Tool Length Offset setup question

Hi all

I'm having a a question how people setup the following:
My mill uses BT30 holders so no issues with changing ER collets and each time a different length.
I've setup a working probe and try to fill in the length offsets in the tool table.
I use a haimer 3d taster to find zero on workpieces

So what I'm doing:
> Start lcnc and home the machine. Load a tool.
> run my probe script
> once the tool hits the probe and stops I manually go to the tool table. And I click Touch off Z with 0 parameter
> I repeat this for all the following tools
> When I prepare a workpiece in my vise I zero it with my haimer 3d taster
> And all tool offsets are fine

But....

If I want to add a new tool, the length is completely different because I set zero on the workpiece and the relative coordinates change. So also the z offset of my tool

So I have a table like this
Tool 1: -210
Tool 2: -100
Tool 3: -160
Tool 4 (the new tool after I set 0 on workpiece): 8.5
Tool 5: - 175

How should this be done? I'm forgetting something?

What I mean is, is it possible to set the tool lengths offsets in absolute values instead of relative? Because if I set them in relative values and I want to add/change tool lengths the offset is wrong, because the reference point will change with the 0 of my workpiece. I have to load the reference first and zero my probe. And after this I'm able to add/change tool lengths with the right offset. But after this I have to re-zero my workpiece again.

Edit

'solved' it using this method: forum.linuxcnc.org/21-axis/2653-tool-length-offsets-in-emc
But I'm curious if there is any other option to do it

Hi John,
Thanks for the reply

Yes that works. But if I need to add new tools I always have to set 0 to the same place where I first measured the tools.

For example
I use a probe at a fixed location, I touch off all my tools.
I zero my workpiece...machining...machining...oh I need to swap to a tool that's not in the table.
If I want to have the right offsets in my table, I first have to load a reference tool. Zero the location where I first set zero during the touch off. Load the tool that's not in the table and touch off the new tool. After this I need to re-zero the workpiece that I was machining.

I now made a macro with the above g code and some changes.
That switches to 59.3 with values set same as absolute.
Goes to G30 (above toolsetter location) -> probes -> saves offset in table for the current tool -> goes back to g30 and switches back to g54.
This way I don't have to re-zero my workpiece and I don't need a reference tool to set 0 for touch off.