Abstract: A vacuum holddown device for retaining a workpiece at a desired machining location on a horizontal work support surface, including a plurality of cylindrical actuators arranged in cavities contained in the upper surface of the work support. E ach of the actuators includes a vertically displaceable sensor member having a rounded surface that protrudes upwardly above the upper work support surface for engagement by the workpiece. When the sensor is depressed by the workpiece, a vacuum chamber in the actuator applies suction to the workpiece to maintain the same in the machining location. The actuators are selectively operable between flush and elevated positions relative to the work support. Attachment members may be selectively connected with the cylindrical actuators.