I'm having a brain fart and it hasn't resolved itself in a few hours...

I'm setting up to bore & thread a section of 1.5" Ti tubing I cut off a longer section I've used in the past.


Fo some reason I can't get this 7" section to dial in.


I've got it down to +/- 0.0005" at the chuck, but at the end of the 3.5ish inches hanging out, I'm looking at +/-0.014 of runout...


Pointers please!


The older gentleman I used to ask these questions to, passed away this year finally from Parkinson disease. You don't realize all the small ways you miss someone who you known since your childhood...

Is the tubing bent?

Added: you're using a 4 jaw chuck?

@CNC_guy
Using a 4-jaw chuck.

Turns out it IS bent.  Laying it on a ground surface, I can see daylight in places.  

Bent like a banana.  Dammit