A vertical-horizontal could be very useful. The vertical mills are most common. Horizontal mills are used frequently for cutting spiral gears, gang milling, and are great when your milling task requires that the milling cutter be supported at both ends (horizontal mills have the milling cutter mounted on a horizontal arbor that is mounted at both ends).
The vertical-horizontal mill usually has the motor and milling head mounted on a turret that is rotated to select either vertical or horizontal operation.
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