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Barrel youtube clip

Unless you have the image enhancer from the movie super troopers its unlikely you can tell the graduations of the gauge from the video. A good guess would be 1/2 thou graduations.

Also, it's unclear if we're seeing run out from a loopy barrel or because it wasn't chucked properly in the lathe.

Indeterminent.
 
Assuming in indicator rod is dialed in to .000" it means that the od is not concentric with the bore by .0005" which is very very good.

I don't know if he's bragging or complaining but this measurement is pretty much irrelevant to accuracy. Probably a rookie.
 
Putting the indicator tip on the od and then indicating the od to zero run out then check your bore to the od. All hes showing is that he got the od of the barrel indicated in within 5 tenths or .0005.
 
What interests me a lot more is how concentric it is about 2.5" down the bore. But like DC said, it doesn't have anything to do with how accurate the barrel might be...
 

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