This is because the machine can work to 4/5 different angles/axes to achieve the final shape, rather than two or three that operate on just X and Y.
Nke a bụ n'ihi na igwe nwere ike rụọ ọrụ na 4/5 akụkụ/axes dị iche iche iji nweta ụdị ikpeazụ, kama abụọ ma ọ bụ atọ na -arụ ọrụ naanị X na Y.