Bridgeport spindle runout - drawbar effect ?

[crickets]

Folks,

I had my Bridgeport spindle bearings professionally replaced, and R8 taper reground. Dropped the spindle back into the machine - too much runout. Took the head apart to get the quill out and back to the spindle shop - nothing, no visible runout. Put it back into my machine - back to the same excessive runout... I tried different indicators, different R8 tooling to use as a reference. And yes, taper itself seems to have minimal runout, at least within my ability to measure.

So that brings us to the question - can a crooked drawbar affect how well R8 tooling is seated ?

 

[Billtodd]

Simple answer, yes. The upper part of the r8 collet has to be a sliding fit so cannot exactly centre the top of the collet, if the drawbar is bent or pulling to on side , it will effect the runout.

Another cause is the antirotation pin , if too long or burred, it'll push the collet to one side.

 

[crickets]

Yeah, that pin (or rather screw) I've backed out substantially during measurements, so pretty certain it's not the issue. But cool, sounds like I should try another draw bar.