The vertical alignment with the spindle means that metal chips can accumulate on the surface in the workpiece and have to be cleared. An HMC generally comprises an automated pallet changer (APC) system with 6 to eight pallets, which allows steady work on distinct parts without the need of handbook https://www.sedlacek-t.cz/obrabeci-centrum-haas-ec-400-spolehlivost-a-presnost-pro-vas-provoz/