at this precision? Very, very carefully. The chuck, the part that holds the workpiece on the shaft, has two runout adjustment screws that can move the workpie

at this precision? Very, very carefully. The chuck, the part that holds the workpiece on the shaft, has two runout adjustment screws that can move the workpiece in the x and y relative to the shaft. In order to get micron level precision, you have to adjust those screw fractions of a turn, and the screws have to be on a very tight preload. This is a very unusual design for a chuck. The overwhelming majority of chucks follow two (or 3-4) designs.