The saddle enables the side to side (X-axis) as well as the in and out (Y-axis) motion of the milling machine. It is the intermediate component between the table and the knee.
Saddle Traverse Locks
The saddle traverse locks hold the saddle in position. They lock out movement in the Y axis.
Table Traverse Locks
The table traverse locks prevent the table from moving left and right. They lock out movement in the X axis.