Even though the process isn't related to any absolute measurements and just relative movement, using the Noga meant that there was never any consistency as the stylus isn't held perfectly parallel to the spindle axis. I had a lightbulb moment (for me, anyway) and took a short piece of round stock, drilled a hole for a slip-fit for the Interapid stem along with another for a set screw to lock it in place. Stick it the toolholder, set the appropriate height and go from there.
Now, when I dial the throat and just ahead of the breech, I can work towards an actual "zero" which is the same at each end as I slide it in/out with the carriage. Probably won't matter to anyone else here, but I find working with the same numbers on the dial makes it easier for me. Can't do that when holding it with the Noga as the stylus will never be parallel to the spindle axis and it's going to ride at a different location on the "clock" depending on it's locating on the z-axis.
Now, when I dial the throat and just ahead of the breech, I can work towards an actual "zero" which is the same at each end as I slide it in/out with the carriage. Probably won't matter to anyone else here, but I find working with the same numbers on the dial makes it easier for me. Can't do that when holding it with the Noga as the stylus will never be parallel to the spindle axis and it's going to ride at a different location on the "clock" depending on it's locating on the z-axis.