At a single end from the bed (nearly always the left, as the operator faces the lathe) is a headstock. The headstock contains higher-precision spinning bearings. Rotating in the bearings is really a horizontal axle, with an axis parallel for the mattress, known as the spindle. Spindles are sometimes hollow https://www.sedlacek-t.cz/nabizime-k-prodeji-cnc-soustruh-tornos-evo-deco-32-10/