Howdy Tubal-cain, again. You know, one of the perennial problems of a lathe operator, our machinist, is to keep his tails in alignment. So today, we're going to show you a little bit different way than what I've shown you before on how to do that. We're going to make a test bar, similar to this. This is a page out of the South Bend "How to Run a Lathe" book. Shown here is a bar between centers with enlarged parts here that could be put between centers and turned down, and then miked on each end to compare the two and adjustments made until the diameters of the two are the same. Now, I don't know why they're showing calipers on there instead of the micrometer because that's not the way we're going to do it at all. That just isn't accurate enough. This is the text from below the picture that I just showed you in the last scene, so if you want to read that, pause your video and read through those two paragraphs. Some of you may have a test bar, and a test bar would be a 10-inch piece of 1-inch stock that is hardened and ground and tested to be perfectly concentric and the dimension the same on both ends. This is just a piece of cold rolled steel, and this is what we're going to use, but this isn't nearly accurate enough. Now, you could, in fact, I've got center holes drilled in there already in both ends, you could, in fact, put this between the centers and turn the whole thing down and compare the measurements, or a smaller, shorter bar, but that would be impractical. We're going to do it more like the picture I just showed you in the book. Again, this...
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