At one particular close with the bed (nearly always the left, as the operator faces the lathe) is a headstock. The headstock incorporates large-precision spinning bearings. Rotating in the bearings is a horizontal axle, using an axis parallel for the mattress, called the spindle. Spindles in many cases are hollow https://www.sedlacek-t.cz/nabizime-k-prodeji-cnc-soustruh-tornos-evo-deco-32-10/