[dingo0722]

I am trying to set the X zero set value relitive to a boring bar tool holder. How do I find the exact center of the holder relitive to the center axis of the spindle?

[RWACKO]

co-axial indicator in chuck and sweep in holder calculate zero in x make sure to write that x number down

[littlerob]

OR any indicator, I personally do not like Blakes Co-ax. Depending on the job you are doing absolute center isn't exactly critical. Sometimes I use a small drill run it up to the part and eyeball it. There are problems with that method though, for example if your turret is out of parallel, the tip of the drill is going to be different than the center of the holder. Also keep in mind that if it isn't on center and there is no good reason why not, they all may be off on the rotation of the turrret, so I like to indicate at least 2 holders in, 180° apart.

Robert