) change your toolchange.ngc in the folder "remap_subs" to this (add second to last line):
Explanation:
The line "o<last_tool> call" in the toolchange remap should call the last_tool.ngc file and that should create a file named 714.ngc in your remap_subs folder with a complete subroutine that will tell linuxcnc to change the tool to the current toolnumber without actually moving the toolchanger. This subroutine will be run the next time you home your machine and should thus change the active tool to the toolnumber called up in the last toolchange.

I hope this makes sense. I'm not sure if the file 714.ngc will actually be created in your "remap_subs" folder or in your config folder so we might need to tweak that a bit. Anyway give it a try.

Hm, that pin should exist. Can you comment that line out and look for it in Hal show after linuxcnc has started?
Maybe delete the line and retype manually.

[edit]
that is the pin that should go true once the X axis is homed and that is when we want the script to run setting the tool number to the last loaded tool

Hm, ok so let's use that pin then:


[edit]
What version of linuxcnc are you running?

Well there we go again. I'm puzzled as to why your system is missing all the halui pins.

[edit]

Maybe add this to your .ini in the [HAL] section

Ok let's try:

Note that there will be no script written until the first real toolchange. After the first tool change with motion on the ATC there should be a file named 714.ngc and after that you should get the tool number set after homing the machine.

[edit]
Ah and you will need to create an empty file named 714.ngc in the "remap_subs" folder otherwise it will throw an error the first time because there is no file to run.