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Horizontal boring machine
A horizontal boring machine or horizontal boring mill is a machine tool which bores holes in a horizontal direction. There are three main types — table, planer and floor. The table type is the most common and, as it is the most versatile, it is also known as the universal type.
A horizontal boring machine has its work spindle parallel to the ground and work table. Typically there are 3 linear axes in which the tool head and part move. Convention dictates that the main axis that drives the part towards the work spindle is the Z axis, with a cross-traversing X axis and a vertically traversing Y axis. The work spindle is referred to as the C axis and, if a rotary table is incorporated, its centre line is the B axis.
Horizontal boring machines are often heavy-duty industrial machines used for roughing out large components but there are high-precision models too. Modern machines use advanced CNC control systems and techniques. Charles DeVlieg entered the Machine Tool Hall of Fame for his work upon a highly precise model which he called a JIGMIL. The accuracy of this machine convinced the USAF to accept John Parson's idea for numerically controlled machine tools.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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