Abstract: A column mount is provided which is particularly useful in a machine tool capable of being assembled to perform either horizontal or vertical machining operations. The mount includes an adjustably movable support member for reciprocating a tool bit head assembly over a given length along a column, the column extending vertically from the machining tool when performing vertical machining operations. The mount operates to allow the head assembly support member to be adjustably reciprocated from a selected starting position on the column above a workpiece, and enables the support member to be readily moved along the column to the desired position.