This talk covers our experiences in testing large, air-bearing spindles we build for a manufacturer of ultra-precision, diamond-turning lathes. Specifically I will talk about how our testing evolved as our customer's requirements became ever more stringent. Making the spindle wasn't a giant technical leap for us but testing it turned out to be more difficult. Our whole toolbox of spindle testing equipment was not up to the task and new tools had to be built from the ground up for the testing of these specific spindles. I'll be going through a few of our tries at testing and will conclude with a look at future plans for using error separation techniques at high speeds that should allow us to get the last few nanometers of measurement error out of our tests.
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