Key Features and Requirements of Spindle and Bearing for High Precision Machine Tools? ...
Answers: What about them?
Usually, lofty precision machine tools are a bit beyond DIY projects.
If you are trying to build your own tool, you call for to look at how well on the brink the spindle is. A larger diameter will result in smaller amount wobble. The better bearings you procure, the less wear and wobble you'll take.
You could also consider hydrostatic bearings, but again, that's not a DIY project.
If you're repairing a electrical device, get the specs of what be in nearby to start with, unless what you're trying to do is amend the specifications.
That's DEEP