... or the obsessions of a madman.
In this thread, we decided I would check the runout of my new Enco keyless chuck. On the 2nd page a setup was suggested by gentleman Nateg281.
While I was all setup to do it, I measured all the drill chucks I could find that weren't mounted to a hand drill or DP. The results are in!
The setup, I first eyeballed, then indicated, the DTI'd my "test bar" a rotor shaft for a 30K RPM mixer. I figured that would be pretty straight! Measuring at each jaw of the 4 jaw, I got it well under the half thou resolution of the DTI, eyeballed at about 1/4 thou. I got the same running the lathe at a few rpms or turning it by hand. Unfortunately, I didn't notice the autofocus gods were not smiling, and it's not focused on the dial. I first dialed in the chuck at the end of the rod, then moved in and verified the readings were the same. Until the last couple of tests, I rechecked the runout of the test bar after every chuck.