The Milling Machine - 4: Mill Construction
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WARNING: Machine tools present a safety hazard. Improper operation can result in severe injury. These topics are for non-laboratory study only and are not to be used in conjunction with the operation of any tool or machine described herein. Never use a machine tool without the supervision of a qualified instructor.
There are two basic construction types of milling machines: the column and knee machines (figure 1) and the fixed bed machines (figure 2). As the name indicates the column and knee mills have a knee attached to the column which is elevated by a jack screw.

The fixed bed construction (found in most CNC machines) does not have a knee. Only the spindle can change elevations. This a more rigid machine than the column and knee configuration.
Figure 2
Figure 1
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