Work with probe

Here is my post that contains the details of what I did and how it works.
Detailed post

Basically the of my spindle is tool length zero.   I record the position of the spindle nose on the tool setter.  All tool lengths are calculated from that point to where the spindle nose is when a tool is touching the tool setter.  I also measured the effective length of the 3D probe and recorded that value so that when I touch off on a piece of stock the math can be done to know the position where the tool will touch the stock top.

John

Hi John!

Thank you for your work! I like your workflow. Where can your files be found?

I might be bit dumb to be honest, my brain is still not lined up.
trouble I see is that the tools don't really sit in the spindle cone in exactly the same height from the spindle some tool holders I have might have been reground and they sit slightly in (my guess why they sit different) so I don't have any exact reference point/ height on tool holders from the spindle, one of them being the tool holder for the 3d probe.
One way would be to make a cone to sit the toolholder in and take reference from that  cone since they all would sit in that cone the same but different from the actual spindle.
That is why I thought the easiest way would be to touch of the 3d probe on the tool setter but how do I know which input actually triggered the touch? I am not sure if I am explaining my self well.
Here is a quick sketch of what the problem I have is The dimension on the left is not really reliable and that is the main problem I don't understand. It is a cutaway of my exact spindle with toolholder in it.
 
 

True your tool holders taper diameters might not be terribly consistent from one tool holder to the next. But the point is that once inserted each tool holder should insert the same amount each time. It doesn't really matter that tool holder #1 is a different length than tool holder #2. It only matters that tool holder #1 inserts the same every time it is used. Even if you are using a measuring stand to measure tool offsets off of the machine. if tool number 2 inserts a 1/4" shallower than tool #1. The offsets measured at the stand would still be 1/4" different between tool #1 and #2 at the tool stand same as in the spindle.

PS: This is a problem with most ISO taper tools, and there is some inconsistency inherent to it especially when dirt contamination, high loads, high speeds, or high temperatures get involved.  If it bothers you that much sell your machine and buy a newer one that uses HSK tool holders.

That is exactly right but the problem I am still having is how do I get exact Z offset for the 3d probe.
Tools are obvious I will touch them off on the tool setter and I don't care if there are differences between tool holders as long as the tip of the tool get touched off on the setter.

I still can not get the 3d probe in my head. I can not touch it off on the tool setter since I would not know if 3d tripped it or tool setter tripped it, since they go into the same input.
I can not measure it since I don't have the reference height from ,well, anything fixed on the machine.

I don't feel I am relaying the problem well enough or I am not absorbing the solution well enough.

I don't know for sure, but I wonder if he sets the 3d probe as a tool number and sets a Z offset for it. That offset would be set at the table surface (the same surface the tool setter is referenced from) then your 3dprobe is relative to the toolsetter.