The knee is the casting that supports the table and the
saddle. The feed change gearing is enclosed within the knee. It is
supported and can be adjusted by the elevating screw. The knee is fastened
to the column by dovetail ways. The lever can be raised or lowered either
by hand or power feed. The hand feed is usually used to take the depth of
cut or to position the work, and the power feed to move the work during the
machining operation.