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4 - The Milling Machine - Mill Construction
There are two basic construction types of milling machines: the column and knee machines and the fixed bed machines. 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 large CNC machines) does not have a knee. The spindle can change positions. This a more rigid machine than the column and knee configuration.

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