Numerically Controlled Knee-Type Milling Machines for Metal Removal

A knee-type milling machine has a vertically adjustable knee casting that supports the saddle and table, allowing the operator to raise or lower the entire workpiece assembly relative to the spindle. This distinguishes it from bed-type or planer-type mills, where the table travels on a fixed base. Manufacturer drawings or technical datasheets confirming the knee mechanism are the standard supporting documentation for this classification.

For HTS purposes, 'numerically controlled' means the machine's axis movements are directed by a programmed numerical controller — even a basic two-axis NC system qualifies. Machines with only a digital readout (DRO) that provides position feedback without controlling axis motion are not considered numerically controlled and would fall under the non-NC subheading (845959). The controller's function, not its sophistication, determines classification.