What is a Horizontal Milling Machine? (with ... - wiseGEEK
May 21, 2020· M. McGee Last Modified Date: July 12, 2020 . A horizontal milling machine is one of the two basic styles of milling equipment. These machines specialize in a process called arbor milling, which involves the rapid removal of material from a source object.These machines were the original milling machine style, with vertical milling only coming into prominence many years later.