A full view of a Bridgeport Series 1 Knee Mill. The head is mounted on the ram by joints that allow it to swivel in two directions. The ram can slide back and forth on the turret, which can swivel on the column. The table sits on the knee, and it can move horizontally in the X and Y axes. The knee rides up and down the column (one form of Z-axis movement), and the head contains a quill in which the spindle can slide up and down (another form of Z-axis movement or, when the head is swiveled, an additional axis).The Bridgeport logo as cast into the head of a Bridgeport Knee Mill.The patented "2J" head ensures that any heat buildup in the spindle bearings, belt, or quill area is kept to an absolute minimum. This results in increased belt and bearing life as well as consistent accuracy with no external cooling fans required, increasing rigidity and vibration dampening properties.
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